Z79.631 — Long term (current) use of antimetabolite agent
Z79.631 is a billable, specific ICD-10-CM code for long term (current) use of antimetabolite agent. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Long term (current) use of 5-fluorouracil
- Long term (current) use of 6-mercaptopurine
- Long term (current) use of cytarabine
- Long term (current) use of methotrexate
Risk adjustment
Z79.631 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
Z79.631 is named in 2 Medicare coverage policies — 2 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
- A59186Billing and Coding: Magnesium
How Z79.631 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 Z79.631.
- Long-term›5-fluorouracil
- Long-term›6-mercaptopurine
- Long-term›antimetabolite agent
- Long-term›cytarabine
Related codes at this level
Codes that share Z79.63. If Z79.631 is not quite right, the correct code is usually one of these.
Questions about Z79.631
- Is Z79.631 a billable ICD-10-CM code?
- Yes. Z79.631 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Z79.631 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).