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ICD-10-CM Current in FY 2027

G31.9

Degenerative disease of nervous system, unspecified

Release
FY 2027
Effective
Official source (opens in a new tab)

Hierarchy

Where G31.9 sits in the official hierarchy. Each level is the code it is classified under.

  1. G31 Parent Other degenerative diseases of nervous system, not elsewhere classified
  2. G31.9 This code Degenerative disease of nervous system, unspecified

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

Excludes2

Reye's syndrome ( G93.7 )

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

Use Additional Code

code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:

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

Use Additional Code

dementia with anxiety ( F02.84 , F02.A4 , F02.B4 , F02.C4 )

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

Use Additional Code

dementia with behavioral disturbance ( F02.81- , F02.A1- , F02.B1- , F02.C1- )

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

Use Additional Code

dementia with mood disturbance ( F02.83 , F02.A3 , F02.B3 , F02.C3 )

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

Use Additional Code

dementia with psychotic disturbance ( F02.82 , F02.A2 , F02.B2 , F02.C2 )

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

Use Additional Code

dementia without behavioral disturbance ( F02.80 , F02.A0 , F02.B0 , F02.C0 )

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

Use Additional Code

mild neurocognitive disorder due to known physiological condition ( F06.7- )

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

Version History

How G31.9 appears in each release imported from the official files, newest first.

  1. FY 2027 Effective

    Current

    Degenerative disease of nervous system, unspecified

  2. FY 2026 Effective

    Unchanged

    Degenerative disease of nervous system, unspecified

Related Codes

Other codes under G31

Codes whose official notes reference G31.9

Data Source

Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.

Release
FY 2027
Effective
Source file
icd10cm-code-descriptions-2027.zip

Official ICD-10-CM source files (opens in a new tab)

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