Summary & Overview
CPT 93793: INR Result Review and Warfarin Dose Adjustment
CPT code 93793 represents the clinical service of reviewing and interpreting a new INR test result for a patient on chronic warfarin therapy, with dose adjustment, patient instruction, and scheduling of further testing as indicated. This code captures a focused anticoagulation management encounter that is important nationally because warfarin remains a widely used oral anticoagulant requiring frequent monitoring to maintain therapeutic ranges and reduce bleeding or thrombotic risk.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will get a concise clinical context for when 93793 is used, expected sites of service (ambulatory clinics, outpatient labs, and telehealth management), and the types of documentation elements tied to this service. The publication also outlines benchmarks and common billing considerations, summarizes relevant payer coverage patterns where available, and highlights recent policy updates affecting anticoagulation management coding and reimbursement. Clinical implications for patient safety and continuity of care are discussed to provide operational context for practices that manage patients on warfarin.
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes is noted where applicable.
Billing Code Overview
CPT code 93793 describes the review and interpretation of a new International Normalized Ratio (INR) test result for a patient on regular warfarin therapy. The service includes adjusting the warfarin dose if needed, providing patient instruction on continued treatment, and scheduling follow-up INR testing when appropriate.
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Service type: Anticoagulation management consultation based on a laboratory INR result
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Typical site of service: Ambulatory clinic, outpatient laboratory follow-up, or telehealth/remote management setting
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult on chronic warfarin therapy for atrial fibrillation or a venous thromboembolism who obtains an outpatient INR laboratory result. The provider (anticoagulation clinic clinician, primary care physician, cardiologist, or pharmacist with appropriate privileges) reviews the new INR value, evaluates recent bleeding or thrombotic symptoms and concurrent medications, and determines whether a change in warfarin dose is required. The workflow includes confirmation of the INR result, clinical assessment (medication changes, diet, alcohol, illness), documented dose adjustment or maintenance instruction, patient education on next steps and bleeding precautions, scheduling or ordering the next INR test, and contemporaneous documentation of the interpretation and plan in the medical record. Typical site of service is an outpatient clinic, anticoagulation management service, or telehealth/telephone follow-up when remote review is allowed. Typical patient scenario: a 68‑year‑old with nonvalvular atrial fibrillation uses routine weekly point-of-care or laboratory INR monitoring; a new INR of 3.8 prompts the clinician to reduce warfarin dose, provide instructions, and order a repeat INR within 48–72 hours.
Coding Specifications
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