G30Alzheimer's disease

G30 is the ICD-10-CM diagnosis code for Alzheimer's disease. It belongs to block G30-G32 (other degenerative diseases of the nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G30.0 (with early onset), G30.1 (with late onset), G30.8 (disease) and G30.9 (unspecified).

Don't report G30 together with the conditions in its Excludes1 note: senile degeneration of brain NEC (G31.1), senile dementia NOS (F03.-) and senility NOS (R41.81).

Use an additional code, if applicable, to identify: delirium, if applicable (F05), 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) and 2 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.