ICD-10-CM R40: Somnolence, stupor and coma

ICD-10-CM Diagnosis Code (2025)

Official Description for R40

Somnolence, stupor and coma

Coding Notes & Guidelines for 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)
Excludes1: Not Coded Here

coma (R40.2-)

Excludes1: Not Coded Here
  • catatonic schizophrenia (F20.2)
  • coma (R40.2-)
  • depressive stupor (F31-F33)
  • dissociative stupor (F44.2)
  • manic stupor (F30.2)
Code First
  • any associated:
  • fracture of skull (S02.-)
  • intracranial injury (S06.-)
Code First

underlying condition

Inclusion Terms

Drowsiness

Inclusion Terms
  • Catatonic stupor
  • Semicoma
Inclusion Terms
  • Coma NOS
  • Unconsciousness NOS
Inclusion Terms

Coma scale eye opening score of 1

Inclusion Terms

Coma scale eye opening score of 2

Inclusion Terms

Coma scale eye opening score of 3

Inclusion Terms

Coma scale eye opening score of 4

Inclusion Terms

Coma scale verbal score of 1

Inclusion Terms
  • Coma scale verbal score of 2
  • Incomprehensible sounds (2-5 years of age)
  • Moans/grunts to pain
  • restless (<2 years old)
Inclusion Terms
  • Coma scale verbal score of 3
  • Inappropriate crying or screaming (< 2 years of age)
  • Screaming (2-5 years of age)
Inclusion Terms
  • Coma scale verbal score of 4
  • Inappropriate words (2-5 years of age)
  • Irritable cries (< 2 years of age)
Inclusion Terms
  • Coma scale verbal score of 5
  • Cooing or babbling or crying appropriately (< 2 years of age)
  • Uses appropriate words (2- 5 years of age)
Inclusion Terms

Coma scale motor score of 1

Inclusion Terms
  • Abnormal extensor posturing to pain or noxious stimuli (< 2 years of age)
  • Coma scale motor score of 2
  • Extensor posturing to pain or noxious stimuli (2-5 years of age)
Inclusion Terms
  • Abnormal flexure posturing to pain or noxious stimuli (2-5 years of age)
  • Coma scale motor score of 3
  • Flexion/decorticate posturing (< 2 years of age)
Inclusion Terms
  • Coma scale motor score of 4
  • Withdraws from pain or noxious stimuli (2-5 years of age)
Inclusion Terms
  • Coma scale motor score of 5
  • Localizes pain (2-5 years of age)
  • Withdraws to touch (< 2 years of age)
Inclusion Terms
  • Coma scale motor score of 6
  • Normal or spontaneous movement (< 2 years of age)
  • Obeys commands (2-5 years of age)
Inclusion Terms

Secondary coma

7th Character Guidance

The following appropriate 7th character is to be added to subcategory R40.21-:

7th Character Guidance

The following appropriate 7th character is to be added to subcategory R40.22-:

7th Character Guidance

The following appropriate 7th character is to be added to subcategory R40.23-:

7th Character Guidance

The following appropriate 7th character is to be added to subcategory R40.24-:

Child Codes (More Specific Codes for R40):

About ICD-10-CM Code R40 (Somnolence)

ICD-10-CM code R40 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM R40 became effective on October 1, 2024.

This page provides detailed information about R40 - Somnolence, stupor and coma. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Somnolence related to stupor and coma.