Z51.11 Encounter for antineoplastic chemotherapy

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Z51 Encounter for other aftercare and medical care

Excludes1 (never code together)

• follow-up examination after treatment (Z08-Z09)

Code also

• condition requiring care

Applies from Z51.1 Encounter for antineoplastic chemotherapy and immunotherapy

Excludes2 (not included here)

• encounter for chemotherapy and immunotherapy for nonneoplastic condition - code to condition

MS-DRG index

Defines the logic of DRG(s) 826-828 in MDC 17.

Approximate ICD-9-CM (GEMs)

• V58.11 Encounter for antineoplastic chemotherapy

Code annotations containing back-references to Z51.11

Back-references to Z51

• Type 1 Excludes: Z08 Encounter for follow-up examination after completed treatment for malignant neoplasm ("aftercare following medical care (Z43-Z49, Z51)")
• Type 1 Excludes: Z09 Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm ("aftercare following medical care (Z43-Z49, Z51)")
• Type 2 Excludes: Z98 Other postprocedural states ("aftercare (Z43-Z49, Z51)")

Diagnosis Index entries for Z51.11

• Chemotherapy (session) (for) › cancer
• Chemotherapy (session) (for) › neoplasm
• Encounter (with health service) (for) › chemotherapy for neoplasm
• Maintenance (encounter for) › antineoplastic chemotherapy

Nearby codes

• Z51 Encounter for other aftercare and medical care
• Z51.0 Encounter for antineoplastic radiation therapy
• Z51.1 Encounter for antineoplastic chemotherapy and immunotherapy
• Z51.11 Encounter for antineoplastic chemotherapy (this code)
• Z51.12 Encounter for antineoplastic immunotherapy
• Z51.5 Encounter for palliative care
• Z51.6 Encounter for desensitization to allergens
• Z51.8 Encounter for other specified aftercare
• Z51.81 Encounter for therapeutic drug level monitoring