ICD-10-CM
ICD-10 code for Maintenance (encounter for) antineoplastic chemotherapy: Z51.11
The ICD-10-CM index points "Maintenance (encounter for) antineoplastic chemotherapy" to Z51.11, Encounter for antineoplastic chemotherapy. Z51.11 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in Z51
A header groups codes and is not billed. A billable code is one you can report.
- Z51Encounter for other aftercare and medical careHeader
- Z51.0Encounter for antineoplastic radiation therapyBillable
- Z51.1Encounter for antineoplastic chemotherapy and immunotherapyHeader
- Z51.11Encounter for antineoplastic chemotherapyBillable
- Z51.12Encounter for antineoplastic immunotherapyBillable
- Z51.5Encounter for palliative careBillable
- Z51.6Encounter for desensitization to allergensBillable
- Z51.8Encounter for other specified aftercareHeader
- Z51.81Encounter for therapeutic drug level monitoringBillable
- Z51.89Encounter for other specified aftercareBillable
- Z51.AEncounter for sepsis aftercareBillable
Code also
The CDC tabular list says a second code may be needed with this one. The note does not set which is listed first.
From Z51. A note on a category applies to every code under it.
Code also condition requiring care
Excludes1
Excludes1 means these codes are not reported together.
From Z51. A note on a category applies to every code under it.
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From Z51.1. A note on a category applies to every code under it.
- encounter for chemotherapy and immunotherapy for nonneoplastic condition - code to condition
Related pages
- Z51.11 code detailsNotes, nearby codes, CMS-HCC group
- Category Z51Every code under it
- Chapter 21Factors influencing health status
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Maintenance (encounter for) antineoplastic chemotherapy?
The ICD-10-CM index points "Maintenance (encounter for) antineoplastic chemotherapy" to Z51.11, Encounter for antineoplastic chemotherapy. Z51.11 is a billable code.
Is Z51.11 billable?
Yes. Z51.11 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to Z51.11?
The CDC tabular list gives 1 Excludes1 note (not coded together), 1 Excludes2 note (may be coded together when both are documented) for Z51.11 and the categories above it. They are listed on this page.
What chapter is Z51.11 in?
Chapter 21. Factors influencing health status.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.