ICD-10-CM diagnosis guide
Z99.81: Dependence on supplemental oxygen
A status code that reports oxygen dependence when supported by the record.
Educational relationship only. A status code describes a patient circumstance; it does not replace the underlying diagnosis, testing, oxygen order, or coverage requirements.
Documentation questions to research
- Underlying condition
- Current oxygen use
- Objective qualification evidence
- Continued need where required
Candidate HCPCS research
These links are possible workflow relationships, not a coding recommendation or coverage finding.
Open claim research workbenchCode-set status and official sources
Reviewed 2026-07-16 against the listed CMS resources for the April 1, 2026 through September 30, 2026 code-file window. Always verify additions, deletions, revisions, sequencing, and encounter-specific guidance.