All ICD10 Codes
MS-DRG 640Medical

Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC

Major Diagnostic Category 10·Grouped by diagnosis·FY 2027

MS-DRG 640 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 10 (MDC 10) with a Major Complication or Comorbidity (MCC). It maps to 130 ICD-10-CM diagnosis codes. For FY 2027 it carries a relative weight of 1.3395 with a geometric mean length of stay of 3.6 days and an arithmetic mean of 4.9 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:
1.3395 (payment multiplier vs. the average case (1.0))
Geometric mean stay:
3.6 days (used for transfer payments)
Average stay:
4.9 days (arithmetic mean)
Post-acute transfer policy:
Yes (early transfers can be paid less)

Same condition, other severity levels

CMS splits one condition into separate DRGs by how sick the patient is. With MCC pays more than with CC, which pays more than without CC/MCC.

DRGTitleRelative weightMean stay
640Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC (this page)1.33953.6 days
641Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC0.78652.5 days

Diagnosis codes (130)

As the principal diagnosis, these ICD-10-CM codes can group to DRG 640. 100% of the codes listed are billable.