Headache, unspecified

This code signifies a patient presenting with head pain where the specific type, cause, or location of the headache is not documented or cannot be determined. It represents a general symptom of cephalalgia without further diagnostic specificity.

This code is appropriate when the medical record clearly indicates a headache but lacks details regarding its etiology (e.g., tension, migraine, cluster) or specific characteristics. It can be used for initial encounters when a definitive diagnosis is pending, or when documentation explicitly states "headache, unspecified."

• Avoid using this code if more specific documentation is available; always query for clarification if possible.
• Do not use this code for headaches clearly identified as secondary to another condition (e.g., post-traumatic headache, headache due to sinusitis).
• Consider sequencing this code as a principal diagnosis only if no definitive underlying cause is identified and treated during the encounter.