849 MS-DRG: RADIOTHERAPY
MS-DRG 849 groups Medicare inpatient hospital stays for: RADIOTHERAPY. This is a medical MS-DRG. It falls under MDC 17 (Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 17 — Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms |
| DRG Type | Medical |
| Severity Level | N/A |
| Relative Weight | 2.5857 |
| Relative Weight (10% Cap Applied) | 2.5857 |
| Geometric Mean Length of Stay | 6.5 days |
| Arithmetic Mean Length of Stay | 9 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
1 diagnosis code can drive assignment here: Z51.0.
From the CMS MS-DRG Definitions Manual (Appendices B and E). Assignment also depends on severity, discharge status and the rest of the claim.
Contextual Map
Every relationship of 849 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Major Diagnostic Category
- MDC 17 — Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses
- Z51.0 — Encounter for antineoplastic radiation therapy[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
Read from: CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44. All data sources · How to read the labels · How MedCoder verifies its implementation
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources