2017/18 ICD-10-CM Diagnosis Code R40.2421

Glasgow coma scale score 9-12, in the field [EMT or ambulance]

The following code(s) above R40.2421 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to R40.2421:
  • R00-R99
    2018 ICD-10-CM Range R00-R99

    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

    Note
    • This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
    • Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
    • The conditions and signs or symptoms included in categories R00-R94 consist of:
    • (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
    • (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
    • (c) provisional diagnosis in a patient who failed to return for further investigation or care;
    • (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
    • (e) cases in which a more precise diagnosis was not available for any other reason;
    • (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
    Type 2 Excludes
    • abnormal findings on antenatal screening of mother (O28.-)
    • certain conditions originating in the perinatal period (P04-P96)
    • signs and symptoms classified in the body system chapters
    • signs and symptoms of breast (N63, N64.5)
    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
  • R40-R46
    2018 ICD-10-CM Range R40-R46

    Symptoms and signs involving cognition, perception, emotional state and behavior

    Type 2 Excludes
    • symptoms and signs constituting part of a pattern of mental disorder (F01-F99)
    Symptoms and signs involving cognition, perception, emotional state and behavior
  • R40
    ICD-10-CM Diagnosis Code R40

    Somnolence, stupor and coma

      2016 2017 2018 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • 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)
    Somnolence, stupor and coma
  • R40.2
    ICD-10-CM Diagnosis Code R40.2

    Coma

      2016 2017 2018 Non-Billable/Non-Specific Code
    Code First
    • any associated:
    • fracture of skull (S02.-)
    • intracranial injury (S06.-)
    Note
    • One code from each subcategory, R40.21-R40.23, is required to complete the coma scale
    Coma
  • R40.24
    ICD-10-CM Diagnosis Code R40.24

    Glasgow coma scale, total score

      2016 2017 2018 Non-Billable/Non-Specific Code
    Note
    • Assign a code from subcategory R40.24, when only the total coma score is documented
    Glasgow coma scale, total score
ICD-10-CM R40.2421 is grouped within Diagnostic Related Group(s) (MS-DRG v35.0):

Convert R40.2421 to ICD-9-CM

Code History
ICD-10-CM Codes Adjacent To R40.2421
R40.2364 …… 24 hours or more after hospital admission
R40.24 Glasgow coma scale, total score
R40.241 Glasgow coma scale score 13-15
R40.2410 …… unspecified time
R40.2411 …… in the field [EMT or ambulance]
R40.2412 …… at arrival to emergency department
R40.2413 …… at hospital admission
R40.2414 …… 24 hours or more after hospital admission
R40.242 Glasgow coma scale score 9-12
R40.2420 …… unspecified time
R40.2421 …… in the field [EMT or ambulance]
R40.2422 …… at arrival to emergency department
R40.2423 …… at hospital admission
R40.2424 …… 24 hours or more after hospital admission
R40.243 Glasgow coma scale score 3-8
R40.2430 …… unspecified time
R40.2431 …… in the field [EMT or ambulance]
R40.2432 …… at arrival to emergency department
R40.2433 …… at hospital admission
R40.2434 …… 24 hours or more after hospital admission
R40.244 Other coma, without documented Glasgow coma scale score, or with partial score reported

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.