Mild cognitive impairment of uncertain or unknown etiology
Billable / specific
G31.84 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Inclusion terms
Applicable to
- Mild cognitive disorder NOS
- Mild neurocognitive disorder of uncertain or unknown etiology
Excludes1
Not coded here — never report together with this code.
- age related cognitive decline (R41.81)
- altered mental status (R41.82)
- cerebral degeneration (G31.9)
- cerebrovascular diseases (I60-I69)
- change in mental status (R41.82)
- cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-, I69.11-, I69.21-, I69.31-, I69.81-, I69.91-)
- cognitive impairment due to intracranial or head injury (S06.-)
- dementia (F01.-, F02.-, F03.-)
- mild neurocognitive disorder due to a known physiological condition (F06.7-)
- neurologic neglect syndrome (R41.4)
- personality change, nonpsychotic (F68.8)
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 to identify presence of:
- alcohol abuse and dependence (F10.-)
- exposure to environmental tobacco smoke (Z77.22)
- history of tobacco dependence (Z87.891)
- hypertension (I10-I1A)
- occupational exposure to environmental tobacco smoke (Z57.31)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
- 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
- Mild cognitive disorder NOS
- Mild neurocognitive disorder of uncertain or unknown etiology
- Disorder, mild neurocognitive
- Disorder, neurocognitive, mild
- Impaired, impairment, cognitive, mild, of uncertain or unknown etiology
- Impaired, impairment, mild cognitive
- Impaired, impairment, mild cognitive, of uncertain or unknown etiology
Parent code
- G31.8Other specified degenerative diseases of nervous systemHeader
Related codes
- G31.80Leukodystrophy, unspecifiedBillable
- G31.81Alpers diseaseBillable
- G31.82Leigh's diseaseBillable
- G31.83Neurocognitive disorder with Lewy bodiesBillable
- G31.85Corticobasal degenerationBillable
- G31.86Alexander diseaseBillable
- G31.87Primary progressive apraxia of speechBillable
- G31.89Other specified degenerative diseases of nervous systemBillable