Remittance Advice · Payment-time (remittance)
OHIP explanatory code MW
Maximum Number of Weeks has elapsed since payment of initial service
What MW means
The Ministry of Health’s official wording for MW is: “Maximum Number of Weeks has elapsed since payment of initial service.”
This code appears as an explanatory code on your monthly Remittance Advice (RA). It means the claim was adjudicated — paid, reduced, or refused — for the reason below. A claim already on your RA generally shouldn't be blindly resubmitted; follow the suggested action.
How to fix MW
The fee was reduced or capped under this rule. If you believe the full amount was payable, file a Remittance Advice Inquiry with supporting detail.
Payment-time codes appear on the monthly Remittance Advice after adjudication. Some are informational, some explain a reduced or refused payment. Where you disagree with the outcome, the usual route is a Remittance Advice Inquiry or written inquiry — not resubmitting the same claim, which can create a duplicate.
Related codes
- MRMinimum service requirements have not been met
- MSMaximum allowed for sleep studies in a specific period by one or more physicians has been reached
- MUMaximum Units Exceeded
- MXMaximum of 2 arthroscopy "R" codes with E595 has been reached
- MYYearly maximum has been exceeded
- O1Fee for obstetric care apportioned
- O2Previous prenatal care already claimed
- O3Previous prenatal care already claimed by another doctor
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Code meaning per Ontario Ministry of Health — Remittance Advice Explanatory Codes / Messages (March 2026). The suggested action is general information for Ontario physicians, not billing, legal, or tax advice — codes and rules change, so verify against the current Ministry of Health documents before relying on a claim.