Z51.0 ICD-10-CM Code: Encounter for antineoplastic radiation therapy
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 826 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH MAJOR O.R. PROCEDURES WITH MCC (MDC 17)
- MS-DRG 827 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH MAJOR O.R. PROCEDURES WITH CC (MDC 17)
- MS-DRG 828 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH MAJOR O.R. PROCEDURES WITHOUT CC/MCC (MDC 17)
- MS-DRG 829 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH OTHER PROCEDURES WITH CC/MCC (MDC 17)
- MS-DRG 830 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH OTHER PROCEDURES WITHOUT CC/MCC (MDC 17)
- MS-DRG 849 — RADIOTHERAPY (MDC 17)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for Z51.0 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- follow-up examination after treatment (Z08-Z09)
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- follow-up examination for medical surveillance after treatment (Z08-Z09)
Code Also
Additional codes that may be required to fully describe the encounter.
- condition requiring care
Nearest Codes in This Family
Official ICD-10-CM classifications closest to Z51.0 in its code family, with their registry titles.
- Z51 — Encounter for other aftercare and medical care
- Z51.1 — Encounter for antineoplastic chemotherapy and immunotherapy
- Z51.11 — Encounter for antineoplastic chemotherapy
- 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
- Z51.89 — Encounter for other specified aftercare
- Z51.A — Encounter for sepsis aftercare
Indexed Clinical Terms (6)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Admission (for), aftercare, radiation therapy (antineoplastic)
- Admission (for), radiation therapy (antineoplastic)
- Encounter (with health service) (for), radiation therapy (antineoplastic)
- Maintenance (encounter for), antineoplastic radiation therapy
- Radiation, therapy, encounter for
- Radiotherapy session