Diseases of the Circulatory System
ICD-10 Code: I20.9
Angina Pectoris, Unspecified
Chest pain or discomfort caused by reduced blood flow to the heart muscle, unspecified type.
Clinical Information
Chest pain or discomfort caused by reduced blood flow to the heart muscle, unspecified type. Common in US healthcare settings with specific coding requirements per ICD-10-CM guidelines.
Coding Guidelines
- 1Use I20.9 when clinical documentation supports this diagnosis
- 2Verify specificity requirements per ICD-10-CM Official Guidelines
- 3Code to highest level of specificity documented
- 4Consider associated conditions and combination coding rules
Common Uses
- Primary diagnosis in ambulatory settings
- Secondary diagnosis in inpatient settings
- ED/urgent care encounters
- Follow-up and monitoring visits
Related ICD-10 Codes
I20.XRelated code in same category
See ICD-10-CM manualFor complete related code list
Documentation Requirements
- Physician documentation must clearly state diagnosis
- Include severity, laterality, and specificity when applicable
- Document underlying cause if known
- Note acute vs. chronic where relevant
Real-World Coding Examples
Patient presents with angina pectoris, unspecified. Clinical findings support I20.9 diagnosis.
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