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R40

Non-billable

Somnolence, stupor and coma

R40 is the ICD-10-CM code for Somnolence, stupor and coma. It is a non-billable category code — use a more specific child code such as R40.0 for billing.

Status
Header (non-billable)
Chapter
R00-R99
Subcodes
5
Edition
FY2026

R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

Excludes1 — not coded here

  • •neonatal coma (P91.5)
  • •somnolence, stupor and coma in diabetes (E08-E13)
  • •somnolence, stupor and coma in hepatic failure (K72.-)
  • •somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15)

Frequently asked questions

What is ICD-10 code R40?
R40 is the ICD-10-CM code for "Somnolence, stupor and coma". It falls under R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
Is R40 a billable code?
No — R40 is a non-billable header code. Use a more specific child code (such as R40.0) for billing.
What are the subcodes of R40?
R40 has 5 more specific child codes, including R40.0, R40.1, R40.2.
What is excluded from R40?
Excludes1 (not coded here): neonatal coma (P91.5); somnolence, stupor and coma in diabetes (E08-E13); somnolence, stupor and coma in hepatic failure (K72.-); somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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