Degenerative disease of nervous system, unspecified
Billable / specific
G31.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Excludes2
Not included here — may be reported together when both conditions exist.
- certain conditions originating in the perinatal period (P04-P96) (from G31)
- certain infectious and parasitic diseases (A00-B99) (from G31)
- complications of pregnancy, childbirth and the puerperium (O00-O9A) (from G31)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) (from G31)
- endocrine, nutritional and metabolic diseases (E00-E88) (from G31)
- injury, poisoning and certain other consequences of external causes (S00-T88) (from G31)
- neoplasms (C00-D49) (from G31)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from G31)
- Reye's syndrome (G93.7) (from G31)
Use additional code
Add a code to identify the following, if applicable.
- code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify: (from G31)
- dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4) (from G31)
- dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-) (from G31)
- dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3) (from G31)
- dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2) (from G31)
- dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0) (from G31)
- mild neurocognitive disorder due to known physiological condition (F06.7-) (from G31)
Also known as
- Atrophy, atrophic, brain
- Degeneration, degenerative, brain
- Degeneration, degenerative, brain, childhood
- Degeneration, degenerative, cerebellar NOS
- Degeneration, degenerative, nervous system
- Hemiatrophy, cerebellar
Parent code
- G31Other degenerative diseases of nervous system, not elsewhere classifiedHeader