R40.4

R40.4: Transient alteration of awareness

Billable / specific codeICD-10-CM

R40.4 is a billable, specific ICD-10-CM code for transient alteration of awareness. It is valid for submission on a claim.

Check R40.4 with the rest of the claim: free scrubber

Excludes1 inherited from the categories above R40.4

A category’s note binds every code beneath it.

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 R40.4

Their own Excludes1 notes name this code, so the conflict is not listed above.

R41.82Altered mental status, unspecified

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

R40.4 is named in 21 Medicare coverage policies: 21 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A56505Billing and Coding: Transesophageal Echocardiography (TEE)
A56612Billing and Coding: CT of the Head
A56619Billing and Coding: Nerve Conduction Studies and Electromyography
A56625Billing and Coding: Echocardiography

Alphabetic index entries that lead here

Alteration, Altered›awareness›transient

Code history

Unchanged in every release from FY2024 to FY2027.