MS-DRG · FY 2026 v43.0

MS-DRG 849 – Radiotherapy

A Medical DRG in MDC 17 (Myeloproliferative Diseases & Disorders, Poorly Differentiated Neoplasms). Inpatient cases group to DRG 849 when the ICD-10-CM principal diagnosis is one of the 1 codes listed below. Its FY 2026 relative weight is 2.7095 with a geometric mean length of stay of 7.1 days.

Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
2.7095
Relative Weight
7.1
Geometric Mean LOS (days)
9.8
Arithmetic Mean LOS (days)
1
Principal Diagnosis Codes
How a case is assigned to DRG 849

The grouper first assigns the case to MDC 17 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here).

ICD-10-CM

Principal Diagnosis Codes 1 code · 1 category

Z51 Encounter for other aftercare and medical care1 code
  • Z51.0 Encounter for antineoplastic radiation therapy
ICD-10-PCS

Procedure Codes

Procedure codes do not drive assignment for this DRG. DRG 849 is a Medical DRG, assigned from the principal diagnosis above.

Frequently Asked Questions

What is MS-DRG 849?

MS-DRG 849 (Radiotherapy) is a medical DRG in MDC 17 (Myeloproliferative Diseases & Disorders, Poorly Differentiated Neoplasms). Its FY 2026 relative weight is 2.7095 with a geometric mean length of stay of 7.1 days.

How many diagnosis codes group to DRG 849?

1 ICD-10-CM principal diagnosis codes group to this DRG, spanning 1 three-character category.

What is the relative weight of DRG 849?

The FY 2026 relative weight of this DRG is 2.7095, meaning reimbursement of roughly 2.71 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.

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Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.