Is R40.2122 a billable ICD-10-CM code?

Yes. R40.2122 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does R40.2122 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).

R40.2122

R40.2122 — Coma scale, eyes open, to pain, at arrival to emergency department

Billable / specific codeICD-10-CM

R40.2122 is a billable, specific ICD-10-CM code for coma scale, eyes open, to pain, at arrival to emergency department. It is valid for submission on a claim.

7th character "2" — at arrival to emergency department

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

0: unspecified time
1: in the field [EMT or ambulance]
2: at arrival to emergency department
3: at hospital admission
4: 24 hours or more after hospital admission

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Coma scale eye opening score of 2

Risk adjustment

R40.2122 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 202 Coma, Brain Compression/Anoxic Damage0.543 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

R40.2122 is named in 20 Medicare coverage policies — 20 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A54799Billing and Coding: Urine Drug Testing
A55001Billing and Coding: Urine Drug Testing
A56612Billing and Coding: CT of the Head
A56645Billing and Coding: Controlled Substance Monitoring and Drugs of Abuse Testing

Code history

R40.2122 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share R40.212. If R40.2122 is not quite right, the correct code is usually one of these.

Questions about R40.2122

Is R40.2122 a billable ICD-10-CM code?: Yes. R40.2122 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does R40.2122 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).