Z51.1
⚠ Non-billable
Encounter for antineoplastic chemotherapy and immunotherapy
ICD-10-CM · FY2026 · Factors Influencing Health Status
Code
Z51.1
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Factors Influencing Health Status
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code Z51.1?
ICD-10-CM code Z51.1 represents Encounter for antineoplastic chemotherapy and immunotherapy. It is a non-billable header code requiring a more specific subcategory in the Factors Influencing Health Status chapter, effective October 1, 2025 – September 30, 2026.
Is Z51.1 billable?
No. Z51.1 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is Z51.1 in?
Z51.1 belongs to the Factors Influencing Health Status chapter (Z00–Z99) of ICD-10-CM.
Related codes in the Z51 category
Z51
Encounter for other aftercare and medical care
Non-billable
Z51.0
Encounter for antineoplastic radiation therapy
Billable
Z51.5
Encounter for palliative care
Billable
Z51.6
Encounter for desensitization to allergens
Billable
Z51.8
Encounter for other specified aftercare
Non-billable
Z51.A
Encounter for sepsis aftercare
Billable
Z51.11
Encounter for antineoplastic chemotherapy
Billable
Z51.12
Encounter for antineoplastic immunotherapy
Billable
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