Practice operations·
What Medical School Didn't Teach You About OHIP and Medicare Billing
Most Ontario physicians graduate with almost no billing education. Here's what the Schedule of Benefits actually requires — and how to stop leaving 20–40% of your revenue behind.
Medical school trains you to diagnose, treat, and care for patients. It does not train you to navigate a billing system with over 7,000 fee codes, a complex web of premium entitlements, and adjudication rules that can mean the difference between capturing your full clinical income or quietly losing 20 to 40 percent of it every month. This gap between medical education and the practical reality of OHIP billing is not a minor inconvenience — it is a systemic problem that costs Ontario physicians millions of dollars per year in uncaptured revenue, and it starts on the first day they open their practice.
This article is for new specialists, recent graduates entering clinical practice in Ontario, and the clinic managers who support them. It covers the key concepts that medical school almost certainly did not teach you — and that you need to understand from day one.
The Scale of the Problem: 7,000+ Fee Codes and Why Most Physicians Underbill
The OHIP Schedule of Benefits is one of the most complex billing documents in Canadian healthcare. It contains thousands of fee codes across dozens of specialties, each with its own definitions, eligibility criteria, and technical requirements. Many codes have prerequisites — specific diagnoses, patient demographics, or clinical conditions that must be met and documented before the code applies. Others are time-limited or have companion codes that must be submitted together.
The result is that most new graduates default to a handful of familiar codes — typically the basic assessment and minor assessment codes they learned during residency — and apply them broadly regardless of whether a higher, more accurate code applies. Studies and billing audits consistently find that new Ontario physicians underbill by 20 to 40 percent relative to their eligible entitlement. This is not fraud or gaming the system — it is simply not knowing what you are entitled to claim.
Premium Codes: The Revenue You Are Almost Certainly Missing
Premium codes are additional fees layered on top of base service codes. They reflect circumstances that make a service more resource-intensive — and they are among the most consistently missed billing opportunities for new physicians. Premium categories include:
After-hours premiums: Services rendered on weekdays between 5:00 p.m. and 8:00 a.m., and on weekends or statutory holidays, attract time-of-day premiums. These must be claimed separately in addition to the base service fee.
Complexity and patient condition premiums: Certain patient populations — including elderly patients with multiple comorbidities — qualify for premium billing when specific documentation criteria are met.
Urgent visit premiums: When a patient is seen urgently, outside a scheduled appointment, and the visit meets the defined criteria, a premium applies.
Consult premiums: Formal consultations — which have strict definitional requirements under OHIP, including a referring physician and a written report — are billed differently from assessments, and the distinction matters significantly to your bottom line.
Many new specialists bill general assessments when a formal consultation code was appropriate and worth considerably more. The Ontario Medical Association publishes guidance on these distinctions, and investing time in understanding them early in your career pays compounding dividends.
The Annual Premium (K Codes): A Systematic Revenue Stream Most New Physicians Don't Know About
The annual premium — referred to in the Schedule of Benefits under the K-series codes — is one of the most underutilized billing mechanisms for eligible Ontario physicians. These codes allow physicians to bill a premium for patients they have a continuing care relationship with, providing an annual recurring revenue stream on top of individual service fees.
Eligibility and code selection depend on your specialty, the nature of your patient relationships, and the clinical circumstances. What matters is that you know these codes exist, understand whether they apply to your practice, and build the documentation habits that support them from the outset. Discovering K codes two years into practice — after leaving hundreds of eligible billings unclaimed — is an avoidable loss. For a detailed breakdown of annual premiums, see our article on increasing OHIP revenue with annual premium tracking.
Shadow Billing for Out-of-Province Patients
When you see a patient who is not an Ontario resident — a visitor from another province, an interprovincial transfer, or a patient temporarily in Ontario — they may still be covered by their home province's health plan. Ontario has bilateral reciprocal billing agreements with most other provinces under the Reciprocal Billing arrangements coordinated by the Canadian Medical Association.
The mechanism for this is called shadow billing: you submit the claim to OHIP using the patient's out-of-province health card information, and OHIP processes it on your behalf, seeking reimbursement from the home province. The critical mistake new physicians make is simply not billing at all for out-of-province patients, assuming the process is too complicated or that they won't be paid. In most cases, you will be paid — often at Ontario rates — and the administrative burden is minimal when handled correctly by your billing team.
Documentation: The Foundation That Makes Everything Else Work
In OHIP billing, documentation is not an afterthought — it is the evidentiary foundation for every claim you submit. A service without adequate documentation is, from OHIP's perspective, a service that did not occur. This matters not only during routine claims adjudication but especially during a post-payment review or audit.
For premium codes, consultations, and complex assessments, the documentation requirements are specific. A formal consultation, for example, requires a documented referral, clinical notes that justify the consultation, and a written report back to the referring physician. Missing any of these elements can result in the claim being reduced to a lower-tier assessment code — with a corresponding reduction in payment — even if the clinical encounter fully warranted the premium code.
Building the right documentation habits from day one is far easier than correcting them later under audit pressure. If you are unsure whether your current EMR templates capture what is needed for your most common billing codes, a free OHIP billing audit from Physicians First can identify the gaps before they become costly.
Why Physicians First Exists for New Specialists
The billing knowledge gap is not a reflection of physician competence — it is a structural failure of medical education. Physicians are trained to provide excellent care, not to become billing specialists. But in a fee-for-service environment, billing accuracy is inseparable from financial sustainability, and most new graduates enter practice without the support they need.
Physicians First was built specifically to close this gap. Our Claims Concierge service manages OHIP billing end to end for Ontario specialists — from code selection and claim submission to remittance reconciliation and rejected claim resolution. New specialists who work with us from the beginning of their practice capture their full entitlement immediately, rather than spending years gradually discovering what they were owed all along.
If you are a new specialist setting up practice in Ontario, or a clinic manager onboarding a recent graduate, we strongly recommend reviewing our guide to OHIP billing for new graduates as a starting point. And if you want to know exactly where your current billing stands, start with a free audit — it takes minutes to request and the findings are often eye-opening.
Frequently Asked Questions
How do I know which fee code applies to a given patient encounter?
The Schedule of Benefits is the primary reference, but it is dense and often requires interpretation. The OMA publishes specialty-specific billing guides that translate the Schedule into practical guidance. Your billing agent or company should also be able to advise on code selection based on your documented clinical encounter — this is a core part of what a professional billing service provides.
What is the difference between an assessment and a consultation in OHIP billing terms?
A consultation under OHIP has three required elements: a request from another physician (the referring physician), a clinical assessment, and a written report communicated back to the referring physician. If any of these elements is missing, the encounter does not qualify as a consultation and must be billed as an assessment. This distinction is significant because consultation codes are generally reimbursed at a higher rate than assessments.
I trained at a hospital and mostly saw referred patients — does that mean all my encounters were consultations?
Not necessarily. The key is whether the three consultation criteria were met for each specific encounter. Subsequent visits with the same patient following an initial consultation are typically billed as assessments, not consultations, unless a new referral has been made. Your billing history from residency may reflect hospital billing conventions that differ from fee-for-service OHIP practice.
How long does it take to see the impact of better billing practices on my income?
OHIP pays claims on a predictable monthly cycle — most electronic claims submitted within the first few weeks of the month are paid within 30 days. Correcting billing practices and capturing missed premium codes or consultation codes has an almost immediate financial impact, often visible within the first full billing cycle after changes are implemented.
What is the risk of being audited if I start billing more aggressively for codes I was previously missing?
There is no audit risk in billing accurately. OHIP audits are triggered by outlier patterns — billing significantly above specialty peers in ways that suggest upcoding or fabrication, not by physicians who correctly capture entitlements they were previously missing. Billing for a formal consultation when you performed one, or claiming an after-hours premium when you saw a patient outside business hours, is simply accurate billing. The risk lies in claiming codes your documentation does not support — not in claiming everything you are legitimately owed.