DRG 603 Overview

DRG 603 covers hospital admissions for cellulitis without Major Complication or Comorbidity and represents cases where the infection is managed medically without higher-severity secondary diagnoses. This Diagnosis-Related Group is focused on skin and soft tissue infection treatment, often involving intravenous antibiotics and observation for systemic signs. It matters for Medicare payment because the assigned Diagnosis-Related Group determines the inpatient prospective payment and influences resource use classification for Centers for Medicare & Medicaid Services billing. Accurate capture of clinical complexity affects grouping into DRG 603 versus higher-paying Diagnosis-Related Groups.

Across payers the observed rate range runs from about $370 up to $31K, with the widest spread between the minimum and maximum being roughly $31K as shown in the table and chart below. Among named payers, Aetna and Anthem report higher medians (around $16K and $13K respectively) while BCBS shows a lower median near $8K; Cigna and other payers fall in between. Refer to the payer table and distribution chart below for payer-specific quartiles and extremes.

• Acute antimicrobial strategy trials: randomized or pragmatic studies comparing shorter versus standard-duration intravenous-to-oral antibiotic regimens for hospitalized adults with moderate-severity cellulitis (no major comorbid complications). These studies focus on time to clinical stability, length of IV therapy, early discharge readiness, and readmission for recurrent infection, targeting the common inpatient pathway for DRG 603 patients. Results are relevant to providers for optimizing antibiotic stewardship and to payers for reducing inpatient days and infusion-related costs.
• Comparative effectiveness and wound-care pathway studies: multicenter trials or cohort studies comparing standardized care bundles (e.g., early source control, standardized wound assessment, outpatient wound clinic linkage) versus usual care for patients with limb cellulitis without systemic complications. The population includes adults admitted for cellulitis without MCC who may have peripheral edema, chronic venous disease, or minor skin breaks; outcomes include wound healing, treatment failure, and resource utilization. These investigations inform best-practice inpatient pathways that can lower variability in care, reduce resource use, and improve discharge planning important to hospital reimbursements.
• Post-discharge outcomes and readmission risk studies: observational or pragmatic registry-based research assessing predictors of 30-day readmission, emergency visits, and patient-reported functional recovery after hospitalization for cellulitis without MCC, often including socioeconomic factors, adherence to outpatient antibiotics, and availability of home health services. The patient population studied comprises survivors of an uncomplicated inpatient stay whose post-discharge care determines recurrence and downstream costs. Findings guide payers and case managers on targeting transitional care interventions and allocating outpatient support to reduce avoidable readmissions and overall cost of care.