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Z79.624

Z79.624: Long term (current) use of inhibitors of nucleotide synthesis

Billable / specific codeICD-10-CMPOA exempt

Z79.624 is a billable, specific ICD-10-CM code for long term (current) use of inhibitors of nucleotide synthesis. It is valid for submission on a claim.

Check Z79.624 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 azathioprine
  • Long term (current) use of mycophenolate
  • Long term (current) use of purine synthesis (IMDH) inhibitors

Excludes2 inherited from the categories above Z79.624

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

Z79.624 is named in 1 Medicare coverage policy: 1 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A57718Billing and Coding: Vitamin D Assay Testing

Alphabetic index entries that lead here

  • Long-term›azathioprine
  • Long-term›inhibitors of nucleotide synthesis
  • Long-term›mycophenolate
  • Long-term›purine synthesis inhibitors(IMDH)

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under Z79.62

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.