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 2022 STU 1 Ballot Reconciliation Targeting May Targeting September 2023 Ballot | https://github.com/HL7-FAST/national-directory Hosted: https://national-directory.fast.hl7.org/ | 8 | Patient Administration | 1690 | National Healthcare Directory PSS | National Directory |