MS-DRG · FY 2026 v43.0

MS-DRG 639 – Diabetes without CC/MCC

A Medical DRG in MDC 10 (Endocrine, Nutritional & Metabolic Diseases & Disorders). Inpatient cases group to DRG 639 when the ICD-10-CM principal diagnosis is one of the 88 codes listed below and no secondary diagnosis on the CC or MCC lists is present. Its FY 2026 relative weight is 0.6212 with a geometric mean length of stay of 2.1 days.

Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.6212
Relative Weight
2.1
Geometric Mean LOS (days)
2.4
Arithmetic Mean LOS (days)
88
Principal Diagnosis Codes

Severity family

DRG 637with MCCWeight 1.4367 · GMLOS 3.9 daysDRG 638with CCWeight 0.8962 · GMLOS 2.9 daysDRG 639without CC/MCCWeight 0.6212 · GMLOS 2.1 days
How a case is assigned to DRG 639

The grouper first assigns the case to MDC 10 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), then applies the severity split from secondary diagnoses: with MCC → 637; with CC → 638; without CC/MCC → 639.

ICD-10-CM

Principal Diagnosis Codes 88 codes · 6 categories

88 of 88 shown
E08 Diabetes mellitus due to underlying condition17 codes
  • E08.00 Diabetes mellitus due to underlying condition with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
  • E08.01 Diabetes mellitus due to underlying condition with hyperosmolarity with coma
  • E08.10 Diabetes mellitus due to underlying condition with ketoacidosis without coma
  • E08.11 Diabetes mellitus due to underlying condition with ketoacidosis with coma
  • E08.618 Diabetes mellitus due to underlying condition with other diabetic arthropathy
  • E08.620 Diabetes mellitus due to underlying condition with diabetic dermatitis
  • E08.621 Diabetes mellitus due to underlying condition with foot ulcer
  • E08.622 Diabetes mellitus due to underlying condition with other skin ulcer
  • E08.628 Diabetes mellitus due to underlying condition with other skin complications
  • E08.630 Diabetes mellitus due to underlying condition with periodontal disease
  • E08.638 Diabetes mellitus due to underlying condition with other oral complications
  • E08.641 Diabetes mellitus due to underlying condition with hypoglycemia with coma
  • E08.649 Diabetes mellitus due to underlying condition with hypoglycemia without coma
  • E08.65 Diabetes mellitus due to underlying condition with hyperglycemia
  • E08.69 Diabetes mellitus due to underlying condition with other specified complication
  • E08.8 Diabetes mellitus due to underlying condition with unspecified complications
  • E08.9 Diabetes mellitus due to underlying condition without complications
E09 Drug or chemical induced diabetes mellitus17 codes
  • E09.00 Drug or chemical induced diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
  • E09.01 Drug or chemical induced diabetes mellitus with hyperosmolarity with coma
  • E09.10 Drug or chemical induced diabetes mellitus with ketoacidosis without coma
  • E09.11 Drug or chemical induced diabetes mellitus with ketoacidosis with coma
  • E09.618 Drug or chemical induced diabetes mellitus with other diabetic arthropathy
  • E09.620 Drug or chemical induced diabetes mellitus with diabetic dermatitis
  • E09.621 Drug or chemical induced diabetes mellitus with foot ulcer
  • E09.622 Drug or chemical induced diabetes mellitus with other skin ulcer
  • E09.628 Drug or chemical induced diabetes mellitus with other skin complications
  • E09.630 Drug or chemical induced diabetes mellitus with periodontal disease
  • E09.638 Drug or chemical induced diabetes mellitus with other oral complications
  • E09.641 Drug or chemical induced diabetes mellitus with hypoglycemia with coma
  • E09.649 Drug or chemical induced diabetes mellitus with hypoglycemia without coma
  • E09.65 Drug or chemical induced diabetes mellitus with hyperglycemia
  • E09.69 Drug or chemical induced diabetes mellitus with other specified complication
  • E09.8 Drug or chemical induced diabetes mellitus with unspecified complications
  • E09.9 Drug or chemical induced diabetes mellitus without complications
E10 Type 1 diabetes mellitus18 codes
  • E10.10 Type 1 diabetes mellitus with ketoacidosis without coma
  • E10.11 Type 1 diabetes mellitus with ketoacidosis with coma
  • E10.618 Type 1 diabetes mellitus with other diabetic arthropathy
  • E10.620 Type 1 diabetes mellitus with diabetic dermatitis
  • E10.621 Type 1 diabetes mellitus with foot ulcer
  • E10.622 Type 1 diabetes mellitus with other skin ulcer
  • E10.628 Type 1 diabetes mellitus with other skin complications
  • E10.630 Type 1 diabetes mellitus with periodontal disease
  • E10.638 Type 1 diabetes mellitus with other oral complications
  • E10.641 Type 1 diabetes mellitus with hypoglycemia with coma
  • E10.649 Type 1 diabetes mellitus with hypoglycemia without coma
  • E10.65 Type 1 diabetes mellitus with hyperglycemia
  • E10.69 Type 1 diabetes mellitus with other specified complication
  • E10.8 Type 1 diabetes mellitus with unspecified complications
  • E10.9 Type 1 diabetes mellitus without complications
  • E10.A0 Type 1 diabetes mellitus, presymptomatic, unspecified
  • E10.A1 Type 1 diabetes mellitus, presymptomatic, Stage 1
  • E10.A2 Type 1 diabetes mellitus, presymptomatic, Stage 2
E11 Type 2 diabetes mellitus18 codes
  • E11.00 Type 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
  • E11.01 Type 2 diabetes mellitus with hyperosmolarity with coma
  • E11.10 Type 2 diabetes mellitus with ketoacidosis without coma
  • E11.11 Type 2 diabetes mellitus with ketoacidosis with coma
  • E11.618 Type 2 diabetes mellitus with other diabetic arthropathy
  • E11.620 Type 2 diabetes mellitus with diabetic dermatitis
  • E11.621 Type 2 diabetes mellitus with foot ulcer
  • E11.622 Type 2 diabetes mellitus with other skin ulcer
  • E11.628 Type 2 diabetes mellitus with other skin complications
  • E11.630 Type 2 diabetes mellitus with periodontal disease
  • E11.638 Type 2 diabetes mellitus with other oral complications
  • E11.641 Type 2 diabetes mellitus with hypoglycemia with coma
  • E11.649 Type 2 diabetes mellitus with hypoglycemia without coma
  • E11.65 Type 2 diabetes mellitus with hyperglycemia
  • E11.69 Type 2 diabetes mellitus with other specified complication
  • E11.8 Type 2 diabetes mellitus with unspecified complications
  • E11.9 Type 2 diabetes mellitus without complications
  • E11.A Type 2 diabetes mellitus without complications in remission
E13 Other specified diabetes mellitus17 codes
  • E13.00 Other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
  • E13.01 Other specified diabetes mellitus with hyperosmolarity with coma
  • E13.10 Other specified diabetes mellitus with ketoacidosis without coma
  • E13.11 Other specified diabetes mellitus with ketoacidosis with coma
  • E13.618 Other specified diabetes mellitus with other diabetic arthropathy
  • E13.620 Other specified diabetes mellitus with diabetic dermatitis
  • E13.621 Other specified diabetes mellitus with foot ulcer
  • E13.622 Other specified diabetes mellitus with other skin ulcer
  • E13.628 Other specified diabetes mellitus with other skin complications
  • E13.630 Other specified diabetes mellitus with periodontal disease
  • E13.638 Other specified diabetes mellitus with other oral complications
  • E13.641 Other specified diabetes mellitus with hypoglycemia with coma
  • E13.649 Other specified diabetes mellitus with hypoglycemia without coma
  • E13.65 Other specified diabetes mellitus with hyperglycemia
  • E13.69 Other specified diabetes mellitus with other specified complication
  • E13.8 Other specified diabetes mellitus with unspecified complications
  • E13.9 Other specified diabetes mellitus without complications
R81 Glycosuria1 code
ICD-10-PCS

Procedure Codes

Procedure codes do not drive assignment for this DRG. DRG 639 is a Medical DRG, assigned from the principal diagnosis above.

Frequently Asked Questions

What is MS-DRG 639?

MS-DRG 639 (Diabetes without CC/MCC) is a medical DRG in MDC 10 (Endocrine, Nutritional & Metabolic Diseases & Disorders). Its FY 2026 relative weight is 0.6212 with a geometric mean length of stay of 2.1 days.

What is the difference between DRG 637, 638, 639?

All 3 share the same base category; the severity of secondary diagnoses separates them: 637 (with MCC), 638 (with CC), 639 (without CC/MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.

How many diagnosis codes group to DRG 639?

88 ICD-10-CM principal diagnosis codes group to this DRG, spanning 6 three-character categories.

What is the relative weight of DRG 639?

The FY 2026 relative weight of this DRG is 0.6212, meaning reimbursement of roughly 0.62 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.

← PreviousDRG 638 – Diabetes with CC
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.