Compliance · 6 min read
NFPA 99 and Your AHJ: What Owners Should Know
NFPA 99 is the National Fire Protection Association's Health Care Facilities Code, and your Authority Having Jurisdiction (AHJ) is the local official — often a fire marshal or building department — who enforces the version your area has adopted.
Quick answer
- NFPA 99 is a model code; it becomes enforceable only when a state or local jurisdiction adopts it.
- Your AHJ interprets the code and signs off on installations, so requirements vary by location.
- Engage your AHJ early and document the conversation.
If you're installing a hyperbaric chamber, it helps to understand the codes and the local officials who interpret them. This is a general overview, not legal advice — always confirm requirements with your local AHJ.
What NFPA 99 is
NFPA 99 is the Health Care Facilities Code published by the National Fire Protection Association. It includes a chapter on hyperbaric facilities covering construction, equipment, and operating practices.
Codes like NFPA 99 are model standards. They become enforceable when a state or local jurisdiction adopts them, sometimes with amendments.
The role of your AHJ
The Authority Having Jurisdiction (AHJ) is the official or agency responsible for enforcing the applicable code in your area — often a fire marshal or building department. The AHJ interprets requirements and signs off on installations.
Because adoption and interpretation happen locally, two installations in different states can face different requirements even with the same equipment.
Why enforcement varies by state
Some states adopt NFPA 99 broadly and enforce it strictly; others apply a lighter touch or focus on specific settings. The practical takeaway is to engage your AHJ early and document the conversation.
Metisine Health publishes a state-by-state enforcement overview and supports owners through siting and documentation. Start with the landing page for your state, then talk with your local AHJ.
Common questions
Who is my AHJ?
Your Authority Having Jurisdiction is usually a local fire marshal or building official responsible for enforcing the adopted code. Contact your city or county building department to confirm.
Does every state enforce NFPA 99 the same way?
No. Adoption and interpretation happen locally, so requirements vary by state and even by jurisdiction. Confirm with your AHJ before installing.