ICD-10 Code for Coma

The default ICD-10-CM 2027 code for coma is R40.20 – Unspecified coma. More specific codes depend on the details documented, as listed in the official index (22 codes, 6 billable).

Main code: R40.20 – Unspecified coma
Billable: Yes

Index entries for Coma

with
- motor response (none) – R40.231 (header)
  - abnormal – R40.233 (header)
  - abnormal extensor posturing to pain or noxious stimuli (< 2 years of age) – R40.232 (header)
  - abnormal flexure posturing to pain or noxious stimuli (0-5 years of age) – R40.233 (header)
  - extension – R40.232 (header)
  - extensor posturing to pain or noxious stimuli (2-5 years of age) – R40.232 (header)
  - flexion/decorticate posturing (< 2 years of age) – R40.233 (header)
  - flexion withdrawal – R40.234 (header)
  - localizes pain (2-5 years of age) – R40.235 (header)
  - normal or spontaneous movement (< 2 years of age) – R40.236 (header)
  - obeys commands (2-5 years of age) – R40.236 (header)
  - score of
    - 1 – R40.231 (header)
    - 2 – R40.232 (header)
    - 3 – R40.233 (header)
    - 4 – R40.234 (header)
    - 5 – R40.235 (header)
    - 6 – R40.236 (header)
  - withdraws from pain or noxious stimuli (0-5 years of age) – R40.234 (header)
  - withdraws to touch (< 2 years of age) – R40.235 (header)
- opening of eyes (never) – R40.211 (header)
  - in response to
    - pain – R40.212 (header)
    - sound – R40.213 (header)
  - score of
    - 1 – R40.211 (header)
    - 2 – R40.212 (header)
    - 3 – R40.213 (header)
    - 4 – R40.214 (header)
  - spontaneous – R40.214 (header)
- verbal response (none) – R40.221 (header)
  - confused conversation – R40.224 (header)
  - cooing or babbling or crying appropriately (< 2 years of age) – R40.225 (header)
  - inappropriate crying or screaming (< 2 years of age) – R40.223 (header)
  - inappropriate words – R40.223 (header)
  - inappropriate words (2-5 years of age) – R40.224 (header)
  - incomprehensible sounds (2-5 years of age) – R40.222 (header)
  - incomprehensible words – R40.222 (header)
  - irritable cries (< 2 years of age) – R40.224 (header)
  - moans/grunts to pain; restless (<2 years old) – R40.222 (header)
  - oriented – R40.225 (header)
  - score of
    - 1 – R40.221 (header)
    - 2 – R40.222 (header)
    - 3 – R40.223 (header)
    - 4 – R40.224 (header)
    - 5 – R40.225 (header)
  - screaming (2-5 years of age) – R40.223 (header)
  - uses appropriate words (2- 5 years of age) – R40.225 (header)
eclamptic – see Eclampsia
epileptic – see Epilepsy
Glasgow, scale score – see Glasgow coma scale
hepatic – see Failure, hepatic, by type, with coma
hyperglycemic (diabetic) – see Diabetes, by type, with hyperosmolarity, with coma
hyperosmolar (diabetic) – see Diabetes, by type, with hyperosmolarity, with coma
hypoglycemic (diabetic) – see Diabetes, by type, with hypoglycemia, with coma
- nondiabetic – E15
in diabetes – see Diabetes, coma
insulin-induced – see Coma, hypoglycemic
ketoacidotic (diabetic) – see Diabetes, by type, with ketoacidosis, with coma
myxedematous – E03.5
newborn – P91.5
nontraumatic, due to underlying condition – R40.2A
persistent vegetative state – R40.3
secondary – R40.2A
specified NEC, without documented Glasgow coma scale score, or with partial Glasgow coma scale score reported – R40.244 (header)

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.