Confirm NFPA 99 as the governing code for a medical gas/vacuum piping project and identify which edition actually applies

Steps

1. Identify NFPA 99, Health Care Facilities Code, Chapter 5 (Gas and Vacuum Piping Systems) as the core national standard governing med-gas piping installation, testing, and personnel qualifications
2. Note that NFPA itself has published multiple recent editions (2024 edition current for purchase; a 2027 edition has also been released by NFPA) — publication of a new edition does not mean it is locally in force
3. Determine the edition actually adopted by the project's AHJ: check the state/local building or health-facility code adoption (many jurisdictions and CMS Conditions of Participation reference an older edition, e.g., 2012 or 2018, for years after a newer edition is published)
4. Confirm the adopted edition directly with the state health facility plan-review authority or local AHJ before citing section numbers, since section numbering shifts between editions
5. Cross-reference any state-specific amendments or a state mechanical/plumbing code chapter (e.g., a state's adopted UPC Chapter 13) that may modify or supplement NFPA 99 locally