2026 ICD-10-CM Diagnosis Code R46.4Slowness and poor responsiveness
ICD-10-CM Codes›R00–R99›R40-R46›R46
- Billable — Valid for Submission
- Not Chronic
R46.4 is a billable ICD-10-CM diagnosis code for slowness and poor responsiveness. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 951. 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 Symptoms of mental and substance use conditions.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Slowness and poor responsiveness
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- stupor R40.1
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.
poor responsiveness R46.4
slowness R46.4
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert R46.4 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About R46.4Overview
What is the ICD-10 code for slowness and poor responsiveness?
The ICD-10-CM code for slowness and poor responsiveness is R46.4 (sometimes written as R464). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is R46.4 (Symptoms and signs involving appearance and behavior) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report slowness and poor responsiveness on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does R46.4 group to?
When slowness and poor responsiveness is the principal diagnosis on an inpatient stay, it groups to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.556. Higher weights mean higher Medicare reimbursement.
Can R46.4 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the slowness and poor responsiveness is established, that condition takes the principal position instead.
What is the ICD-9 equivalent of R46.4?
Under the General Equivalence Mappings, slowness and poor responsiveness converts to ICD-9-CM 799.89 (ill-define condition NEC). The mapping is approximate, so confirm the match fits the documentation.
