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v1.0.0
ICD-10 Guide
DiagnosesAtrial Fibrillationflutter

Atrial Fibrillationflutter

ICD-10 Coding for Atrial Fibrillation/Flutter(I48.0, I48.11, I48.21)

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

Diagnosis Overview

What is Atrial Fibrillationflutter?
Essential facts and insights about Atrial Fibrillation/Flutter

Key Clinical Considerations:

  • Palpitations, shortness of breath, fatigue
  • Electrocardiogram (ECG) showing irregularly irregular rhythm, absence of P waves
  • Irregular pulse, possible signs of heart failure

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of arrhythmias, symptoms duration, and frequency
  • Use of terms like 'Atrial Fibrillation' or 'Atrial Flutter'
  • Examples: 'Patient presents with recurrent episodes of atrial fibrillation lasting more than 30 seconds.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Differentiate between paroxysmal, persistent, and chronic forms for accurate coding.
  • Common errors: Misclassifying the type of atrial fibrillation or failing to document symptoms.

Code Exclusions

Important Exclusions

  • Excluded conditions: Atrial fibrillation due to hyperthyroidism, post-surgical atrial fibrillation.
  • Alternative codes: Codes for other types of arrhythmias or heart conditions.

Related ICD-10 Codes

Primary Codes
I48.0
Paroxysmal atrial fibrillation
I48.1
Persistent atrial fibrillation
I48.2
Chronic atrial fibrillation
I48.91
Unspecified atrial fibrillation
I48.92
Unspecified atrial flutter
Ancillary Codes
Z86.79
I25.11
E05.90
Differential Codes
I48.11
I48.0

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Patient populations: Adults with cardiovascular disease, elderly patients.
  • Clinical settings: Cardiology clinics, emergency departments, inpatient care.

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 the type of atrial fibrillation/flutter, symptoms, and treatment plan.

Billing considerations?

Ensure accurate coding based on the type and duration of atrial fibrillation/flutter.