Unsp intcrn injury w LOC >24 hr w/o ret consc w surv, subs

This code signifies an unspecified head injury resulting in a prolonged coma or persistent vegetative state exceeding 24 hours, where the patient has not regained their baseline level of consciousness but is still alive. It indicates an ongoing care episode for a patient with severe, sustained neurological impairment due to head trauma.

Apply this code for follow-up encounters when a patient continues to exhibit a severely altered mental status (e.g., coma, vegetative state) more than 24 hours post-unspecified intracranial injury, and has not returned to their pre-injury cognitive function. Documentation should clearly state the duration of unconsciousness, the lack of return to baseline, and the patient's survival.

• Ensure documentation specifies "subsequent encounter" to justify the 7th character 'D'.
• Distinguish from codes indicating return to consciousness or death; this code is for ongoing survival with persistent severe neurological deficit.
• Always sequence this code after any specific intracranial injury codes, if known, or as the primary diagnosis if the injury remains unspecified.