93793

Anticoagulant Management for Warfarin

CPT 93793 describes the non-face-to-face management of a patient taking warfarin (brand name Coumadin), a vitamin K antagonist anticoagulant. This procedure code is utilized when a physician or qualified healthcare professional (QHP) reviews and interprets a newly obtained International Normalized Ratio (INR) test result. The clinical process involves comparing the current INR value—whether obtained via a home monitoring device, an office-based point-of-care test, or a clinical laboratory—against the patient's specific therapeutic target range. Typically, this range is 2.0 to 3.0 for conditions like atrial fibrillation or venous thromboembolism, and 2.5 to 3.5 for patients with mechanical heart valves. The provider must evaluate the result in the context of the patient's dosage history, dietary changes, potential drug-drug interactions, and clinical symptoms such as signs of bleeding or thromboembolism. Based on this interpretation, the clinician determines if a dosage adjustment is necessary, which may involve changing the daily milligram intake, skipping doses, or administering a one-time 'boost' dose. The provider then communicates these instructions to the patient or their caregiver and schedules the next interval for INR testing. This code is essential for outpatient longitudinal care to ensure patient safety and medication efficacy. Documentation must clearly show the review of the result, the resulting interpretation, the specific instructions provided to the patient, and the planned date for the subsequent test.

Clinical Indications

  • Long-term management of chronic atrial fibrillation
  • Treatment and secondary prevention of deep vein thrombosis (DVT)
  • Treatment and secondary prevention of pulmonary embolism (PE)
  • Management of mechanical prosthetic heart valves
  • Management of hypercoagulable states such as Antiphospholipid Syndrome
  • Prophylaxis against systemic embolism in patients with rheumatic mitral valve disease
  • Post-operative anticoagulation following certain orthopedic or cardiac surgeries

Procedure Steps

  1. Receive and review a new International Normalized Ratio (INR) test result.
  2. Verify the patient's current warfarin dosage and therapeutic target range.
  3. Interpret the INR result in relation to historical values and current clinical status.
  4. Determine if any adjustments to the warfarin dosing schedule are required.
  5. Identify any complicating factors such as new medications, illness, or dietary changes.
  6. Formulate a plan for the next follow-up INR test based on the stability of the result.
  7. Communicate dosage changes and the next testing date directly to the patient or caregiver.
  8. Document the result, interpretation, dosage instructions, and follow-up plan in the medical record.

Coding Guidelines

  • 93793 should not be reported if an E/M service (e.g., 99212-99215) is performed on the same day.
  • This code is only for patients taking warfarin; it is not for use with Direct Oral Anticoagulants (DOACs) like apixaban or rivaroxaban.
  • Only one unit of 93793 may be reported per day, regardless of the number of test results reviewed.
  • Do not report 93793 in conjunction with 99366-99368 (medical team conferences).
  • Do not report 93793 during the same service period as chronic care management (99487, 99489, 99490) or complex chronic care management.
  • This code replaces the deleted codes 99363 and 99364 and is billed per result rather than per timeframe.
  • The service must be performed by a physician or other qualified health care professional.

Associated ICD-10 Codes