ICD-10-CM 2027
ICD-10 code for Slowness behavior
From the official ICD-10-CM alphabetic index entry “Behavior › slowness”. Page updated September 29, 2026.
About coding Slowness behavior
The ICD-10-CM code for Slowness behavior is R46.4 (Slowness and poor responsiveness).
Within R46 (symptoms and signs involving appearance and behavior), R46.4 is specifically for Slowness and poor responsiveness. Related codes cover Very low level of personal hygiene (R46.0), Bizarre personal appearance (R46.1), Strange and inexplicable behavior (R46.2), overactivity (R46.3), Suspiciousness and marked evasiveness (R46.5), Undue concern and preoccupation with stressful events (R46.6), Verbosity and circumstantial detail obscuring reason for contact (R46.7) and other symptoms and signs involving appearance and behavior (R46.8).
Don't report R46.4 together with the conditions in its Excludes1 note: stupor (R40.1).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for R46.4)
- stupor (R40.1)
Common questions about Slowness behavior ICD-10 codes
What is the ICD-10 code for Slowness behavior?
- R46.4 — Slowness and poor responsiveness.
Is R46.4 billable?
- Yes. R46.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R46.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R46.4 as a principal diagnosis.
Is R46.4 a CC or MCC?
- No. R46.4 is neither a CC nor an MCC under MS-DRG v44.0.