2026 ICD-10-CM Diagnosis Code R41.82Altered mental status, unspecified
ICD-10-CM Codes›R00–R99›R40-R46›R41
- Billable — Valid for Submission
- Not Chronic
R41.82 is a billable ICD-10-CM diagnosis code for altered mental status, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 947 through 948. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system signs and symptoms.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Altered mental status
- Character trait finding of level of suggestibility
- Disturbance in suggestibility
- Disturbance of consciousness
- Drugged state
- Grayout
- Hypnotic state
- Mental health impairment
- Narcosis
- Sedated
- Semiconscious
- Transient altered mental status
- Vacant episode
- Whiteout
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Change in mental status NOS
Type 1 Excludes
- altered level of consciousness R40
- altered mental status due to known condition - code to condition
- delirium NOS R41.0
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- mental status - R41.82
- Change (s) (in) (of) - See Also: Removal;
- mental status - R41.82
- Symptoms NEC - R68.89
- altered mental status - R41.82
- altered mental status - R41.82
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Alteration(of), Altered
- mental status
- Change(s) (in) (of)
- mental status
- Symptoms NEC
- involving
- awareness
- altered mental status
- Symptoms NEC
- involving
- cognitive functions
- altered mental status
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Mental Disorders
Mental disorders (or mental illnesses) are conditions that affect your thinking, feeling, mood, and behavior. They may happen over a short period of time or come and go. Some can be chronic (long-lasting). They can affect your ability to relate to others and function each day..
The full article covers:
- What are mental disorders?
- What are some types of mental disorders?
- What causes mental disorders?
- Who is at risk for mental disorders?
- How are mental disorders diagnosed?
- What are the treatments for mental disorders?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert R41.82 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About R41.82Overview
Is R41.82 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report altered mental status, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does R41.82 group to?
When altered mental status, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 947, 948, with relative weights from 0.8005 to 1.2694 depending on complications. Higher weights mean higher Medicare reimbursement.
Can R41.82 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the altered mental status, unspecified is established, that condition takes the principal position instead.
What is the ICD-9 equivalent of R41.82?
Under the General Equivalence Mappings, altered mental status, unspecified converts to ICD-9-CM 780.97 (altered mental status). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
