Describes the format of claims, with particular attention paid to the structure of claims to be sent to the Kenya Social Health Insurance Authority.

Describes the format of claims, with particular attention paid to the structure of claims to be sent to the Kenya Social Health Insurance Authority.

The Claim resource fulfills three information request requirements: Claim - a request for adjudication for reimbursement for products and/or services provided; Preauthorization - a request to authorize the future provision of products and/or services including an anticipated adjudication; and, Predetermination - a request for a non-bind adjudication of possible future products and/or services.

A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.

Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.

An Extension

A code representing kenya counties

Extension for Batch Identifier

The number associated with a claim within a Batch.

The date associated with the Batch.Batch Date

String will contain a reference value from the payer

Date when the offline check was done

Date when the offline check was done

The provider specific episode identifier.

Flag to identify that this claim is for a newborn

May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

A unique identifier assigned to this claim.

Allows claims to be distinguished and referenced.

The status of the resource instance.

This element is labeled as a modifier because the status contains codes that mark the resource as not currently valid.

A code specifying the state of the resource instance.

Need to track the status of the resource as 'draft' resources may undergo further edits while 'active' resources are immutable and may only have their status changed to 'cancelled'.

The category of claim, e.g. oral, pharmacy, vision, institutional, professional.

The majority of jurisdictions use: oral, pharmacy, vision, professional and institutional, or variants on those terms, as the general styles of claims. The valueset is extensible to accommodate other jurisdictional requirements.

The type or discipline-style of the claim.

Claim type determine the general sets of business rules applied for information requirements and adjudication.

A finer grained suite of claim type codes which may convey additional information such as Inpatient vs Outpatient and/or a specialty service.

This may contain the local bill type codes, for example the US UB-04 bill type code or the CMS bill type.

A more granular claim typecode.

Some jurisdictions need a finer grained claim type for routing and adjudication.

A code to indicate whether the nature of the request is: to request adjudication of products and services previously rendered; or requesting authorization and adjudication for provision in the future; or requesting the non-binding adjudication of the listed products and services which could be provided in the future.

The purpose of the Claim: predetermination, preauthorization, claim.

This element is required to understand the nature of the request for adjudication.

The party to whom the professional services and/or products have been supplied or are being considered and for whom actual or forecast reimbursement is sought.

The patient must be supplied to the insurer so that confirmation of coverage and service history may be considered as part of the authorization and/or adjudiction.

The period for which charges are being submitted.

Typically this would be today or in the past for a claim, and today or in the future for preauthorizations and predeterminations. Typically line item dates of service should fall within the billing period if one is specified.

A number jurisdictions required the submission of the billing period when submitting claims for example for hospital stays or long-term care.

The date this resource was created.

This field is independent of the date of creation of the resource as it may reflect the creation date of a source document prior to digitization. Typically for claims all services must be completed as of this date.

Need to record a timestamp for use by both the recipient and the issuer.

The Insurer who is target of the request.

The provider which is responsible for the claim, predetermination or preauthorization.

Typically this field would be 1..1 where this party is responsible for the claim but not necessarily professionally responsible for the provision of the individual products and services listed below.

The provider-required urgency of processing the request. Typical values include: stat, routine deferred.

If a claim processor is unable to complete the processing as per the priority then they should generate and error and not process the request.

The timeliness with which processing is required: stat, normal, deferred.

The provider may need to indicate their processing requirements so that the processor can indicate if they are unable to comply.

Other claims which are related to this claim such as prior submissions or claims for related services or for the same event.

For example, for the original treatment and follow-up exams.

For workplace or other accidents it is common to relate separate claims arising from the same event.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

Reference to a related claim.

For workplace or other accidents it is common to relate separate claims arising from the same event.

A code to convey how the claims are related.

For example, prior claim or umbrella.

Relationship of this claim to a related Claim.

Some insurers need a declaration of the type of relationship.

Prescription to support the dispensing of pharmacy, device or vision products.

Required to authorize the dispensing of controlled substances and devices.

Original prescription which has been superseded by this prescription to support the dispensing of pharmacy services, medications or products.

For example, a physician may prescribe a medication which the pharmacy determines is contraindicated, or for which the patient has an intolerance, and therefore issues a new prescription for an alternate medication which has the same therapeutic intent. The prescription from the pharmacy becomes the 'prescription' and that from the physician becomes the 'original prescription'.

Often required when a fulfiller varies what is fulfilled from that authorized on the original prescription.

The party to be reimbursed for cost of the products and services according to the terms of the policy.

Often providers agree to receive the benefits payable to reduce the near-term costs to the patient. The insurer may decline to pay the provider and choose to pay the subscriber instead.

The provider needs to specify who they wish to be reimbursed and the claims processor needs express who they will reimburse.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

Type of Party to be reimbursed: subscriber, provider, other.

A code for the party to be reimbursed.

Need to know who should receive payment with the most common situations being the Provider (assignment of benefits) or the Subscriber.

A reference to a referral resource.

The referral resource which lists the date, practitioner, reason and other supporting information.

Some insurers require proof of referral to pay for services or to pay specialist rates for services.

Facility where the services were provided.

Insurance adjudication can be dependant on where services were delivered.

The members of the team who provided the products and services.

Common to identify the responsible and supporting practitioners.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

A number to uniquely identify care team entries.

Necessary to maintain the order of the care team and provide a mechanism to link individuals to claim details.

Member of the team who provided the product or service.

Often a regulatory requirement to specify the responsible provider.

The lead, assisting or supervising practitioner and their discipline if a multidisciplinary team.

Role might not be required when there is only a single provider listed.

The role codes for the care team members.

When multiple parties are present it is required to distinguish the roles performed by each member.

The qualification of the practitioner which is applicable for this service.

Provider professional qualifications.

Need to specify which qualification a provider is delivering the product or service under.

Additional information codes regarding exceptions, special considerations, the condition, situation, prior or concurrent issues.

Often there are multiple jurisdiction specific valuesets which are required.

Typically these information codes are required to support the services rendered or the adjudication of the services rendered.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

A number to uniquely identify supporting information entries.

Necessary to maintain the order of the supporting information items and provide a mechanism to link to claim details.

The general class of the information supplied: information; exception; accident, employment; onset, etc.

This may contain a category for the local bill type codes.

The valuset used for additional information category codes.

Required to group or associate information items with common characteristics. For example: admission information or prior treatments.

System and code pertaining to the specific information regarding special conditions relating to the setting, treatment or patient for which care is sought.

The valuset used for additional information codes.

Required to identify the kind of additional information.

The date when or period to which this information refers.

The date when or period to which this information refers.

The date when or period to which this information refers.

Additional data or information such as resources, documents, images etc. including references to the data or the actual inclusion of the data.

Could be used to provide references to other resources, document. For example could contain a PDF in an Attachment of the Police Report for an Accident.

To convey the data content to be provided when the information is more than a simple code or period.

Additional data or information such as resources, documents, images etc. including references to the data or the actual inclusion of the data.

Could be used to provide references to other resources, document. For example could contain a PDF in an Attachment of the Police Report for an Accident.

To convey the data content to be provided when the information is more than a simple code or period.

Additional data or information such as resources, documents, images etc. including references to the data or the actual inclusion of the data.

Could be used to provide references to other resources, document. For example could contain a PDF in an Attachment of the Police Report for an Accident.

To convey the data content to be provided when the information is more than a simple code or period.

Additional data or information such as resources, documents, images etc. including references to the data or the actual inclusion of the data.

Could be used to provide references to other resources, document. For example could contain a PDF in an Attachment of the Police Report for an Accident.

To convey the data content to be provided when the information is more than a simple code or period.

Additional data or information such as resources, documents, images etc. including references to the data or the actual inclusion of the data.

Could be used to provide references to other resources, document. For example could contain a PDF in an Attachment of the Police Report for an Accident.

To convey the data content to be provided when the information is more than a simple code or period.

Additional data or information such as resources, documents, images etc. including references to the data or the actual inclusion of the data.

Could be used to provide references to other resources, document. For example could contain a PDF in an Attachment of the Police Report for an Accident.

To convey the data content to be provided when the information is more than a simple code or period.

Provides the reason in the situation where a reason code is required in addition to the content.

For example: the reason for the additional stay, or why a tooth is missing.

Reason codes for the missing teeth.

Needed when the supporting information has both a date and amount/value and requires explanation.

Information about diagnoses relevant to the claim items.

Required for the adjudication by provided context for the services and product listed.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

A number to uniquely identify diagnosis entries.

Diagnosis are presented in list order to their expected importance: primary, secondary, etc.

Necessary to maintain the order of the diagnosis items and provide a mechanism to link to claim details.

The nature of illness or problem in a coded form or as a reference to an external defined Condition.

Example ICD10 Diagnostic codes.

Provides health context for the evaluation of the products and/or services.

The nature of illness or problem in a coded form or as a reference to an external defined Condition.

Example ICD10 Diagnostic codes.

Provides health context for the evaluation of the products and/or services.

When the condition was observed or the relative ranking.

For example: admitting, primary, secondary, discharge.

The type of the diagnosis: admitting, principal, discharge.

Often required to capture a particular diagnosis, for example: primary or discharge.

Indication of whether the diagnosis was present on admission to a facility.

Present on admission.

Many systems need to understand for adjudication if the diagnosis was present a time of admission.

Financial instruments for reimbursement for the health care products and services specified on the claim.

All insurance coverages for the patient which may be applicable for reimbursement, of the products and services listed in the claim, are typically provided in the claim to allow insurers to confirm the ordering of the insurance coverages relative to local 'coordination of benefit' rules. One coverage (and only one) with 'focal=true' is to be used in the adjudication of this claim. Coverages appearing before the focal Coverage in the list, and where 'Coverage.subrogation=false', should provide a reference to the ClaimResponse containing the adjudication results of the prior claim.

At least one insurer is required for a claim to be a claim.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

A number to uniquely identify insurance entries and provide a sequence of coverages to convey coordination of benefit order.

To maintain order of the coverages.

A flag to indicate that this Coverage is to be used for adjudication of this claim when set to true.

A patient may (will) have multiple insurance policies which provide reimbursement for healthcare services and products. For example a person may also be covered by their spouse's policy and both appear in the list (and may be from the same insurer). This flag will be set to true for only one of the listed policies and that policy will be used for adjudicating this claim. Other claims would be created to request adjudication against the other listed policies.

To identify which coverage in the list is being used to adjudicate this claim.

Reference to the insurance card level information contained in the Coverage resource. The coverage issuing insurer will use these details to locate the patient's actual coverage within the insurer's information system.

Required to allow the adjudicator to locate the correct policy and history within their information system.

The result of the adjudication of the line items for the Coverage specified in this insurance.

Must not be specified when 'focal=true' for this insurance.

An insurer need the adjudication results from prior insurers to determine the outstanding balance remaining by item for the items in the curent claim.

Details of an accident which resulted in injuries which required the products and services listed in the claim.

When healthcare products and services are accident related, benefits may be payable under accident provisions of policies, such as automotive, etc before they are payable under normal health insurance.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

Date of an accident event related to the products and services contained in the claim.

The date of the accident has to precede the dates of the products and services but within a reasonable timeframe.

Required for audit purposes and adjudication.

The type or context of the accident event for the purposes of selection of potential insurance coverages and determination of coordination between insurers.

Type of accident: work place, auto, etc.

Coverage may be dependant on the type of accident.

The physical location of the accident event.

Required for audit purposes and determination of applicable insurance liability.

The physical location of the accident event.

Required for audit purposes and determination of applicable insurance liability.

A claim line. Either a simple product or service or a 'group' of details which can each be a simple items or groups of sub-details.

The items to be processed for adjudication.

An Extension

A package billing code or bundle code used to group products and services to a particular health condition.

The amount of Tax (VAT) levied on the line item.

Refer to the expected payer share amount (to be paid)

The number of the patient invoice on which the service was billed.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

A number to uniquely identify item entries.

Necessary to provide a mechanism to link to items from within the claim and within the adjudication details of the ClaimResponse.

CareTeam members related to this service or product.

Need to identify the individuals and their roles in the provision of the product or service.

Diagnosis applicable for this service or product.

Need to related the product or service to the associated diagnoses.

Exceptions, special conditions and supporting information applicable for this service or product.

Need to reference the supporting information items that relate directly to this product or service.

When the value is a group code then this item collects a set of related claim details, otherwise this contains the product, service, drug or other billing code for the item.

If this is an actual service or product line, i.e. not a Group, then use code to indicate the Professional Service or Product supplied (e.g. CTP, HCPCS, USCLS, ICD10, NCPDP, DIN, RxNorm, ACHI, CCI). If a grouping item then use a group code to indicate the type of thing being grouped e.g. 'glasses' or 'compound'.

Allowable service and product codes.

Necessary to state what was provided or done.

The date or dates when the service or product was supplied, performed or completed.

Needed to determine whether the service or product was provided during the term of the insurance coverage.

The date or dates when the service or product was supplied, performed or completed.

Needed to determine whether the service or product was provided during the term of the insurance coverage.

The date or dates when the service or product was supplied, performed or completed.

Needed to determine whether the service or product was provided during the term of the insurance coverage.

The number of repetitions of a service or product.

Required when the product or service code does not convey the quantity provided.

If the item is not a group then this is the fee for the product or service, otherwise this is the total of the fees for the details of the group.

The amount charged to the patient by the provider for a single unit.

A real number that represents a multiplier used in determining the overall value of services delivered and/or goods received. The concept of a Factor allows for a discount or surcharge multiplier to be applied to a monetary amount.

To show a 10% senior's discount, the value entered is: 0.90 (1.00 - 0.10).

When discounts are provided to a patient (example: Senior's discount) then this must be documented for adjudication.

The quantity times the unit price for an additional service or product or charge.

For example, the formula: quantity * unitPrice * factor = net. Quantity and factor are assumed to be 1 if not supplied.

Provides the total amount claimed for the group (if a grouper) or the line item.

Unique Device Identifiers associated with this line item.

The UDI code allows the insurer to obtain device level information on the product supplied.

Physical service site on the patient (limb, tooth, etc.).

For example: Providing a tooth code, allows an insurer to identify a provider performing a filling on a tooth that was previously removed.

The code for the teeth, quadrant, sextant and arch.

Allows insurer to validate specific procedures.

A region or surface of the bodySite, e.g. limb region or tooth surface(s).

The code for the tooth surface and surface combinations.

Allows insurer to validate specific procedures.

A claim detail line. Either a simple (a product or service) or a 'group' of sub-details which are simple items.

The items to be processed for adjudication.

An Extension

The amount of Tax (VAT) levied on the line item.

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.