National Directory of Healthcare Providers & Services (NDH) Implementation Guide, published by HL7 International / Patient Administration. This guide is not an authorized publication; it is the continuous build for version 2.0.0-current built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-us-ndh/ and changes regularly. See the Directory of published versions

NDH Code Systems

Page standards status: Normative

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Example code system for rating types