ICD-10-CM diagnosis guide
Z79.4: Long term (current) use of insulin
An additional status code used when long-term insulin use is documented and applicable under ICD-10-CM guidance.
Educational relationship only. Use and sequencing depend on the complete encounter record and official guidelines. Insulin status alone does not establish CGM or supply coverage.
Documentation questions to research
- Underlying diabetes diagnosis
- Current insulin regimen
- Prescribed monitoring plan
- Device-specific eligibility criteria
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.