Diagnostic code
780 — Signs and Symptoms Not Yet Diagnosed: Convulsions, ataxia, vertigo, headache, except tension headache and migraine
780 is an OHIP diagnostic code used on Ontario Health Insurance Plan claims. Signs and Symptoms Not Yet Diagnosed: Convulsions, ataxia, vertigo, headache, except tension headache and migraine.
- Code
- 780
- Description
- Signs and Symptoms Not Yet Diagnosed: Convulsions, ataxia, vertigo, headache, except tension headache and migraine
Updated October 26, 2026
780 is the OHIP diagnostic code for general symptoms not yet diagnosed, such as convulsions, unsteadiness, vertigo and headache.
Conditions billed under this code
- Seizure
- Dizziness
What it covers
The Ministry's list describes 780 as 'Signs and Symptoms Not Yet Diagnosed: Convulsions, ataxia, vertigo, headache, except tension headache and migraine'. It sits at the end of the Nervous System and Sense Organs chapter, and appears again under Symptoms, Signs and Ill-Defined Conditions as 'Ataxia'.
Use it while the cause is still being worked out: a first seizure or febrile convulsion, dizziness or vertigo, unsteadiness, or a headache that isn't migraine or tension type. In ICD-9, the system the list is based on, 780 is also where general symptoms such as fever, fatigue and weakness are filed.
Once there is a diagnosis, use its code: 345 epilepsy, 346 migraine and other headache types, 386 Meniere's disease or labyrinthitis, 795 myalgic encephalomyelitis/chronic fatigue syndrome, 297 delirium. Symptoms of one body system have their own codes: 785 heart and circulation (chest pain, fainting), 786 breathing, 787 digestive, 788 urinary, 781 muscles and joints.
Related codes: 781, 785, 786, 787, 788, 799, 345, 346
Sources
APEX flags claims whose diagnostic code does not fit the service billed before they come back rejected. See how APEX works · Pricing