R40.20

Billable

Unspecified coma

HCC Category Mapping

V28HCC 202 — Coma, Brain Compression/Anoxic Damage

0.000

V24HCC 80 — Coma, Brain Compression/Anoxic Damage

0.546

ESRDHCC 80 — Coma, Brain Compression/Anoxic Damage

0.000

What This Code Means

A state of complete unconsciousness where the patient cannot be awakened and the cause is not specified.

Coding Tips

•This code should only be used when the coma is unspecified; if the cause is known, use a more specific coma code
•Always attempt to determine if the coma is traumatic or nontraumatic, as this affects code selection

Clinical Significance

Unspecified coma represents a state of profound unconsciousness where the patient cannot be aroused and shows no purposeful responses. This condition carries significant mortality risk and requires intensive monitoring, supportive care, and investigation into the underlying cause while representing substantial resource utilization.

Documentation Requirements

✓Documentation of unresponsive state
✓Glasgow Coma Scale score if assessed
✓Duration of coma
✓Level of consciousness assessment
✓Neurological examination findings
✓Investigations performed to determine cause
✓Response to stimuli documented
✓Associated complications or supportive measures

Commonly Confused Codes

R40.2A — Nontraumatic coma due to underlying condition is more specific R40.3 — Persistent vegetative state has different consciousness level F44.2 — Stupor in dissociative disorders is psychiatric, not medical coma G93.1 — Anoxic brain damage may be underlying cause