ICD-10-CM 2027
ICD-10 code for neurocognitive disorder
Unspecified symptoms and signs involving cognitive functions and awareness
From the official ICD-10-CM alphabetic index entry “Disorder (of) › neurocognitive”. Page updated September 29, 2026.
About coding neurocognitive disorder
The ICD-10-CM code for neurocognitive disorder is R41.9 (Unspecified symptoms and signs involving cognitive functions and awareness). The official index lists 8 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R41.9.
Within R41, choose R41.9 (Unspecified symptoms and signs involving cognitive functions and awareness) only when documentation doesn't support a more specific option: Disorientation, unspecified (R41.0), Anterograde amnesia (R41.1), retrograde amnesia (R41.2), other amnesia (R41.3), neurologic neglect syndrome (R41.4) and other symptoms and signs involving cognitive functions and awareness (R41.8).
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 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific neurocognitive disorder codes (official index)
- with Lewy bodies G31.83 — Neurocognitive disorder with Lewy bodies
- frontotemporal, specified NEC G31.09 — Other frontotemporal neurocognitive disorder
- major F03 — Unspecified dementia
- due to vascular disease
- mild
- moderate
- severe
- in (due to) (other diseases classified elsewhere) F02.80 — Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
- with
- aggressive behavior F02.81 — Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance
- combative behavior F02.81 — Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance
- violent behavior F02.81 — Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance
- mild (of uncertain or unknown etiology) G31.84 — Mild cognitive impairment of uncertain or unknown etiology
Common questions about neurocognitive disorder ICD-10 codes
What is the ICD-10 code for neurocognitive disorder?
- R41.9 — Unspecified symptoms and signs involving cognitive functions and awareness. More specific codes apply when the documentation supports them: G31.83, G31.09, F03, F02.80 and others below.
What is the ICD-10 code for major neurocognitive disorder?
- F03 — Unspecified dementia (header code; choose a more specific subcode).
What is the ICD-10 code for mild neurocognitive disorder?
- G31.84 — Mild cognitive impairment of uncertain or unknown etiology.
Is R41.9 billable?
- Yes. R41.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R41.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R41.9 as a principal diagnosis.
Is R41.9 a CC or MCC?
- No. R41.9 is neither a CC nor an MCC under MS-DRG v44.0.