Nontraumatic subacute subdural hemorrhage

This code signifies bleeding that has accumulated in the subdural space, beneath the dura mater but outside the brain, which is not caused by an external injury and has developed over a period of days to weeks. It indicates a subacute presentation of a subdural hemorrhage, differentiating it from acute or chronic forms. The hemorrhage is spontaneous, often due to fragile vessels or underlying medical conditions.

Use this code when documentation clearly states a subacute subdural hemorrhage without a history of trauma. This typically applies to patients presenting with neurological symptoms that have evolved over several days, and imaging (CT or MRI) confirms the presence of blood in the subdural space with characteristics consistent with a subacute phase. Documentation should explicitly rule out a traumatic etiology.

• Differentiate carefully between acute, subacute, and chronic subdural hemorrhages based on documentation of symptom onset and imaging findings.
• Ensure the documentation explicitly states "nontraumatic" or provides no indication of trauma; otherwise, a traumatic subdural hemorrhage code would be more appropriate.
• Do not confuse with epidural or subarachnoid hemorrhages, which involve different anatomical spaces and have distinct codes.