ICD-10-CM A81.83 is the diagnosis code for Fatal familial insomnia. This code falls under the section "Viral and prion infections of the central nervous system" within Chapter 1 — Certain infectious and parasitic diseases (A00-B99). 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 A81.83 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, A81.83 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
A81.83 is the ICD-10-CM diagnosis code for "Fatal familial insomnia". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of A81.83 is A81.8 ("Other atypical virus infections of central nervous system"). A81.83 provides a more specific classification within this category.
A81.83 is located in Section A80-A89 — "Viral and prion infections of the central nervous system" within Chapter 1 of the ICD-10-CM Tabular List.
Use A81.83 when the patients documented diagnosis matches "Fatal familial insomnia" 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 Fatal familial insomnia is A81.83.
Yes, A81.83 can be used as a primary diagnosis code since it is billable and specific.
A81.83 is in Chapter 1 of the ICD-10-CM Tabular List.
Yes, A81.83 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.