G31.85 is the authoritative medical code for Corticobasal degeneration. This classification is used in medical billing and clinical recording to specify the clinical criteria for corticobasal degeneration (ICD-10-CM G31.85), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Corticobasal degeneration is a billable ICD-10-CM diagnosis code G31.85. Excludes2 (not included here): Reye's syndrome G93.7. Use additional code: code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, 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); mild neurocognitive disorder due to known physiological condition F06.7-.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for G31.85 in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
Use Additional Code
Supplementary codes the tabular list directs you to add.
- code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, 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)
- mild neurocognitive disorder due to known physiological condition F06.7-
Frequently Asked Questions (FAQ) & Clinical Guidance
Can G31.85 be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, G31.85 and the following are not considered part of each other and may both be reported when both conditions are present: Reye's syndrome (G93.7).
Is an additional code needed with G31.85?
Use additional code(s) to specify: code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, 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).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to G31.85 in its code family, with their registry titles.
- G31 — Other degenerative diseases of nervous system, not elsewhere classified
- G31.0 — Frontotemporal dementia
- G31.01 — Pick's disease
- G31.09 — Other frontotemporal neurocognitive disorder
- G31.1 — Senile degeneration of brain, not elsewhere classified
- G31.2 — Degeneration of nervous system due to alcohol
- G31.8 — Other specified degenerative diseases of nervous system
- G31.80 — Leukodystrophy, unspecified
- G31.81 — Alpers disease
- G31.82 — Leigh's disease
View all 16 codes in the G31 family
Indexed Clinical Terms (1)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Degeneration, degenerative, corticobasal