ICD-10-CM 2027
ICD-10 code for Semicoma
From the official ICD-10-CM alphabetic index entry “Semicoma”. Page updated September 29, 2026.
About coding Semicoma
The ICD-10-CM code for Semicoma is R40.1 (Stupor).
Within R40 (Somnolence, stupor and coma), R40.1 is specifically for stupor. Related codes cover Somnolence (R40.0), coma (R40.2), persistent vegetative state (R40.3) and transient alteration of awareness (R40.4).
Don't report R40.1 together with the conditions in its Excludes1 note: catatonic schizophrenia (F20.2), coma (R40.2-), depressive stupor (F31.-, F32.-, F33.-), dissociative stupor (F44.2) and 1 more.
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 R40.1)
Common questions about Semicoma ICD-10 codes
What is the ICD-10 code for Semicoma?
- R40.1 — Stupor.
Is R40.1 billable?
- Yes. R40.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R40.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R40.1 as a principal diagnosis.
Is R40.1 a CC or MCC?
- No. R40.1 is neither a CC nor an MCC under MS-DRG v44.0.