ICD-10 Diagnosis Code R40.2420

Glasgow coma scale score 9-12, unspecified time

Diagnosis Code R40.2420

ICD-10: R40.2420
Short Description: Glasgow coma scale score 9-12, unspecified time
Long Description: Glasgow coma scale score 9-12, unspecified time
This is the 2018 version of the ICD-10-CM diagnosis code R40.2420

Valid for Submission
The code R40.2420 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99)
    • Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)
      • Somnolence, stupor and coma (R40)

Information for Medical Professionals

According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.

Code Edits
The following edits are applicable to this code:
Unacceptable principal diagnosis Additional informationCallout TooltipUnacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual’s health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Glasgow coma scale, 10
  • Glasgow coma scale, 11
  • Glasgow coma scale, 12
  • Glasgow coma scale, 9

Replacement Code Additional informationCallout TooltipReplacement Code
The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2017. This is a new and revised code for the FY 2018 (October 1, 2017-September 30, 2018).

This code replaces the following previously assigned ICD-10 code(s) listed below:
  • R40.242 - Glasgow coma scale score 9-12

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