ICD-10-CM I20 is the diagnosis code for Angina pectoris. This code falls under the section "Ischemic heart diseases" within Chapter 9 — Diseases of the circulatory system (I00-I99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as I20. They are mutually exclusive:
Understanding where I20 sits in the ICD-10-CM classification helps ensure proper coding:
No, I20 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
I20 is the ICD-10-CM diagnosis code for "Angina pectoris". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
I20 is located in Section I20-I25 — "Ischemic heart diseases" within Chapter 9 of the ICD-10-CM Tabular List.
I20 has 5 sub-code(s) that provide more specific detail: I20.0, I20.1, I20.2, I20.8, I20.9.
Use I20 when the patients documented diagnosis matches "Angina pectoris" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Angina pectoris is I20.
No, I20 is non-billable. Use a more specific sub-code for primary diagnosis billing.
I20 is in Chapter 9 of the ICD-10-CM Tabular List.
Type 1 Excludes for I20 include: angina pectoris with atherosclerotic heart disease of native coronary arteries (I25.1-); atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7-); postinfarction angina (I23.7).
Yes, I20 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.