Z79.631

Z79.631: Long term (current) use of antimetabolite agent

Billable / specific codeICD-10-CMPOA exempt

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.

Check Z79.631 with the rest of the claim: free scrubber

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

Excludes2 inherited from the categories above Z79.631

Not part of this code, but both may be coded when both are present.

Written on Z79.6: Long term (current) use of immunomodulators and immunosuppressants

long term (current) use of steroids (Z79.5-)
long term (current) use of agents affecting estrogen receptors and estrogen levels (Z79.81-)

Written on Z79: Long term (current) drug therapy

drug abuse and dependence (F11-F19)
drug use complicating pregnancy, childbirth, and the puerperium (O99.32-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

Z79.631 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A57718Billing and Coding: Vitamin D Assay Testing
A59186Billing and Coding: Magnesium

Alphabetic index entries that lead here

Long-term›5-fluorouracil
Long-term›6-mercaptopurine
Long-term›antimetabolite agent
Long-term›cytarabine

Code history

Unchanged in every release from FY2024 to FY2027.