Z51.1
Encounter for antineoplastic chemotherapy and immunotherapy
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 3 never code together
Z51.1code
Excludes2
- encounter for chemotherapy and immunotherapy for nonneoplastic condition - code to condition
Z40-Z53block
Excludes2
- follow-up examination for medical surveillance after treatment (Z08-Z09)Z08-Z09
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 5
Z51code
Code also
- condition requiring care
Z40-Z53block
Inclusion terms
- Categories Z40-Z53 are intended for use to indicate a reason for care. They may be used for patients who have already been treated for a disease or injury, but who are receiving aftercare or prophylactic care, or care to consolidate the treatment, or to deal with a residual stateZ40-Z53
Z00-Z99chapter
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-Z99A00-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 filed at null
No alphabetic index entry points at this code.
Alongside this code 5 same parent — Z51
Subordinate codes 2
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.