OHIP error report·A34
OHIP error code A34: multiple duplicate claims
OHIP rejected the claim because it matches another claim already on file as a duplicate for that patient, provider, service, and date.
Most often affects Hospitalists, Internal medicine, Orthopaedic surgery, Anaesthesia, and other specialist practices.
The one-line answer
OHIP rejected the claim because it matches another claim already on file as a duplicate for that patient, provider, service, and date.
Ministry wording: Multiple duplicate claims.
Why it fires
- The same encounter was submitted twice, often after a timeout, a second batch, or two users billing the same visit.
- A corrected claim was sent as a new claim instead of an adjustment of the original, so the Ministry sees two identical services.
- Two sites or two software tools billed the same patient, date, and fee schedule code (clinic plus hospitalist workflow, or EMR plus a billing vendor file).
The Ministry label is multiple duplicate claims. The edit is comparing this item to claims already received. It is not accusing you of seeing the patient twice. It is saying the second (or third) claim looks like the same payable service.
Specialist groups produce A34 when a rejected consult is “fixed” by cloning a new claim while the original is still in flight or already paid. Another pattern is the surgeon and the hospitalist both submitting a visit for the same inpatient date with the same listing. A third is weekend coverage: the MRP and the on-call physician both bill the same assessment.
A34 is different from A14 (records show the service was rendered by another practitioner, group, or IHF). A34 is duplication against claims the system already treats as yours or as the same item. If another physician was paid, you may see A14 instead. Read the code you actually received.
What it costs
The duplicate line is rejected. If an original claim already paid, you do not collect a second fee. If nothing has paid yet, one of the copies still needs to be the single valid submission.
The cost of A34 is usually wasted labour plus delay, not a second lost consult, when the first claim already paid. The dangerous case is when both copies reject and nobody notices that nothing paid. Then the encounter is fully unpaid until one clean claim is accepted.
There is no extra “duplicate penalty” amount published as a dollar figure. You simply cannot be paid twice for the same listed service.
How to fix it going forward
- Search the billing file for the patient and service date before creating a “replacement” claim.
- When a claim is on the error report, correct that claim. Do not open a second new claim for the same listing.
- Agree who bills inpatient assessment days when more than one specialist sees the patient.
- Turn off dual submission from EMR and a second vendor for the same encounters.
A34 is a workflow collision. The technical fix is one system of record for claim state: submitted, error, paid. The clinical fix is a coverage rule for who bills the day’s assessment.
After a vendor cutover, run a duplicate report for two cycles. Cutover weekends are a classic A34 burst.
Is it recoverable?
Recoverable by resubmission inside the window
If nothing has paid, submit one corrected claim and abandon the duplicate. If the original already paid, do not resubmit the same listing. Stay inside the three-month window for any still-unpaid original.
Read the remittance advice and the error report together. Identify which item paid, which rejected, and which is still in process. Only the unpaid, non-duplicate line should move forward.
If both copies died and the window has closed, the service may be recoverable by written application as a single unpaid encounter, not as two fees.
For in-province services on or after 1 April 2023, claims must be submitted within three months of the date of service, not six. Ontario INFOBulletin 230402 is the Ministry notice. Many third-party pages still quote six months. That window is closed for current work. If the original claim reached the Claims Error Report inside three months, a corrected resubmission can still be filed after the window in the Ministry's stale-date process. If the claim was never submitted in time, payment may be recoverable by written application. That is not a routine resubmit.
Related codes
Frequently asked questions
- What does OHIP error code A34 mean?
- A34 means multiple duplicate claims. OHIP treated this item as a duplicate of a claim already on file for that patient, provider, service, and date.
- If A34 rejects, did the first claim pay?
- Not always. Check the remittance advice. Sometimes the original paid and the copy rejected. Sometimes both are in error. Only one payable claim should proceed.
- How is A34 different from A14?
- A14 means records show the service was rendered by another practitioner, group, or IHF. A34 is a duplicate against claims already submitted as the same item.
For how error reports relate to the remittance advice, see how to read your OHIP remittance advice and what rejection codes actually mean. Official wording for this code: Ministry of Health, Error Report Rejection Conditions (December 2022).