National Directory of Healthcare Providers & Services (NDH) | National Healthcare Directory | The National Directory Exchange IG; Query IG, and Attestation & Verification IG have been combined into a single IG | September 2023 STU 1 Ballot | https://github.com/hl7-fast/national-directory/tree/hapi Hosted: | 11 | Patient Administration | 1690 | National Healthcare Directory PSS | National Directory |