MS-DRG 864Medical
Fever and Inflammatory Conditions
Major Diagnostic Category 18·Grouped by diagnosis·FY 2027
MS-DRG 864 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 18 (MDC 18). It maps to 8 ICD-10-CM diagnosis codes. For FY 2027 it carries a relative weight of 0.8551 with a geometric mean length of stay of 2.5 days and an arithmetic mean of 3.2 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.
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FY 2027 payment data
From Table 5 of the FY 2027 IPPS Final Rule (CMS).
- Relative weight:
- 0.8551 (payment multiplier vs. the average case (1.0))
- Geometric mean stay:
- 2.5 days (used for transfer payments)
- Average stay:
- 3.2 days (arithmetic mean)
- Post-acute transfer policy:
- No (not subject to it)
Diagnosis codes (8)
As the principal diagnosis, these ICD-10-CM codes can group to DRG 864. 100% of the codes listed are billable.
- R50.2Drug induced fever
- R50.81Fever presenting with conditions classified elsewhere
- R50.82Postprocedural fever
- R50.83Postvaccination fever
- R50.84Febrile nonhemolytic transfusion reaction
- R50.9Fever, unspecified
- R65.10Systemic inflammatory response syndrome (SIRS) of non-infectious origin without acute organ dysfunction
- R65.11Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction