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    v1.0.28
    OpenPayerBilling CodesEndocrine, Nutritional and Metabolic Diseases and DisordersDRG 639-diabetes-without-cc-mcc
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    Diabetes without CC/MCC: Inpatient Reimbursement Overview

    DRG 639 encompasses inpatient stays for diabetes without Complication or Comorbidity or Major Complication or Comorbidity, covering routine admissions with primary diabetes diagnoses. Accurate coding and documentation determine case assignment and therefore hospital reimbursement under Medicare inpatient payment rules.

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    DRG 639 Overview

    DRG 639 covers inpatient admissions for principal diagnosis of diabetes mellitus without Complication or Comorbidity and without Major Complication or Comorbidity. This Diagnosis-Related Group groups straightforward diabetes cases where inpatient resource use is generally limited compared with more complex diabetes admissions. It matters for Medicare payment because cases assigned here generate a lower payment weight than diabetes admissions with Complication or Comorbidity or Major Complication or Comorbidity, affecting hospital reimbursement and case-mix considerations. Assignment depends on coded principal and secondary diagnoses that document absence of qualifying complications or comorbidities.

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    Clinical Trials

    • Studies of inpatient glycemic management protocols and insulin titration strategies: randomized or pragmatic trials evaluate different insulin administration approaches (basal-bolus versus sliding scale, standardized order sets, or continuous glucose monitoring integration) among hospitalized adults admitted for diabetes without major complications. These trials focus on achieving safe inpatient glucose control, reducing hypoglycemia and hyperglycemia episodes, and shortening length of stay for patients whose admission is driven primarily by diabetes management needs. Findings are directly relevant to hospitalists and payers because optimized protocols can reduce avoidable complications, resource utilization, and readmission risk for this DRG population.
    • Comparative effectiveness research on diabetes education and discharge planning interventions during hospitalization: controlled cohort or cluster-randomized studies test structured inpatient diabetes education, medication reconciliation, and early outpatient follow-up scheduling versus usual care in patients with diabetes without CC/MCC. These studies target patients at risk for poor outpatient self-management or medication errors after discharge, measuring outcomes such as adherence to therapy, emergency visits, and 30-day readmissions. Results inform care pathways and reimbursement policies by identifying which in-hospital interventions most effectively prevent costly post-discharge utilization for this relatively lower-acuity diabetes group.
    • Observational and implementation studies of care coordination and integrated outpatient transition programs: prospective cohort or quality improvement research evaluates models that link hospitalized diabetic patients to primary care, endocrinology, or community diabetes programs, including telehealth follow-up, remote glucose monitoring, and pharmacist-led medication optimization. The patient population includes adults admitted for diabetes management without significant comorbid complications who require safe transition to ambulatory care to prevent deterioration. These studies are important to providers and payers because effective transitions can lower downstream acute-care use, inform value-based contracting, and guide allocation of case-management resources for DRG 639 patients.

    Related Codes

    614-ADRENAL-AND-PITUITARY-PROCEDURES-WITH-CC-MCC

    Adrenal and Pituitary Procedures with CC/MCC: Inpatient Reimbursement Overview

    615-ADRENAL-AND-PITUITARY-PROCEDURES-WITHOUT-CC-MCC

    Adrenal and Pituitary Procedures without CC/MCC: Inpatient Reimbursement Overview

    616-AMPUTATION-OF-LOWER-LIMB-FOR-ENDOCRINE-NUTRITIONAL-AND-METABOLIC-DISORDERS-WITH-MCC

    Amputation of Lower Limb for Endocrine, Nutritional and Metabolic Disorders with MCC: Inpatient Reimbursement Overview

    617-AMPUTATION-OF-LOWER-LIMB-FOR-ENDOCRINE-NUTRITIONAL-AND-METABOLIC-DISORDERS-WITH-CC

    Amputation of Lower Limb for Endocrine, Nutritional and Metabolic Disorders with CC: Inpatient Reimbursement Overview

    618-AMPUTATION-OF-LOWER-LIMB-FOR-ENDOCRINE-NUTRITIONAL-AND-METABOLIC-DISORDERS-WITHOUT-CC-MCC

    Amputation of Lower Limb for Endocrine, Nutritional and Metabolic Disorders without CC/MCC: Inpatient Reimbursement Overview

    619-O-R-PROCEDURES-FOR-OBESITY-WITH-MCC

    O.R. Procedures for Obesity with MCC: Inpatient Reimbursement Overview

    620-O-R-PROCEDURES-FOR-OBESITY-WITH-CC

    O.R. Procedures for Obesity with CC: Inpatient Reimbursement Overview

    621-O-R-PROCEDURES-FOR-OBESITY-WITHOUT-CC-MCC

    O.R. Procedures for Obesity without CC/MCC: Inpatient Reimbursement Overview

    622-SKIN-GRAFTS-AND-WOUND-DEBRIDEMENT-FOR-ENDOCRINE-NUTRITIONAL-AND-METABOLIC-DISORDERS-WITH-MCC

    Skin Grafts and Wound Debridement for Endocrine, Nutritional and Metabolic Disorders with MCC: Inpatient Reimbursement Overview

    623-SKIN-GRAFTS-AND-WOUND-DEBRIDEMENT-FOR-ENDOCRINE-NUTRITIONAL-AND-METABOLIC-DISORDERS-WITH-CC

    Skin Grafts and Wound Debridement for Endocrine, Nutritional and Metabolic Disorders with CC: Inpatient Reimbursement Overview

    Showing 1–10 of 25

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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