A81.82

HCC Category Mapping

What This Code Means

Gerstmann-Sträussler-Scheinker syndrome is a rare, inherited brain disease that causes progressive dementia, loss of coordination, and tremors due to abnormal protein buildup in the brain. It is a fatal neurodegenerative condition that typically develops in middle age and progresses over several years.

Coding Tips

• •This is a prion disease requiring documentation of family history and genetic testing confirmation; verify the diagnosis is clearly documented in the medical record before coding
• •Code A81.82 is specific to GSS syndrome; do not confuse with other prion diseases like Creutzfeldt-Jakob disease (A81.0) or fatal familial insomnia (A81.83)

Clinical Significance

Gerstmann-Straussler-Scheinker syndrome is a rare hereditary prion disease caused by PRNP gene mutations, characterized by progressive cerebellar ataxia and later dementia. It has a slower course than CJD (2-10 years survival) and is inherited in an autosomal dominant pattern, making genetic counseling essential.

Documentation Requirements

• ✓Genetic testing confirming PRNP gene mutation (most commonly P102L mutation)
• ✓Family history documenting autosomal dominant inheritance pattern
• ✓Clinical findings: progressive cerebellar ataxia, dysarthria, cognitive decline
• ✓Neuroimaging results showing cerebellar and cerebral atrophy
• ✓Disease stage and functional status documentation

Commonly Confused Codes