Z79.890 — Hormone replacement therapy
Z79.890 is a billable, specific ICD-10-CM code for hormone replacement therapy. It is valid for submission on a claim.
Other codes that can never be billed with Z79.890
These codes carry an Excludes1 note pointing at Z79.890. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Z79.890 alone.
- Z79.81Long term (current) use of agents affecting estrogen receptors and estrogen levels
Risk adjustment
Z79.890 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
Z79.890 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57718Billing and Coding: Vitamin D Assay Testing
- A57736Billing and Coding: Vitamin D Assay Testing
- A58828Billing and Coding: Treatment of Males with Low Testosterone
How Z79.890 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Z79.890.
- Long-term›hormone replacement
- Therapy›drug, long-term›hormone replacement
Related codes at this level
Codes that share Z79.89. If Z79.890 is not quite right, the correct code is usually one of these.
Questions about Z79.890
- Is Z79.890 a billable ICD-10-CM code?
- Yes. Z79.890 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Z79.890 sit in the tabular list?
- Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).