Z51.1 ICD-10-CM Code: Encounter for antineoplastic chemotherapy and immunotherapy
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
Z51.1Encounter for antineoplastic chemotherapy and immunotherapy
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where Z51.1 sits
- 1
Chapter 21
Factors influencing health status and contact with health services (Z00-Z99)
- 2
Section
Encounters for other specific health care (Z40-Z53)
- 3
Category Z51
Encounter for other aftercare and medical care
- 4
Code Z51.1
Encounter for antineoplastic chemotherapy and immunotherapy
More specific choices
Codes under Z51.1
Z51.1 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for Z51.1.
Code first
No “code first” instruction is listed for Z51.1.
Use additional code
No “use additional code” instruction is listed for Z51.1.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for Z51.1.
Excludes2
Conditions not included here that may be reported separately when present.
- encounter for chemotherapy and immunotherapy for nonneoplastic condition - code to condition
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code Z51.1 mean?
Z51.1 is the FY 2027 U.S. ICD-10-CM code for “Encounter for antineoplastic chemotherapy and immunotherapy.”
Is Z51.1 a billable or specific ICD-10-CM code?
No. Z51.1 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is Z51.1 located in ICD-10-CM?
Z51.1 is listed in Chapter 21, Factors influencing health status and contact with health services (Z00-Z99), within Encounters for other specific health care (Z40-Z53) (Z40–Z53), under category Z51, Encounter for other aftercare and medical care.
What coding notes are listed for Z51.1?
No inclusion terms are listed for Z51.1 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: encounter for chemotherapy and immunotherapy for nonneoplastic condition - code to condition.
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