G90.B
BillableLMNB1-related autosomal dominant leukodystrophy
HCC Category Mapping
V28HCC 200 — Cerebellar Ataxia and Other Degenerative Diseases of Nervous System
0.262What This Code Means
LMNB1-related autosomal dominant leukodystrophy is a rare genetic disorder affecting the white matter of the brain, caused by mutations in the LMNB1 gene.
Coding Tips
- •Genetic testing confirmation should be documented in the medical record
- •This is a rare disease; ensure genetic counseling and specialized neurology involvement is documented
Clinical Significance
LMNB1-related autosomal dominant leukodystrophy is a rare inherited white matter disease caused by duplication of the LMNB1 gene, leading to progressive demyelination of the central nervous system. It typically presents in the fourth or fifth decade of life with autonomic dysfunction, cerebellar ataxia, and pyramidal signs. This is a significant risk adjustment code given the progressive neurological deterioration and high care needs.
Documentation Requirements
- ✓Genetic testing confirming LMNB1 gene duplication
- ✓MRI findings demonstrating progressive white matter changes consistent with leukodystrophy
- ✓Neurological examination documenting pyramidal signs, cerebellar dysfunction, and autonomic abnormalities
- ✓Family history of autosomal dominant inheritance pattern
- ✓Current functional status and neurological progression documentation
Commonly Confused Codes
G93.44 — Adult-onset leukodystrophy with axonal spheroids: different genetic basis (CSF1R gene), different pathologyG93.42 — Megalencephalic leukoencephalopathy with subcortical cysts: typically childhood onset, different genetic causeG35 — Multiple sclerosis: acquired demyelinating disease with relapsing-remitting pattern, not hereditaryE75.25 — Metachromatic leukodystrophy: different enzyme deficiency (arylsulfatase A), different inheritance pattern
Code Hierarchy
└G90Disorders of autonomic nervous system└G90.BLMNB1-related autosomal dominant leukodystrophy
└G90.BLMNB1-related autosomal dominant leukodystrophy