ICD-10-CM I48.21 is the diagnosis code for Permanent atrial fibrillation. This code falls under the section "Other forms of heart disease" 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.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where I48.21 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, I48.21 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
I48.21 is the ICD-10-CM diagnosis code for "Permanent atrial fibrillation". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of I48.21 is I48.2 ("Chronic atrial fibrillation"). I48.21 provides a more specific classification within this category.
I48.21 is located in Section I30-I5A — "Other forms of heart disease" within Chapter 9 of the ICD-10-CM Tabular List.
Use I48.21 when the patients documented diagnosis matches "Permanent atrial fibrillation" 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 Permanent atrial fibrillation is I48.21.
Yes, I48.21 can be used as a primary diagnosis code since it is billable and specific.
I48.21 is in Chapter 9 of the ICD-10-CM Tabular List.
Yes, I48.21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.