ICD-10 Code G44.31 – Acute post-traumatic headache (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G44.31 – Acute post-traumatic headache
What it is
G44.31 identifies a headache that begins soon after a head injury or other trauma. Use it when the record clearly links the headache to the recent injury.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you will see a new headache after trauma, with timing supporting an acute post-traumatic pattern.
When to use this code
Use this code when the provider documents an acute headache caused by recent trauma, such as after a concussion or other head injury. Code it only when the relationship between the trauma and headache is stated or clearly supported. Check documentation if the onset timing is unclear.
Do not use for
Do not use it for headaches without a documented traumatic cause, or for chronic post-traumatic headache. If the headache is unrelated to the injury, check documentation for a more appropriate code.
Coding tip
Confirm both the traumatic event and the acute headache in the note before assigning G44.31.