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v1.0.0
ICD-10 Guide
DiagnosesWarfarin

Warfarin

ICD-10 Coding for Warfarin Therapy Management(R79.8, Z79.01)

PRIMARY SPECIALTYPharmacy
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Warfarin?
Essential facts and insights about Warfarin Therapy Management

Key Clinical Considerations:

  • Increased risk of thromboembolism
  • Prolonged prothrombin time (PT) and International Normalized Ratio (INR)
  • Signs of bleeding (e.g., bruising, hematuria)

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient's INR levels and adjustments made
  • Indication for warfarin therapy (e.g., atrial fibrillation, DVT)
  • Monitoring frequency and results

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for anticoagulation management and monitoring.
  • Common errors include incorrect coding of INR levels or failure to document indications.

Code Exclusions

Important Exclusions

  • Patients on alternative anticoagulants (e.g., direct oral anticoagulants)
  • Conditions not requiring anticoagulation therapy

Related ICD-10 Codes

Primary Codes
I48.91
Unspecified atrial fibrillation
I82.90
Unspecified venous embolism and thrombosis
Ancillary Codes
Z92.1
Differential Codes
D68.32
Z92.82

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Pharmacy

Specialty Applications

  • Patients with atrial fibrillation, venous thromboembolism, or mechanical heart valves
  • Outpatient pharmacy settings and anticoagulation clinics

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Document INR levels, indications for therapy, and any adverse effects.

Billing considerations?

Ensure accurate coding of diagnosis and monitoring services for reimbursement.