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    v1.0.28
    OpenPayerBilling CodesSymptoms and signs involving cognition, perception, emotional state and behaviorICD-10-CM r40-somnolence-stupor-and-coma
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    ICD-10-CM Code For Somnolence Stupor And Coma: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group R40 includes diagnoses describing altered levels of consciousness such as somnolence, stupor, and coma and conditions that impair arousal and responsiveness. These ICD-10-CM diagnosis codes are used to document clinical presentations related to impaired consciousness, capturing severity and neurologic involvement relevant to this group. Accurate coding within the ICD-10-CM R40 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM R40: Somnolence, Stupor And Coma Overview

    The ICD-10-CM R40 group includes conditions characterized by decreased levels of consciousness ranging from excessive sleepiness to coma, affecting the central nervous system. These diagnoses target neurologic status and consciousness level assessment and are commonly used in emergency, inpatient, and neurology care settings. Accurate coding of these conditions is important for clinical documentation and supports correct reimbursement by reflecting patient severity and resource needs.

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    When to Use

    Use a code from this group when a patient presents with abnormal levels of consciousness documented by clinicians, including excessive sleepiness, obvious stupor, or coma. Codes in this group should be selected to reflect the documented level of consciousness and any specified causes when applicable.

    ICD-10-CM Codes

    101 rows

    ICD-10-CM CodeDescription
    R40.0Somnolence
    R40.1Stupor
    R40.20Unspecified coma
    R40.2110Coma scale, eyes open, never, unspecified time
    R40.2111Coma scale, eyes open, never, in the field [EMT or ambulance]
    R40.2112Coma scale, eyes open, never, at arrival to emergency department
    R40.2113Coma scale, eyes open, never, at hospital admission
    R40.2114Coma scale, eyes open, never, 24 hours or more after hospital admission
    R40.2120Coma scale, eyes open, to pain, unspecified time
    R40.2121Coma scale, eyes open, to pain, in the field [EMT or ambulance]
    R40.2122Coma scale, eyes open, to pain, at arrival to emergency department
    R40.2123Coma scale, eyes open, to pain, at hospital admission
    R40.2124Coma scale, eyes open, to pain, 24 hours or more after hospital admission
    R40.2130Coma scale, eyes open, to sound, unspecified time
    R40.2131Coma scale, eyes open, to sound, in the field [EMT or ambulance]
    R40.2132Coma scale, eyes open, to sound, at arrival to emergency department
    R40.2133Coma scale, eyes open, to sound, at hospital admission
    R40.2134Coma scale, eyes open, to sound, 24 hours or more after hospital admission
    R40.2140Coma scale, eyes open, spontaneous, unspecified time
    R40.2141Coma scale, eyes open, spontaneous, in the field [EMT or ambulance]

    Showing 1–20 of 101

    DRG Codes

    6 rows

    DRG CodeDescription
    080Nontraumatic Stupor and Coma with MCC
    081Nontraumatic Stupor and Coma without MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems
    884Organic Disturbances and Intellectual Disability
    951Other Factors Influencing Health Status

    Typical Clinical Scenarios

    • An adult presents to the emergency department after a motor vehicle collision with reduced responsiveness and intermittent eye opening but no purposeful movements; airway and vital signs are stabilized, and the exam documents a depressed level of consciousness requiring frequent reassessment. A code from this group is assigned to capture the altered level of consciousness observed on presentation pending further neurologic workup. Typical codes: R40.2A, R40.20
    • An elderly nursing home resident with advanced dementia is noted by staff to have increasing periods of drowsiness and prolonged response times over weeks, with decreased oral intake but no new focal neurologic deficits; the primary team evaluates for metabolic or medication causes and documents persistent somnolence as a clinical problem contributing to care planning. A code from this group is used to indicate the chronic excessive sleepiness/reduced alertness affecting function and management. Typical codes: R40.0, R40.1
    • A patient in the intensive care unit following cardiac arrest is comatose with absent purposeful response to stimulation and requires ongoing neurologic prognostication; coma is documented as a complication of the arrest and is relevant for prognosis and coding of the current hospitalization. Typical codes: R40.2A, R40.3

    Related Codes

    R41-OTHER-SYMPTOMS-AND-SIGNS-COGNITIVE

    ICD-10-CM Code For Other Symptoms And Signs Involving Cognitive Functions And Awareness: Group Overview

    R42-DIZZINESS-AND-GIDDINESS

    ICD-10-CM Code For Dizziness And Giddiness: Group Overview

    R43-DISTURBANCES-OF-SMELL-AND-TASTE

    ICD-10-CM Code For Disturbances Of Smell And Taste: Group Overview

    R44-OTHER-SYMPTOMS-AND-SIGNS

    ICD-10-CM Code For Other Symptoms And Signs Involving General Sensations And Perceptions: Group Overview

    R45-SYMPTOMS-AND-SIGNS-EMOTIONAL-STATE

    ICD-10-CM Code For Symptoms And Signs Involving Emotional State: Group Overview

    R46-SYMPTOMS-AND-SIGNS-APPEARANCE-BEHAVIOR

    ICD-10-CM Code For Symptoms And Signs Involving Appearance And Behavior: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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