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M400B
M400B – Surgical assistant service
OHIP General Preamble Code — GENERAL PREAMBLE · Schedule of Benefits
M400B is a billing code used for surgical assistant services when the Schedule of Benefits does not list a specific basic unit value under the 'Asst' column for a procedure, but does list one under the 'Anae' column. In this case, the number of basic units for the assistant's service is taken from the 'Anae' column.
This service is only eligible for payment upon authorization by a medical consultant, which requires the submission of a letter from the surgeon explaining why an assistant was necessary. The total fee is calculated by adding these basic units to the applicable time units and multiplying the sum by the standard assistant unit fee.
Pre-authorization required
Authorization by a medical consultant is required.
A letter from the surgeon outlining the reason the assistant was required must be submitted with the claim.
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