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    v1.0.28
    OpenPayerBilling CodesEndocrine, Nutritional and Metabolic Diseases and DisordersDRG 642-inborn-and-other-disorders-of-metabolism
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    Inborn and Other Disorders of Metabolism: Inpatient Reimbursement Overview

    DRG 642 encompasses inborn errors of metabolism and other metabolic disorders requiring inpatient care; it captures complex diagnostic and treatment needs. This Diagnosis-Related Group matters for inpatient reimbursement because it groups cases with higher resource intensity and specialized services, influencing Medicare payment rates.

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    DRG 642 Overview

    DRG 642 covers hospital admissions for inborn errors of metabolism and other metabolic disorders that require significant inpatient evaluation or treatment, including enzyme deficiencies, amino acid and organic acid disorders, and acute metabolic decompensation. These conditions often involve complex diagnostic testing, specialized medical management, and sometimes intensive care, which can drive resource use. For Medicare payment, grouping under this Diagnosis-Related Group affects average payment relative to other medical DRGs because of the typically higher cost and specialized services involved. Accurate coding of principal diagnosis and any Complication or Comorbidity or Major Complication or Comorbidity is important to ensure appropriate assignment.

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    Clinical Trials

    • Trials evaluating rapid diagnostic and emergency metabolic stabilization protocols for patients presenting with acute metabolic decompensation (including newborns and children with urea cycle disorders, organic acidemias, or aminoacidopathies). These studies test timing and sequence of interventions such as IV fluids, ammonia-lowering strategies, and rapid biochemical testing workflows to shorten time to diagnosis and metabolic control. Results are directly relevant to inpatient providers and payers because faster stabilization can reduce ICU stays, prevent neurological injury, and lower high short-term costs associated with emergency admissions in this DRG.
    • Comparative effectiveness studies of chronic metabolic management strategies in pediatric and adult patients with inherited metabolic disorders, comparing approaches such as specialized dietary regimens, enteral feeding protocols, and coordinated multidisciplinary care models. These investigations enroll stable patients who require ongoing nutrient restriction, supplementation, or enzyme-replacement-like therapies to assess outcomes like frequency of hospitalizations for decompensation, growth and neurodevelopment, and healthcare resource use. Findings inform clinicians and payers about which long-term outpatient management strategies most effectively reduce inpatient utilization and costs for this population.
    • Longitudinal outcomes and transition-of-care research following hospital discharge for patients with inborn metabolic disorders, focusing on readmission risk factors, adherence to metabolic prescriptions, and the effectiveness of transition programs from pediatric to adult services. These studies follow cohorts after an index hospitalization to measure quality-of-life, functional status, emergency readmissions, and cost trajectories over months to years. Understanding these outcomes helps hospitals and payers design discharge planning, case management, and community support services that can decrease readmissions and improve long-term outcomes for patients categorized under DRG 642.

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

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

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    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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