ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
DiagnosesAcute Myocardial Infarction

Acute Myocardial Infarction

ICD-10 Coding for Heart Attack(I21.01, I21.A1)

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

Diagnosis Overview

What is Acute Myocardial Infarction?
Essential facts and insights about Heart Attack

Key Clinical Considerations:

  • Chest pain or discomfort, often radiating to the arm, jaw, or back
  • Elevated troponin levels, ST-segment elevation on ECG
  • Decreased heart sounds, possible S3 or S4 gallop

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including risk factors and presenting symptoms
  • Use of terms like 'STEMI' or 'NSTEMI' for specificity
  • Examples: 'Patient presented with chest pain and elevated troponin levels consistent with AMI.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Differentiate between STEMI and NSTEMI for accurate coding.
  • Common errors: Misclassifying the type of myocardial infarction or omitting key diagnostic findings.

Code Exclusions

Important Exclusions

  • Excluded conditions: Unstable angina, chronic ischemic heart disease.
  • Alternative codes: I20.0 for unstable angina, I25.10 for atherosclerotic heart disease.

Related ICD-10 Codes

Primary Codes
I21.9
Acute Myocardial Infarction, Unspecified
I21.01
ST Elevation Myocardial Infarction of Anterior Wall
I21.09
ST Elevation Myocardial Infarction of Other Sites
Ancillary Codes
I24.8
I21
.
I97.190
Differential Codes
I21.4
I21.01

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Patient populations: Adults with risk factors such as hypertension, diabetes, or smoking.
  • Clinical settings: Emergency departments, cardiology clinics, and 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 myocardial infarction, symptoms, and diagnostic test results.

Billing considerations?

Ensure accurate coding to reflect the type of AMI for appropriate reimbursement.