ICD-10 Code I20.1 – Angina pectoris with documented spasm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I20.1 – Angina pectoris with documented spasm
What it is
I20.1 identifies angina caused by a documented coronary artery spasm. Use it when the record shows transient vessel spasm producing chest pain or ischemic symptoms.
Clinical signs
Typical findings include episodic chest discomfort at rest, transient ischemic ECG changes, or evidence of reversible coronary spasm. Clinical features vary; refer to documentation.
When to use this code
Use I20.1 when the provider documents angina pectoris with coronary spasm, variant angina, or vasospastic angina. The documentation should clearly link the angina to spasm, not just nonspecific chest pain.
If the note only says angina without spasm, choose a more general angina code. Check documentation when the cause of symptoms is unclear or when spasm is suspected but not confirmed.
Do not use for
Do not use this code for unstable angina, chest pain without an angina diagnosis, or ischemic symptoms from another cause. Check documentation.
Coding tip
Look for explicit terms such as “documented spasm” or “vasospastic angina” before assigning I20.1.