Z79.624 — Long term (current) use of inhibitors of nucleotide synthesis
Is Z79.624 billable?
Yes — Z79.624 is billable for FY2027. Z79.624 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Z79.624 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Z79.624 at a glance
| Code | Z79.624 |
|---|---|
| Description | Long term (current) use of inhibitors of nucleotide synthesis |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What Medicare edits apply to Z79.624?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name Z79.624 directly.
CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.
Which MS-DRGs does Z79.624 group to?
Z79.624 sits in MDC 23 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 949Aftercare with CC/MCCmedical
- 950Aftercare without CC/MCCmedical
How is Z79.624 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Z79.624. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Long-term › azathioprine (current) (prophylactic) drug therapy (use of)
- Long-term › inhibitors of nucleotide synthesis (current) (prophylactic) drug therapy (use of)
- Long-term › mycophenolate (current) (prophylactic) drug therapy (use of)
- Long-term › purine synthesisinhibitors (current) (prophylactic) drug therapy (use of)
Inclusion terms
Alternative wording in documentation that is classified to Z79.624.
- Long term (current) use of azathioprine
- Long term (current) use of mycophenolate
- Long term (current) use of purine synthesis (IMDH) inhibitors
Excludes2 — not included here — inherited from Z79
The conditions below are not part of Z79.624, but a patient may have both at the same time. When documentation supports it, Z79.624 and the excluded code may both be reported.
Excludes2 — not included here — inherited from Z79.6
The conditions below are not part of Z79.624, but a patient may have both at the same time. When documentation supports it, Z79.624 and the excluded code may both be reported.
Code also — inherited from Z77-Z99
Two codes may be needed to describe the condition fully. Whether Z79.624 is sequenced first depends on the reason for the encounter.
- any follow-up examination (Z08-Z09)
Code also — inherited from Z79
Two codes may be needed to describe the condition fully. Whether Z79.624 is sequenced first depends on the reason for the encounter.
- any therapeutic drug level monitoring (Z51.81)
How long has Z79.624 existed?
Z79.624 first appears in FY2023.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.