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    v1.0.28
    OpenPayerBilling CodesEndocrine, Nutritional and Metabolic Diseases and DisordersDRG 644-endocrine-disorders-with-cc
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    Endocrine Disorders with CC: Inpatient Reimbursement Overview

    DRG 644 encompasses inpatient admissions for endocrine disorders with a Complication or Comorbidity, such as complicated diabetes, severe thyroid conditions, and adrenal or pituitary disorders that increase resource use. Correct assignment of this Diagnosis-Related Group matters because it adjusts Medicare inpatient reimbursement to reflect the higher complexity and expected costs of care.

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    DRG 644 Overview

    DRG 644 covers inpatient admissions for endocrine disorders where a Complication or Comorbidity is present, including conditions such as uncontrolled diabetes with acute metabolic complications, significant thyroid dysfunction, and adrenal or pituitary disorders that complicate care. This Diagnosis-Related Group groups patients with increased clinical complexity that typically require additional monitoring, diagnostic workup, or therapeutic intervention. For Medicare payment, grouping to DRG 644 affects relative reimbursement by recognizing the added resource use associated with these complications. Accurate coding of the endocrine diagnosis and accompanying Complication or Comorbidity is therefore essential to assign the correct Diagnosis-Related Group for payment purposes.

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    Clinical Trials

    • Acute inpatient management trials assessing protocols for rapid stabilization of endocrine crises (for example severe diabetic ketoacidosis, thyrotoxic storm, or adrenal insufficiency) that compare different insulin administration regimens, fluid and electrolyte correction strategies, or steroid replacement approaches. These studies enroll hospitalized adults presenting with life‑threatening endocrine decompensation and measure time to metabolic control, complication rates, ICU transfer, and length of stay. Results inform inpatient pathways and resource use that directly affect DRG cost drivers and discharge readiness for providers and payers.
    • Comparative effectiveness studies of in‑hospital care models for complex endocrine patients with comorbidities (for example multi‑morbidity patients with diabetes plus renal impairment or heart failure) comparing endocrinology consultation plus standardized order sets versus usual care. These trials or pragmatic studies focus on hospitalized patients with endocrine diagnoses complicated by CC (complication/comorbidity) and assess outcomes such as glycemic variability, hypoglycemia incidence, readmission within 30 days, and total hospital costs. Findings help hospitals and payers optimize service delivery, reduce adverse events, and align reimbursement incentives with value-based care.
    • Post‑discharge and transitional care research evaluating interventions to reduce readmissions and improve outpatient follow‑up after an endocrine hospitalization, including care coordination programs, structured education, medication reconciliation, and remote monitoring. These studies enroll patients discharged with ongoing endocrine management needs (insulin adjustments, steroid tapering, or thyroid therapy) and track adherence, outpatient utilization, readmissions, and patient‑reported outcomes over 30–90 days. Evidence from these studies guides discharge planning, case management strategies, and payer investments in post‑acute support to lower preventable readmissions and downstream costs.

    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

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    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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