G31.09 Other frontotemporal neurocognitive disorder

Billable ICD-10-CM code, FY2026.

Applicable to

• Frontal dementia

Use additional code

• code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)

Applies from G31 Other degenerative diseases of nervous system, not elsewhere classified

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-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 127 — Dementia, Mild or Unspecified
• RxHCC V08: HCC 112 — Dementia, Except Alzheimer's Disease
• ESRD V24: HCC 52

MS-DRG index

Defines the logic of DRG(s) 056-057 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 331.19 Other frontotemporal dementia

Code annotations containing back-references to G31.09

Back-references to G31.09

• Code First: F02 Dementia in other diseases classified elsewhere ("frontotemporal dementia (G31.09)")
• Code First: F06.7 Mild neurocognitive disorder due to known physiological condition ("other frontotemporal neurocognitive disorder (G31.09)")

Back-references to G31.0

• Use Additional: G31 Other degenerative diseases of nervous system, not elsewhere classified ("code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:")

Diagnosis Index entries for G31.09

• Atrophy, atrophic (of) › sclerosis, lobar (of brain)
• Atrophy, atrophic (of) › sclerosis, lobar (of brain) › with behavioral disturbance
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › frontal (lobe)
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › frontal (lobe) › with behavioral disturbance
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › frontotemporal
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › frontotemporal › with behavioral disturbance
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › frontotemporal › specified NEC
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › frontotemporal › specified NEC › with behavioral disturbance
• Disorder (of) › neurocognitive › frontotemporal, specified NEC

Nearby codes

• 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 (this code)
• 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