Error code
ADF — Required related procedure missing, invalid or paid at zero
Required procedure missing
The procedure this code must be billed with is missing, invalid or paid at $0.
What to do: Make sure the required procedure is on the claim and payable, fixing its own error first, then resubmit both.
- Code
- ADF
- Description
- Required related procedure missing, invalid or paid at zero
Explanation
Updated October 26, 2026
The procedure this code depends on is missing, invalid or paid at $0. Fix the related procedure and resubmit.
What it means
ADF means the corresponding procedure is invalid, omitted or paid at zero. The billed code is only payable with another procedure, and OHIP didn't find a valid, paid one.
On the Remittance Advice, the matching explanatory code is DF: the corresponding fee code was not billed or was paid at zero.
Common causes
- The required procedure wasn't billed
- The required procedure was rejected or paid $0
- A different procedure was billed from the one the code must go with
How to fix it
- Check the Schedule of Benefits for the procedure this code must be billed with.
- Make sure that procedure is on the claim and payable.
- If it was rejected, correct its error first, then resubmit both together.
- Resubmit the corrected claim. Resubmit within three months of the service date if you can. If that window has passed but the claim was first submitted on time, use the Ministry's stale-dated resubmission process described under VJ7.
Don't resubmit if
- The required procedure wasn't provided.
How APEX handles it
APEX reads your error reports and remittance advice from MCEDT and lists claims rejected with this code in its Correction Centre for you to correct and resubmit. See how APEX works · Pricing