R40.2131 — Coma scale, eyes open, to sound, in the field [EMT or ambulance]
Is R40.2131 billable?
Yes — R40.2131 is billable for FY2027. R40.2131 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. R40.2131 may be submitted for encounters from October 1, 2026 through September 30, 2027.
R40.2131 at a glance
| Code | R40.2131 |
|---|---|
| Description | Coma scale, eyes open, to sound, in the field [EMT or ambulance] |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "1" | in the field [EMT or ambulance] |
What does the 7th character "1" mean in R40.2131?
In R40.2131, the 7th character 1 means in the field [EMT or ambulance]. The 7th character is required for R40.2131 to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
What Medicare edits apply to R40.2131?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name R40.2131 directly.
CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.
Which MS-DRGs does R40.2131 group to?
R40.2131 sits in MDC 23 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 951Other Factors Influencing Health Statusmedical
How is R40.2131 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under R40.213, the nearest indexed parent of R40.2131. Use them to find the family, then select the specific code.
- Coma › with › opening of eyes › in response to › sound
- Coma › with › opening of eyes › score of › 3
Inclusion terms
Alternative wording in documentation that is classified to R40.2131.
- Coma scale eye opening score of 3
Excludes1 — never code together — inherited from R40
The conditions below can never be reported together with R40.2131 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Code first — inherited from R40.2
The underlying condition below must be sequenced before R40.2131. R40.2131 describes a manifestation and cannot be the principal or first-listed diagnosis.
Excludes2 — not included here — inherited from Chapter 18
The conditions below are not part of R40.2131, but a patient may have both at the same time. When documentation supports it, R40.2131 and the excluded code may both be reported.
Excludes2 — not included here — inherited from R40-R46
The conditions below are not part of R40.2131, but a patient may have both at the same time. When documentation supports it, R40.2131 and the excluded code may both be reported.
- symptoms and signs constituting part of a pattern of mental disorder (F01-F99)
How long has R40.2131 existed?
R40.2131 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.