Service Code Correct Format (A, B, C Suffixes)


5 character OHIP billing service code

All OHIP codes are 5 characters in length. They all end in one of the following:

  • "A" – Assessments, Consultations, or procedures
  • "B" – Surgical assist
  • "C" – Anesthesia


  1. Internal medicine assessment should be entered as A135A in the system.
  2. For Mediastinoscopy:

    • Z329A– billed by the Surgeon
    • Z329B– billed by the Surgical Assistant
    • Z329C– billed by the Anesthesiologist

OHIP Billing Codes By Specialty

We've created several medical billing quick reference sheets to help you with OHIP billing codes.


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