Z51.1
Non-billableEncounter for antineoplastic chemotherapy and immunotherapy
Z51.1 is the ICD-10-CM code for Encounter for antineoplastic chemotherapy and immunotherapy. It is a non-billable category code — use a more specific child code such as Z51.11 for billing.
Z00-Z99 Factors influencing health status and contact with health services
What this means — in plain language
MedlinePlus · NIHWhat is cancer chemotherapy? Cancer chemotherapy is a type of cancer treatment. It uses medicines to destroy cancer cells. Normally, your body forms new cells as needed, replacing old cells that die. Cancer cells keep growing without control. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor. Chemotherapy works by killing the…
Read more about Cancer Chemotherapy at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Excludes2 — not included here
- •encounter for chemotherapy and immunotherapy for nonneoplastic condition - code to condition
Medications indicated for this condition
FDA labeling- Promethazine›
- AcetazolamideCarbonic Anhydrase Inhibitor [EPC]›
- Neostigmine›
- Palonosetron›
- Promethazine Hci›
- Sugammadex›
Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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