ICD-10-CM 2027 diagnosis code
G31.01Pick's disease
G31.01 is a valid, billable ICD-10-CM code for pick's disease. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Pick's disease.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About G31.01
G31.01 is the ICD-10-CM diagnosis code for Pick's disease. It belongs to category G31 (other degenerative diseases of nervous system, not elsewhere classified), block G30-G32 (other degenerative diseases of the nervous system) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within G31.0 (frontotemporal dementia), G31.01 is specifically for Pick's disease. Related codes cover other frontotemporal neurocognitive disorder (G31.09).
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.
In MS-DRG v44.0, it is part of the grouping logic for DRG 056 (Degenerative Nervous System Disorders with MCC, relative weight 2.2655) and DRG 057 (Degenerative Nervous System Disorders without MCC, relative weight 1.2838), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 331.11 (Pick's disease).
Coding notes
- Primary progressive aphasia
- Progressive isolated aphasia
Notes that apply from higher levels
Instructions written at a parent level also apply to G31.01.
› From G31 Other degenerative diseases of nervous system, not elsewhere classified
- Reye's syndrome (G93.7)
- 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-)
Broader instructions also apply from Chapter 6: Diseases of the nervous system.
Alphabetic index entries
20 entriesTerms in the official ICD-10-CM index that lead to G31.01.
- Aphasia (amnestic) (global) (nominal) (semantic) (syntactic) › primary progressive
- Aphasia (amnestic) (global) (nominal) (semantic) (syntactic) › primary progressive › with behavioral disturbance
- Aphasia (amnestic) (global) (nominal) (semantic) (syntactic) › progressive isolated
- Aphasia (amnestic) (global) (nominal) (semantic) (syntactic) › progressive isolated › with behavioral disturbance
- Atrophy, atrophic (of) › brain (cortex) (progressive) › frontotemporal circumscribed
- Atrophy, atrophic (of) › brain (cortex) (progressive) › frontotemporal circumscribed › with behavioral disturbance
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › in (due to) › Pick's
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › in (due to) › Pick's › with behavioral disturbance
- Disease, diseased › Pick's
- Disease, diseased › Pick's › with behavioral disturbance
- Disease, diseased › Pick's › brain
- Disease, diseased › Pick's › brain › with behavioral disturbance
- Pick's › cerebral atrophy
- Pick's › cerebral atrophy › with behavioral disturbance
- Pick's › disease or syndrome (brain)
- Pick's › disease or syndrome (brain) › with behavioral disturbance
- Pick's › disease or syndrome (brain) › brain
- Pick's › disease or syndrome (brain) › brain › with behavioral disturbance
- Pick's › syndrome › brain
- Pick's › syndrome › brain › with behavioral disturbance
Codes whose notes reference G31.01
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 01 · Diseases and Disorders of the Nervous System
ICD-9-CM equivalent
Converter →- 331.11Pick's diseaseexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about G31.01
Is G31.01 billable?
- Yes. G31.01 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G31.01 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G31.01 as a principal diagnosis.
Is G31.01 a CC or MCC?
- No. G31.01 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does G31.01 group to?
- G31.01 is used in the MS-DRG v44.0 logic for MS-DRG 056 (Degenerative Nervous System Disorders with MCC) and MS-DRG 057 (Degenerative Nervous System Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for G31.01?
- The CMS General Equivalence Mappings map G31.01 to ICD-9-CM 331.11.