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v1.0.0
ICD-10 Guide
DiagnosesStable Angina

Stable Angina

ICD-10 Coding for Stable Angina(I25.118, I20.8)

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

Diagnosis Overview

What is Stable Angina?
Essential facts and insights about Stable Angina

Key Clinical Considerations:

  • Chest pain or discomfort during physical exertion or stress
  • Relief of symptoms with rest or nitroglycerin
  • Symptoms typically last less than 15 minutes

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of angina episodes
  • Description of symptom characteristics (duration, triggers)
  • Results of stress tests or imaging studies

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Use I20.9 for unspecified angina; I20.8 for specific types.
  • Common errors: Misclassifying stable angina as unstable angina (I20.0).

Code Exclusions

Important Exclusions

  • Excluded conditions: Unstable angina (I20.0), myocardial infarction (I21.x).
  • Alternative codes: Consider I25.10 for stable angina due to coronary artery disease.

Related ICD-10 Codes

Primary Codes
I20.9
Angina pectoris, unspecified
I20.8
Other forms of angina pectoris
Ancillary Codes
E78.00
Differential Codes
I20.8
I25.118

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Patient populations: Adults with known coronary artery disease.
  • Clinical settings: Outpatient cardiology clinics, emergency departments.

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 frequency, duration, and triggers of angina episodes.

Billing considerations?

Ensure accurate coding to reflect the severity and type of angina for appropriate reimbursement.