ICD-10-CM
ICD-10 code for Altered mental status: R41.82
The CDC title for "Altered mental status" is R41.8 (Other symptoms and signs involving cognitive functions and awareness), a header that is not billable. When nothing more specific is documented, the billable code is R41.82, Altered mental status, unspecified.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under R41.8, then other CDC titles that name altered mental status
A header groups codes and is not billed. A billable code is one you can report.
- R41.8Other symptoms and signs involving cognitive functions and awarenessHeader
- R41.81Age-related cognitive declineBillable
- R41.82Altered mental status, unspecifiedBillable
- R41.83Borderline intellectual functioningBillable
- R41.84Other specified cognitive deficitHeader
- R41.840Attention and concentration deficitBillable
- R41.841Cognitive communication deficitBillable
- R41.842Visuospatial deficitBillable
- R41.843Psychomotor deficitBillable
- R41.844Frontal lobe and executive function deficitBillable
- R41.85AnosognosiaBillable
- R41.89Other symptoms and signs involving cognitive functions and awarenessBillable
Excludes1
Excludes1 means these codes are not reported together.
- R40.-Altered level of consciousness
- altered mental status due to known condition - code to condition
- R41.0Delirium NOS
From R41. A note on a category applies to every code under it.
Related conditions
Related pages
- R41.82 code detailsNotes, nearby codes, CMS-HCC group
- Category R41.8Every code under it
- Chapter 18Symptoms, signs and abnormal clinical findings
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Altered mental status?
The CDC title for "Altered mental status" is R41.8 (Other symptoms and signs involving cognitive functions and awareness), a header that is not billable. When nothing more specific is documented, the billable code is R41.82, Altered mental status, unspecified.
Is R41.82 billable?
Yes. R41.82 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to R41.82?
The CDC tabular list gives 5 Excludes1 notes (not coded together) for R41.82 and the categories above it. They are listed on this page.
What chapter is R41.82 in?
Chapter 18. Symptoms, signs and abnormal clinical findings.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.