A81.09

Billable

Other Creutzfeldt-Jakob disease

HCC Category Mapping

V28HCC 127 — Dementia, Mild or Unspecified

0.464

RxHCCHCC 112 — Dementia and Other Specified Brain Disorders

0.000

What This Code Means

This is a rare, rapidly progressive brain disease that causes severe dementia and loss of brain function, similar to Creutzfeldt-Jakob disease but not fitting the typical presentation. It is caused by abnormal proteins called prions and is always fatal.

Coding Tips

•Verify the specific type of CJD documented in the medical record, as code A81.09 is used only when the CJD variant doesn't fit other specified categories (A81.00, A81.01, A81.02)
•This is a reportable disease in most jurisdictions; ensure proper documentation and reporting requirements are met per local health department guidelines

Clinical Significance

This code captures CJD subtypes not classified as unspecified or variant, including sporadic CJD (the most common form, ~85% of cases), familial CJD, and iatrogenic CJD from contaminated surgical instruments or transplants. Proper subtype identification is critical for epidemiological surveillance and family counseling.

Documentation Requirements

✓Specific CJD subtype documented (sporadic, familial, iatrogenic)
✓Genetic testing results for familial CJD (PRNP gene mutation)
✓For iatrogenic CJD: source of exposure (dura mater graft, corneal transplant, growth hormone, contaminated instruments)
✓Diagnostic criteria and confirmatory testing results
✓Family history of prion disease if familial subtype is suspected

Commonly Confused Codes

A81.00 (Creutzfeldt-Jakob disease, unspecified) — Use A81.00 only when the subtype cannot be determined; A81.09 indicates a known subtype that is not the variant form A81.01 (Variant Creutzfeldt-Jakob disease) — vCJD is BSE-related; A81.09 covers other specific subtypes A81.82 (Gerstmann-Straussler-Scheinker syndrome) — Another familial prion disease but with distinct clinical features (cerebellar ataxia predominates over dementia)