DRG 639

Medical DRG

Diabetes without CC/MCC

TypeMedicalMDC10Dx Codes8

What is MS-DRG 639?

MS-DRG 639 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 10 (MDC 10) without a significant Complication or Comorbidity. It maps to 8 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 0.6212 with a geometric mean length of stay of 2.1 days and an arithmetic mean of 2.4 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

Classification

Medical DRG

Diagnosis-driven grouping

MDC

Major Diagnostic Category 10

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

0.6212

Payment multiplier vs. average case (1.0)

Geometric Mean LOS

2.1 days

Used for transfer payment calculations

Arithmetic Mean LOS

2.4 days

Average length of stay

Post-Acute Transfer

Yes

Subject to the post-acute care transfer policy

Related MS-DRGs in This Severity Group

The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.

DRG	Title	Rel. Weight	GMLOS
637	Diabetes with MCC	1.4367	3.9 days
638	Diabetes with CC	0.8962	2.9 days
639	Diabetes without CC/MCCThis page	0.6212	2.1 days

Linked ICD-10-CM Diagnosis Mappings

E07.81
Sick-euthyroid syndrome
BillableChapter 4
E08.9
Diabetes mellitus due to underlying condition without complications
BillableChapter 4
E09.9
Drug or chemical induced diabetes mellitus without complications
BillableChapter 4
E10.9
Type 1 diabetes mellitus without complications
BillableChapter 4
E11.9
Type 2 diabetes mellitus without complications
BillableChapter 4
E11.A
Type 2 diabetes mellitus without complications in remission
BillableChapter 4
E13.9
Other specified diabetes mellitus without complications
BillableChapter 4
R81
Glycosuria
BillableChapter 18