ICD-10-CM 2027
ICD-10 code for frontal lobe dementia)
From the official ICD-10-CM alphabetic index entry “Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › frontal (lobe)”. Page updated September 29, 2026.
About coding frontal lobe dementia)
The ICD-10-CM code for frontal lobe dementia) is G31.09 (Other frontotemporal neurocognitive disorder). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G31.09.
Within G31.0, choose G31.09 (Other frontotemporal neurocognitive disorder) only when documentation doesn't support a more specific option: Pick's disease (G31.01).
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.
More specific frontal lobe dementia) codes (official index)
- with behavioral disturbance G31.09 — Other frontotemporal neurocognitive disorder
Common questions about frontal lobe dementia) ICD-10 codes
What is the ICD-10 code for frontal lobe dementia)?
- G31.09 — Other frontotemporal neurocognitive disorder. More specific codes apply when the documentation supports them: G31.09.
Is G31.09 billable?
- Yes. G31.09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G31.09 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G31.09 as a principal diagnosis.
Is G31.09 a CC or MCC?
- No. G31.09 is neither a CC nor an MCC under MS-DRG v44.0.