National Directory of Healthcare Providers & Services (NDH) Implementation Guide
1.0.0-ballot - ballot United States of America flag

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 1.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of and changes regularly. See the Directory of published versions



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This publication includes IP covered under the following statements.

Cross Version Analysis

This is an R4 IG. None of the features it uses are changed in R4B, so it can be used as is with R4B systems. Packages for both R4 ( and R4B ( are available.


.. National Directory of Healthcare Providers & Services (NDH) Implementation
... HL7 Terminology (THO)hl7.terminology.r4#5.5.0R4Automatically added as a dependency - all IGs depend on HL7 Terminology
... US Core Implementation
.... HL7 Terminology (THO)hl7.terminology.r4#5.0.0R4
.... FHIR Extensions Packhl7.fhir.uv.extensions.r4#1.0.0R4
.... Bulk Data Access IGhl7.fhir.uv.bulkdata#2.0.0R4
.... SMART App
.... us.nlm.vsac#0.11.0R4
.... Structured Data Capturehl7.fhir.uv.sdc#3.0.0R4
..... FHIR R4 package : Exampleshl7.fhir.r4.examples#4.0.1R4
.... us.cdc.phinvads#0.12.0R4
.... IHE FormatCode Vocabularyihe.formatcode.fhir#1.1.0R4
... Security for Scalable Registration, Authentication, and
.... HL7 Terminology (THO)hl7.terminology.r4#4.0.0R4
.... US
... Subscriptions R5 Backporthl7.fhir.uv.subscriptions-backport#0.1.0R4
... Mobile Care Services Discovery (mCSD)ihe.iti.mcsd#3.8.0R4
.... HL7 Terminology (THO)hl7.terminology.r4#3.1.0R4
.... Basic Audit Log Patterns (BALP)ihe.iti.balp#1.1.0R4

Package hl7.fhir.uv.extensions.r4#1.0.0

This IG defines the global extensions - the ones defined for everyone. These extensions are always in scope wherever FHIR is being used (built Sun, Mar 26, 2023 08:46+1100+11:00)

Package hl7.fhir.uv.bulkdata#2.0.0

FHIR based approach for exporting large data sets from a FHIR server to a client application (built Fri, Nov 26, 2021 05:56+1100+11:00)

Package hl7.fhir.r4.examples#4.0.1

Example resources in the R4 version of the FHIR standard

Package hl7.fhir.uv.sdc#3.0.0

The SDC specification provides an infrastructure to standardize the capture and expanded use of patient-level data collected within an EHR.
This includes two components:
* Support more sophisticated questionnaire/form use-cases such as those needed for research, oncology, pathology and other clinical domains.
*Support pre-population and auto-population of EHR data into forms/questionnaires for uses outside direct clinical care (patient safety, adverse event reporting, public health reporting, etc.). (built Tue, Mar 8, 2022 18:32+0000+00:00)

Package ihe.formatcode.fhir#1.1.0

Implementation Guide for IHE defined FormatCode vocabulary. (built Thu, Feb 24, 2022 16:55-0600-06:00)


The US Core Implementation Guide is based on FHIR Version R4 and defines the minimum conformance requirements for accessing patient data. The Argonaut pilot implementations, ONC 2015 Edition Common Clinical Data Set (CCDS), and ONC U.S. Core Data for Interoperability (USCDI) v1 provided the requirements for this guide. The prior Argonaut search and vocabulary requirements, based on FHIR DSTU2, are updated in this guide to support FHIR Version R4. This guide was used as the basis for further testing and guidance by the Argonaut Project Team to provide additional content and guidance specific to Data Query Access for purpose of ONC Certification testing. These profiles are the foundation for future US Realm FHIR implementation guides. In addition to Argonaut, they are used by DAF-Research, QI-Core, and CIMI. Under the guidance of HL7 and the HL7 US Realm Steering Committee, the content will expand in future versions to meet the needs specific to the US Realm. These requirements were originally developed, balloted, and published in FHIR DSTU2 as part of the Office of the National Coordinator for Health Information Technology (ONC) sponsored Data Access Framework (DAF) project. For more information on how DAF became US Core see the US Core change notes. (built Fri, Jun 30, 2023 14:02+0000+00:00)


This implementation guide describes how to extend OAuth 2.0 to support secure and scalable workflows for business-to-business (B2B) apps that implement the client credentials flow or authorization code flow. (built Tue, Sep 27, 2022 18:31+0000+00:00)

Package hl7.fhir.uv.subscriptions-backport#0.1.0

The Subscription R5 Backport Implementation Guide enables servers running verions of FHIR earlier than R5 to implement a subset of R5 Subscriptions in a standardized way. (built Mon, Dec 14, 2020 16:30+0000+00:00)

Package ihe.iti.balp#1.1.0

The Basic Audit Log Patterns (BALP) Implementation Guide is a Content Profile that defines some basic and reusable AuditEvent patterns. This includes basic audit log profiles for FHIR RESTful operations to be used when there is not a more specific audit event defined. A focus is enabling Privacy centric AuditEvent logs that hold well formed indication of the Patient when they are the subject of the activity being recorded in the log. Where a more specific audit event can be defined it should be derived off of these basic patterns. (built Wed, May 4, 2022 10:07-0500-05:00)

Package ihe.iti.mcsd#3.8.0

The IHE Mobile Care Services Discovery (mCSD) IG provides a transaction for mobile and lightweight browser-based applications to find and update care services resources. (built Fri, Aug 12, 2022 09:41-0500-05:00)


There are no Global profiles defined