Non-Billable / Non-Specific Code
ICD-10-CM I21 is the diagnosis code for Acute myocardial infarction. This code falls under the section "Ischemic heart diseases" within Chapter 9 â 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 are not included in I21. If the patient has both, code each condition separately:
Understanding where I21 sits in the ICD-10-CM classification helps ensure proper coding:
No, I21 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
I21 is the ICD-10-CM diagnosis code for "Acute myocardial infarction". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
I21 is located in Section I20-I25 â "Ischemic heart diseases" within Chapter 9 of the ICD-10-CM Tabular List.
I21 has 8 sub-code(s) that provide more specific detail: I21.0, I21.1, I21.2, I21.3, I21.4 and more.
Use I21 when the patients documented diagnosis matches "Acute myocardial infarction" 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 Acute myocardial infarction is I21.
No, I21 is non-billable. Use a more specific sub-code for primary diagnosis billing.
I21 is in Chapter 9 of the ICD-10-CM Tabular List.
Yes, I21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.