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R41.82 — Altered mental status, unspecified
R41.82
What this code means
Altered mental status is a change in awareness, alertness or thinking from a person's baseline, cause not specified.
Also called: altered mental status, ams.
When this code is used
Used for altered mental status, unspecified.
Where it sits in ICD-10-CM
Code R41.82 belongs to Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, which covers codes R00–R99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Frequently asked questions
What is ICD-10-CM code R41.82?
R41.82 is the ICD-10-CM diagnosis code for “Altered mental status, unspecified”. Altered mental status is a change in awareness, alertness or thinking from a person's baseline, cause not specified.
When is code R41.82 used?
Used for altered mental status, unspecified. It belongs to Chapter 18 of ICD-10-CM (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.