2026 ICD-10-CM Diagnosis Code R41.9Unspecified symptoms and signs involving cognitive functions and awareness

ICD-10-CM Codes›R00–R99›R40-R46›R41

ICD-10-CM R41.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R41.9 is a billable ICD-10-CM diagnosis code for unspecified symptoms and signs involving cognitive functions and awareness. 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

ICD-10-CM Code
R41.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified symptoms and signs involving cognitive functions and awareness
Short Description
Unsp symptoms and signs w cognitive functions and awareness
Parent Code
R41
Other symptoms and signs involving cognitive functions and awareness

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR40-R46Symptoms and signs involving cognition, perception, emotional state and behavior
CategoryR41Other symptoms and signs involving cognitive functions and awareness
This CodeR41.9Unspecified symptoms and signs involving cognitive functions and awareness

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cognitive impairment due to lead toxicity
  • Cognitive impairment due to toxicity of substance
  • Disturbance of cognitive learning
  • Hypotonia, speech impairment, severe cognitive delay syndrome
  • Language disorder associated with thought disorder
  • Moderate cognitive impairment
  • Neurocognitive disorder
  • Postoperative cognitive dysfunction
  • Prejudice
  • Psychiatric sign
  • Psychiatric sign or symptom
  • Psychiatric symptom
  • Psychological sign
  • Psychological sign or symptom
  • Psychological symptom
  • Psychological symptom due to dementia
  • Severe cognitive impairment

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Unspecified neurocognitive disorder

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disorder(of)
      • neurocognitive
    • Lack of
      • awareness
    • Lack of
      • cognitive functions
    • Symptoms NEC
      • involving
        • awareness
    • Symptoms NEC
      • involving
        • cognitive functions

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SYM010
Nervous system signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Prejudice

    a preconceived judgment made without factual basis.

  • Racism

    differential treatment or unequal access to opportunities, based on group membership such as origin or ethnicity.

  • Weight Prejudice

    negative attitudes towards and beliefs about others because of their weight. these negative attitudes are manifested by stereotypes and/or prejudice towards people with weight over or under a cultural norm.

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 R41.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
780.99 Other general symptoms
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R41.9Overview

Is R41.9 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified symptoms and signs involving cognitive functions and awareness on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R41.9 group to?

When unspecified symptoms and signs involving cognitive functions and awareness 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 R41.9 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the unspecified symptoms and signs involving cognitive functions and awareness is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R41.9?

Under the General Equivalence Mappings, unspecified symptoms and signs involving cognitive functions and awareness converts to ICD-9-CM 780.99 (other general symptoms). 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.