ICD-10-CM 2027 diagnosis code
R40.2431Glasgow coma scale score 3-8, in the field [EMT or ambulance]
R40.2431 is a valid, billable ICD-10-CM code for glasgow coma scale score 3-8, in the field [emt or ambulance]. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Glasgow coma scale score 3-8, in the field
Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About R40.2431
R40.2431 is the ICD-10-CM diagnosis code for Glasgow coma scale score 3-8, in the field [EMT or ambulance]. It belongs to category R40 (Somnolence, stupor and coma), block R40-R46 (symptoms and signs involving cognition, perception, emotional state and behavior) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "1" means in the field [EMT or ambulance].
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
It was added in FY2017, effective October 1, 2016.
7th character
1in the field [EMT or ambulance]
Other encounter types for R40.243:
Notes that apply from higher levels
Instructions written at a parent level also apply to R40.2431.
› From R40.24 Glasgow coma scale, total score
- Assign a code from subcategory R40.24, when only the total coma score is documented
› From R40.2 Coma
Broader instructions also apply from R40-R46 Symptoms and signs involving cognition, perception, emotional state and behavior and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2017 (effective 10/1/2016): Added
- No changes since FY2017.
Common questions about R40.2431
Is R40.2431 billable?
- Yes. R40.2431 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "1" at the end of R40.2431 mean?
- It is the 7th character for in the field [EMT or ambulance].
Can R40.2431 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is R40.2431 a CC or MCC?
- No. R40.2431 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does R40.2431 group to?
- R40.2431 is used in the MS-DRG v44.0 logic for MS-DRG 951 (Other Factors Influencing Health Status). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.