ICD-10-CM 2027
ICD-10 code for Fatal familial FFI insomnia
From the official ICD-10-CM alphabetic index entry “Insomnia (organic) › fatal familial (FFI)”. Page updated September 29, 2026.
About coding Fatal familial FFI insomnia
The ICD-10-CM code for Fatal familial FFI insomnia is A81.83 (Fatal familial insomnia).
Within A81.8 (other atypical virus infections of central nervous system), A81.83 is specifically for Fatal familial insomnia. Related codes cover Kuru (A81.81), Gerstmann-Straussler-Scheinker syndrome (A81.82) and other atypical virus infections of central nervous system (A81.89).
Use an additional code, if applicable, to identify: dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4), dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-), dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3), dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2), dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0) and 1 more.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about Fatal familial FFI insomnia ICD-10 codes
What is the ICD-10 code for Fatal familial FFI insomnia?
- A81.83 — Fatal familial insomnia.
Is A81.83 billable?
- Yes. A81.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A81.83 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A81.83 as a principal diagnosis.
Is A81.83 a CC or MCC?
- A81.83 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.