What is the ICD-10-CM code for altered mental status?

The primary ICD-10-CM code for altered mental status is R41.82 (Altered mental status, unspecified). There are 12 billable altered mental status codes in FY2027, covering different types and underlying causes.

How many ICD-10-CM codes are there for altered mental status?

There are 12 ICD-10-CM codes for altered mental status in the FY2027 tabular list, of which 12 are billable. These codes fall under Chapter 18 of the ICD-10-CM classification.

Which chapter covers altered mental status in ICD-10-CM?

Altered Mental Status codes are classified in Chapter 18 of the ICD-10-CM tabular list: R00–R99 (Symptoms, Signs and Abnormal Clinical and Laboratory Findings).

Altered Mental Status ICD-10-CM codes

ICD-10-CM codes for altered mental status (AMS), confusion, disorientation, somnolence, stupor, and coma, with related codes for delirium and encephalopathy.

12 codes, 12 billable. FY2027, valid from October 1, 2026. In chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings.

How to code Altered Mental Status

R41.82 is altered mental status, unspecified, the code for AMS or change in mental status with no further detail. Confusion and disorientation are R41.0. Somnolence (drowsiness) is R40.0, stupor is R40.1, transient alteration of awareness is R40.4, and unspecified coma is R40.20. Glasgow coma scale scores are reported from R40.2- in addition when documented.

R41.82 has an Excludes1 note for delirium. Delirium due to a medical condition is F05, with the underlying condition coded first. Alcohol withdrawal delirium is F10.231. When the cause of the mental status change is diagnosed, code that cause instead of R41.82, for example metabolic encephalopathy G93.41, toxic encephalopathy G92.8, hyponatremia E87.1, or hypoglycemia E16.2.

All Altered Mental Status codes

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