# NDH Code Systems - National Directory of Healthcare Providers & Services (NDH) Implementation Guide v2.0.0-current

## NDH Code Systems

NDH uses standardized code systems wherever possible to ensure interoperability and consistency across healthcare data. When standardized codes are unavailable, a code systems is defined within the NDH:

[FaCeT Credential Code System](CodeSystem-FaCeT-credentialCS.md)

This code system defines FaCeT practitioner credential concepts and associated properties used to publish normalized credential abbreviations, definitions, issuing-organization context, and classification attributes.

[CodeSystem properties for FaCeT Practitioner Credentials](CodeSystem-FaCeT-credentialPropertiesCS.md)

This code system defines metadata property codes for FaCeT practitioner credentials, including credentialing organization, source URL, descriptive text, and boolean indicators for multisource, clinical, and board-certification status.

[FaCeT Organizational Credential Code System](CodeSystem-FaCeT-org-credentialCS.md)

This code system defines FaCeT organizational credential concepts and associated properties used to publish normalized organizational accreditation and certification identifiers with issuer and lifecycle metadata.

[CodeSystem properties for FaCeT Organizational Credential](CodeSystem-FaCeT-org-credentialPropertiesCS.md)

This code system defines metadata property codes for FaCeT organizational credentials, including credential category, issuer details, credential type, credential URL, retirement status, and CMS deeming-recognition indicator.

[NDH Age Range Code System](CodeSystem-NdhAgeGroupCS.md)

This code system defines normalized NDH age-group categories used to represent age-range eligibility or targeting criteria in a consistent, computable format across directory content.

[NDH Associated Servers Type Code System](CodeSystem-NdhAssociatedServersTypeCS.md)

This code system defines NDH associated-server type concepts used to characterize supporting or companion server roles linked to a published endpoint.

[NDH Direct Trust Endpoint Usecase Code System](CodeSystem-NdhDirectTrustEndpointUsecaseCS.md)

This code system defines NDH Direct Trust endpoint use-case concepts covering exchange participants, business workflows, and operational communication patterns to support precise endpoint-purpose declaration.

[Endpoint Access Control Mechanism Code System](CodeSystem-NdhEndpointAccessControlMechanismCS.md)

This code system defines endpoint access-control mechanism concepts for NDH exchange, enabling consistent declaration of authentication and authorization approaches used to protect endpoint access.

[Endpoint Connection Types (additional) Code System](CodeSystem-NdhEndpointConnectionTypeCS.md)

This code system provides NDH-specific supplemental endpoint connection-type codes that extend the core HL7 endpoint-connection-type code system when additional connection semantics are needed.

[NDH Endpoint Environment Code System](CodeSystem-NdhEndpointEnvironmentCS.md)

This code system defines endpoint environment classifications for NDH publication, enabling consistent differentiation of production, staging, development, test, and training endpoints.

[Ndh Endpoint Testing Method Code System](CodeSystem-NdhEndpointTestingMethodCS.md)

This code system defines endpoint testing method concepts used by NDH to represent how endpoint conformance, certification, or validation evidence was produced.

[NDH FHIR Endpoint Use Case Code System](CodeSystem-NdhFhirEndpointUseCaseCS.md)

This code system defines NDH FHIR endpoint use-case concepts so endpoint capabilities can be tagged to specific interoperability workflows such as patient access, prior authorization, and payer exchange.

[NDH Insurance Status Code System](CodeSystem-NdhInsuranceStatusCS.md)

This code system defines normalized NDH insurance-coverage status concepts so implementations can consistently communicate whether coverage is present, absent, or insufficient.

[Ndh Organization Type Code System](CodeSystem-NdhOrgTypeCS.md)

This code system defines NDH organization-type categories used to classify directory entities by organizational role and operational context within provider directory exchanges.

[NDH Practitioner Role Codes Code System](CodeSystem-NdhPractitionerRoleCS.md)

This code system defines NDH practitioner role concepts used to classify professional function, participation type, and network-related responsibilities for practitioners and related entities.

[NDH Secure Exchange Artifacts Code System](CodeSystem-NdhSecureExchangeArtifactsCS.md)

This code system defines NDH secure-exchange artifact types, including certificate categories used to establish trust, identity, signing, and encryption context for interoperable endpoint exchange.

[NDH Trust FrameworkType Code System](CodeSystem-NdhTrustFrameworkTypeCS.md)

This code system defines NDH trust-framework type concepts so implementations can declare the policy and governance network under which exchange trust relationships operate.

[NDH Trust Profile Code System](CodeSystem-NdhTrustProfileCS.md)

This code system defines NDH trust-profile concepts that identify the registration and authorization profile family governing secure exchange behavior.

[NDH Resource Instance Verification Status Code System](CodeSystem-NdhVerificationStatusCS.md)

This code system defines NDH resource-instance verification status concepts used to communicate whether verification is complete, incomplete, or not required.

[Insurance Benefit Type Code System](CodeSystem-insurance-benefit-type.md)

This code system defines detailed insurance benefit-type and coverage-quantity concepts used to classify covered services, benefit dimensions, and plan-level coverage structures in a consistent computable format.

[NDH Example Rating Type Code System](CodeSystem-ndh-example-rating-type.md)

Example code system for rating types