Z79.634

Long term (current) use of topoisomerase inhibitor

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 4 never code together

Excludes2

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

Z79code

Excludes2

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

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 9

Z79code

Includes

Code also

Inclusion terms

Code also

Notes

Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:Z00-Z99 A00-Y89
(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Index entries leading here 1

Long-term (current) (prophylactic) drug therapy (use of)
- etoposide Z79.634
- irinotecan Z79.634
- topoisomerase inhibitor Z79.634
- topotecan Z79.634

Alongside this code 4 same parent — Z79.63

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

Present FY2024–FY2027.