R40.2311

Glasgow coma scale score, best motor response, none, at arrival to emergency department

R40.2311 is a specific ICD-10-CM code used to document a clinical finding within the Glasgow Coma Scale (GCS) assessment, which is the gold standard for evaluating the depth and duration of impaired consciousness. The best motor response component is a crucial prognostic indicator in neurological emergencies, particularly traumatic brain injury (TBI). A score of 'none' (1 point) is the lowest possible assessment on the motor sub-scale, indicating that the patient exhibits no muscle movement in any extremity in response to painful stimuli (such as a sternal rub or supraorbital pressure). The 'at arrival to emergency department' seventh character indicates this baseline neurological status was captured during the initial triage or assessment phase. This finding suggests severe central nervous system depression or devastating neurological injury and usually necessitates immediate airway protection and intensive neurosurgical or neurological intervention.

Clinical Symptoms

Complete absence of motor response to painful stimuli
Flaccid muscle tone in all four extremities
Absence of purposeful withdrawal or localization
Absence of decerebrate (extensor) posturing
Absence of decorticate (flexor) posturing
Profound coma
Loss of protective airway reflexes
Areflexia in limbs

Common Causes

Severe traumatic brain injury (TBI)
Acute intracranial hemorrhage (epidural, subdural, or intracerebral)
Global cerebral anoxia or hypoxia (e.g., following cardiac arrest)
Brainstem stroke or massive ischemic infarction
End-stage transtentorial brain herniation
Severe central nervous system depressant overdose (e.g., barbiturates, opioids)
Advanced metabolic encephalopathy
Fulminant infectious meningitis or encephalitis

Documentation & Coding Tips

Explicitly document the lack of motor response to both verbal commands and painful stimuli to justify the None category.

Example: Patient arrived at the ED at 0200 hours following a high-velocity motor vehicle accident. Upon initial assessment, the patient demonstrates no motor response to deep central nail bed pressure or supraorbital pressure (R40.2311). This total lack of motor activity, in the absence of paralytics, indicates a severe neurological insult, supporting HCC 122 (Coma) and justifying the high-intensity medical decision making for a new patient encounter (CPT 99205).

Billing Focus: The documentation must specify the arrival to the emergency department to support the sixth character 1, and the Seventh character 1 for the specific motor response level.

Ensure the GCS motor score is recorded prior to the administration of neuromuscular blocking agents or heavy sedation.

Example: Initial ED evaluation at 14:15: Best motor response is none (R40.2311). This was documented prior to the administration of Rocuronium for emergency endotracheal intubation. The patient remains in a coma with a high risk of herniation. This baseline status is critical for risk-adjusted mortality modeling and supports the medical necessity of CPT 99291.

Billing Focus: Documentation should clarify that the clinical status (None) was observed before pharmacological intervention to avoid coding errors related to medication-induced states.

Report all three GCS components (Eyes, Verbal, Motor) individually to provide a complete clinical picture and enable the reporting of the total GCS score.

Example: ED Arrival Assessment: Eyes open: none (R40.2111); Verbal response: none (R40.2211); Best motor response: none (R40.2311). Total GCS score: 3 (R40.2411). The patient is presenting with acute respiratory failure and traumatic subarachnoid hemorrhage (S06.6X9A). The combination of these specific codes reflects the highest tier of neurological severity for facility and professional billing.

Billing Focus: Individual component coding is required to assign the summary GCS code, which is essential for accurate DRG assignment in inpatient settings.

Differentiate between flaccidity (None) and abnormal posturing (Decerebrate/Decorticate) as they map to different ICD-10-CM codes.

Example: Upon arrival to the ED via EMS, the patient is noted to be flaccid with no motor response to painful stimuli (R40.2311). This differs from decerebrate posturing which would require coding to R40.2321. The patient exhibits no brainstem reflexes, and the lack of motor response supports the diagnosis of suspected brain death or severe cerebral edema, impacting the risk-adjusted expected length of stay.

Billing Focus: Clinical clarity between no response (None) and extension/flexion responses is vital for correct seventh-character selection in the R40.23- series.

Note the timing of the GCS assessment specifically as arrival to the ED to satisfy the requirement for the R40.2311 code.

Example: At 18:30 on ED arrival, the best motor response is documented as none (R40.2311). This initial assessment serves as the baseline for the treatment of a massive intraparenchymal hemorrhage (I61.9). This status was re-evaluated every 15 minutes, but the arrival score is what determines the specific 2026 ICD-10-CM code for the initial encounter data.

Billing Focus: The fifth character 1 (None) and sixth character 1 (Arrival to ED) must be supported by time-stamped clinical notes from the initial triage or physician assessment.

Relevant CPT Codes

99285 - Emergency department visit for the evaluation and management of a patient, which requires a high level of medical decision making
A patient with no motor response (GCS 1) always requires high-level MDM due to the immediate threat to life or limb.
99291 - Critical care, evaluation and management of the unstable critically ill or critically injured patient; first 30-74 minutes
GCS motor: none (R40.2311) indicates a critically ill patient requiring intensive, life-saving interventions.
31500 - Intubation, endotracheal, emergency procedure
Patients with a motor response of none usually have a total GCS < 8 and require immediate airway protection via intubation.
70450 - Computed tomography, head or brain; without contrast material
The standard first-line imaging for any patient presenting with a GCS motor score of none at arrival to the ED.
99255 - Inpatient or observation consultation for a new or established patient, which requires a high level of medical decision making
Neurologists or Neurosurgeons are often called for high-complexity consultations for patients presenting in a coma.
61107 - Drill hole(s) for puncture of ventricles, with or without injection of contrast material, for implanting ventricular catheter, pressure recording device, or drainage of fluid
Patients with GCS motor score of none and TBI often require invasive ICP monitoring as per trauma guidelines.
99205 - Office or other outpatient visit for the evaluation and management of a new patient, which requires a high level of medical decision making or 60-74 minutes of total time
While primarily an ED/Inpatient code, a high-level E/M is necessary for the initial neurosurgical evaluation of a patient in this state.
99215 - Office or other outpatient visit for the evaluation and management of an established patient, which requires a high level of medical decision making or 40-54 minutes of total time
Used for complex management of established neurosurgical patients who may have acute neurological decompensation.
99214 - Office or other outpatient visit for the evaluation and management of an established patient, which requires a moderate level of medical decision making or 30-39 minutes of total time
May be used in follow-up care for a patient who has partially recovered from the initial coma.
99213 - Office or other outpatient visit for the evaluation and management of an established patient, which requires a Low Complexity MDM or 20-29 Minutes of medical decision making or 20-29 minutes of total time
Used for routine follow-up of stable neurologic conditions, though unlikely during the acute phase of a coma.