Is R40.2 a billable ICD-10-CM code?

No. R40.2 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does R40.2 sit in the tabular list?

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46).

What cannot be coded together with R40.2?

R40.2 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above R40.2 (R40) and apply to it just the same.

R40.2

R40.2 — Coma

Non-billable headerICD-10-CM

R40.2 is a non-billable header ICD-10-CM code for coma. It cannot be billed on its own: choose one of the more specific child codes below.

Code first

The underlying condition must be sequenced before this code.

any associated:
fracture of skull (S02.-)
intracranial injury (S06.-)

Notes

Additional guidance from the ICD-10-CM tabular list.

One code from each subcategory, R40.21-R40.23, is required to complete the coma scale

Excludes1 inherited from the categories above R40.2

These are not written on R40.2, but they bind it: a note on a category applies to every code beneath it. Billing R40.2 with anything listed here is a denial.

Written on R40 — Somnolence, stupor and coma

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)

Other codes that can never be billed with R40.2

These codes carry an Excludes1 note pointing at R40.2. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading R40.2 alone.

R41.82Altered mental status, unspecified
R40.2ANontraumatic coma due to underlying condition
R55Syncope and collapse
R40.0Somnolence
R40.1Stupor

Risk adjustment

R40.2 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

R40.2 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead R40.2

6 child codes. Green means billable.

Related codes at this level

Codes that share R40. If R40.2 is not quite right, the correct code is usually one of these.

Questions about R40.2

Is R40.2 a billable ICD-10-CM code?: No. R40.2 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does R40.2 sit in the tabular list?: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46).
What cannot be coded together with R40.2?: R40.2 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above R40.2 (R40) and apply to it just the same.