ICD-10-CM 2027
ICD-10 code for lewy body
From the official ICD-10-CM alphabetic index entry “Lewy body (ies) (disease)”. Page updated September 29, 2026.
About coding lewy body
The ICD-10-CM code for lewy body is G31.83 (Neurocognitive disorder with Lewy bodies).
Within G31.8 (other specified degenerative diseases of nervous system), G31.83 is specifically for neurocognitive disorder with Lewy bodies. Related codes cover leukodystrophy, unspecified (G31.80), Alpers disease (G31.81), Leigh's disease (G31.82), mild cognitive impairment of uncertain or unknown etiology (G31.84), Corticobasal degeneration (G31.85), Alexander disease (G31.86), primary progressive apraxia of speech (G31.87) and other specified degenerative diseases of nervous system (G31.89).
Use an additional code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-). Use an additional 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) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about lewy body ICD-10 codes
What is the ICD-10 code for lewy body?
- G31.83 — Neurocognitive disorder with Lewy bodies.
Is G31.83 billable?
- Yes. G31.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G31.83 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G31.83 as a principal diagnosis.
Is G31.83 a CC or MCC?
- No. G31.83 is neither a CC nor an MCC under MS-DRG v44.0.