All ICD10 Codes

DRG 864

Medical DRG

Fever and Inflammatory Conditions

TypeMedicalMDC18Dx Codes8

What is MS-DRG 864?

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 2026 it carries a relative weight of 0.8877 with a geometric mean length of stay of 2.6 days and an arithmetic mean of 3.2 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

Classification
Medical DRG
Diagnosis-driven grouping
MDC
Major Diagnostic Category 18
Linked Codes
8 diagnosis
Billable Dx
100%
8 of 8 shown

FY 2026 Payment Data

Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).

Relative Weight
0.8877
Payment multiplier vs. average case (1.0)
Geometric Mean LOS
2.6 days
Used for transfer payment calculations
Arithmetic Mean LOS
3.2 days
Average length of stay
Post-Acute Transfer
No
Not subject to the transfer policy

Linked ICD-10-CM Diagnosis Mappings

  • R50.2

    Drug induced fever

    BillableChapter 18
  • R50.81

    Fever presenting with conditions classified elsewhere

    BillableChapter 18
  • R50.82

    Postprocedural fever

    BillableChapter 18
  • R50.83

    Postvaccination fever

    BillableChapter 18
  • R50.84

    Febrile nonhemolytic transfusion reaction

    BillableChapter 18
  • R50.9

    Fever, unspecified

    BillableChapter 18
  • R65.10

    Systemic inflammatory response syndrome (SIRS) of non-infectious origin without acute organ dysfunction

    BillableChapter 18
  • R65.11

    Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction

    BillableChapter 18