G31.84
Mild cognitive impairment of uncertain or unknown etiology
Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 20 never code together
G31.84code
Excludes1
- age related cognitive decline (R41.81)R41.81
- altered mental status (R41.82)R41.82
- cerebral degeneration (G31.9)G31.9
- cerebrovascular diseases (I60-I69)I60-I69
- change in mental status (R41.82)R41.82
- cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-, I69.11-, I69.21-, I69.31-, I69.81-, I69.91-)I69.01-I69.11-I69.21-I69.31-I69.81-I69.91-
- cognitive impairment due to intracranial or head injury (S06.-)S06.-
- dementia (F01.-, F02.-, F03.-)F01.-F02.-F03.-
- mild neurocognitive disorder due to a known physiological condition (F06.7-)F06.7-
- neurologic neglect syndrome (R41.4)R41.4
- personality change, nonpsychotic (F68.8)F68.8
G00-G99chapter
Excludes2
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 17
G31code
Use additional code
- code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:G31.0-G31.83G31.85-G31.9
- dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)F02.84F02.A4F02.B4F02.C4
- dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)F02.81-F02.A1-F02.B1-F02.C1-
- dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)F02.83F02.A3F02.B3F02.C3
- dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)F02.82F02.A2F02.B2F02.C2
- dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)F02.80F02.A0F02.B0F02.C0
- mild neurocognitive disorder due to known physiological condition (F06.7-)F06.7-
G31.84code
Inclusion terms
- Mild cognitive disorder NOS
- Mild neurocognitive disorder of uncertain or unknown etiology
Use additional code
- code to identify presence of:
- alcohol abuse and dependence (F10.-)F10.-
- exposure to environmental tobacco smoke (Z77.22)Z77.22
- history of tobacco dependence (Z87.891)Z87.891
- hypertension (I10-I1A)I10-I1A
- occupational exposure to environmental tobacco smoke (Z57.31)Z57.31
- tobacco dependence (F17.-)F17.-
- tobacco use (Z72.0)Z72.0
Index entries leading here 2
Alongside this code 8 same parent — G31.8
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.