Billable / Specific Code
ICD-10-CM I20.81 is the diagnosis code for Angina pectoris with coronary microvascular dysfunction. This code falls under the section "Ischemic heart diseases" within Chapter 9 — Diseases of the circulatory system (I00-I99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where I20.81 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, I20.81 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
I20.81 is the ICD-10-CM diagnosis code for "Angina pectoris with coronary microvascular dysfunction". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of I20.81 is I20.8 ("Other forms of angina pectoris"). I20.81 provides a more specific classification within this category.
I20.81 is located in Section I20-I25 — "Ischemic heart diseases" within Chapter 9 of the ICD-10-CM Tabular List.
Use I20.81 when the patients documented diagnosis matches "Angina pectoris with coronary microvascular dysfunction" 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 with coronary microvascular dysfunction is I20.81.
Yes, I20.81 can be used as a primary diagnosis code since it is billable and specific.
I20.81 is in Chapter 9 of the ICD-10-CM Tabular List.
Yes, I20.81 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.