R40.2121 ICD-10-CM Code: Coma scale, eyes open, to pain, in the field [EMT or ambulance]
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
R40.2121Coma scale, eyes open, to pain, in the field [EMT or ambulance]
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where R40.2121 sits
- 1
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
- 2
Section
Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)
- 3
Category R40
Somnolence, stupor and coma
- 4
Subcategory R40.212
Coma scale, eyes open, to pain
- 5
Code R40.2121
Coma scale, eyes open, to pain, in the field [EMT or ambulance]
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for R40.2121.
Code first
No “code first” instruction is listed for R40.2121.
Use additional code
No “use additional code” instruction is listed for R40.2121.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for R40.2121.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for R40.2121.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code R40.2121 mean?
R40.2121 is the FY 2027 U.S. ICD-10-CM code for “Coma scale, eyes open, to pain, in the field [EMT or ambulance].”
Is R40.2121 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, R40.2121 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is R40.2121 located in ICD-10-CM?
R40.2121 is listed in Chapter 18, Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), within Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46) (R40–R46), under category R40, Somnolence, stupor and coma and subcategory R40.212, Coma scale, eyes open, to pain.
What coding notes are listed for R40.2121?
No inclusion terms are listed for R40.2121 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
Keep exploring
Related R40.212 codes
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