When a health provider delivers a service, they get reimbursed through a multi-step process that starts with documenting what they did and ends with a payer (an insurance company or government program) sending payment. The specific path depends on the payment model: some providers are paid per service, others receive a flat rate per patient, and an increasing number are paid based on quality outcomes. Here’s how each model works and what happens behind the scenes to turn a patient visit into a check.
The Fee-for-Service Model
Fee-for-service is the most traditional reimbursement method. The provider performs a service, submits a claim describing what was done, and the payer reviews and pays for each individual item. A routine office visit, a blood draw, and an X-ray would each generate a separate charge.
The process follows a predictable sequence. First, the provider’s office translates the visit into standardized codes: a diagnosis code that explains why the patient needed care, and a procedure code that describes what the provider actually did. Diagnosis codes drive decisions like whether a service is covered and, for hospital stays, which payment category the case falls into. Procedure codes identify the specific work performed, whether that’s a 15-minute office visit or a surgical procedure. If these codes don’t match up logically (say, a knee surgery billed with a diagnosis of sore throat), the claim will be flagged or denied.
Before the claim reaches the insurance company, it typically passes through a clearinghouse, a digital middleman that checks for missing fields, formatting errors, and coverage gaps. Catching mistakes here means fewer rejections later and faster payment. Once the claim arrives at the payer, it goes through adjudication: the payer verifies the patient’s eligibility, checks for duplicate claims, confirms the service is covered under the plan, and calculates how much to pay. If everything checks out, the payer approves the claim and sends payment. If something is missing or questionable, the claim gets suspended until the provider supplies additional information.
How Payment Amounts Are Calculated
For Medicare, the math behind each payment starts with relative value units, or RVUs. Every medical service is assigned three RVU components: one reflecting the provider’s work (time, skill, effort), one covering practice expenses (rent, equipment, staff), and one accounting for malpractice insurance costs. These three numbers are added together and multiplied by a fixed dollar conversion factor to produce the final payment rate. For 2025, that conversion factor is $32.35, down about 3% from $33.29 in 2024.
Private insurers use Medicare’s framework as a reference point but consistently pay more. On average, private insurance reimburses physicians at 143% of Medicare rates. The gap is even wider for hospitals: private insurers pay roughly double Medicare rates for hospital services overall, averaging 199% of Medicare. Outpatient hospital services see the largest spread, with private payers averaging 264% of Medicare rates. This is why many providers care deeply about their payer mix, the proportion of patients covered by private insurance versus government programs.
Capitation: A Fixed Amount Per Patient
Under capitation, a provider or health organization receives a set amount of money per patient for a defined period, regardless of how many services that patient uses. Think of it as a subscription: the payer sends a predictable monthly payment to cover a specific population’s expected care needs. If patients stay healthy and need fewer services, the provider keeps the difference. If patients require more care than anticipated, the provider absorbs those costs.
This model shifts financial risk from the payer to the provider. It rewards efficiency and preventive care rather than volume. A capitated primary care practice has a financial incentive to keep patients out of the emergency room through better chronic disease management, because every avoided hospitalization is money saved.
Value-Based Reimbursement
The federal government has been moving Medicare toward value-based payment through a framework that ties a portion of reimbursement to quality performance. Providers participating in this system are evaluated on measures like patient outcomes, cost efficiency, and use of electronic health records. Their scores translate into payment adjustments: higher-quality providers earn bonuses, while lower performers see reductions.
Providers who go further can join what are called Advanced Alternative Payment Models. These require taking on financial risk (meaning the provider could owe money back if costs exceed targets) in exchange for higher potential rewards. Providers who meet participation thresholds in these models receive a higher conversion factor applied to their Medicare payments and are exempt from the standard quality reporting requirements. The idea is to create a stronger incentive for providers to coordinate care, reduce waste, and focus on results rather than simply billing for more services.
Prior Authorization and Payment Delays
For many services, reimbursement doesn’t begin until the provider gets advance approval from the payer through prior authorization. Private insurers attach prior authorization requirements to roughly 5,000 procedure, diagnostic, drug, and site-of-care codes. Before providing a covered service, the provider must submit clinical documentation justifying why the service is needed and wait for the payer’s decision.
This step adds significant time to the reimbursement process. About 27% of providers report that prior authorization decisions take longer than five days. Roughly 70% of prior authorization requests submitted by providers are ultimately approved, but 18% of those require an appeal before the approval comes through. The back-and-forth between providers and payers during this process is a major source of administrative burden. Follow-up communication, where each side waits on the other for information or decisions, is the single step most commonly cited as contributing to burnout for both provider and payer staff. Electronic prior authorization systems can shorten decision times, but adoption remains uneven.
What Happens After a Claim Is Denied
A denied claim doesn’t necessarily mean the provider won’t get paid. Denials happen for a range of reasons: incorrect coding, missing documentation, lapsed patient coverage, or a determination that the service wasn’t medically necessary. Providers can correct errors and resubmit, or file a formal appeal with supporting clinical evidence.
The appeals process varies by payer but generally involves multiple levels of review. Each level requires additional documentation and time. For providers running on thin margins, denied and delayed claims create cash flow problems, which is why most medical offices invest heavily in coding accuracy and eligibility verification before services are even rendered. Getting it right the first time is the fastest path to reimbursement.
Why the Same Service Costs Different Amounts
The price a provider receives for the same service can vary dramatically depending on who’s paying. A private insurer might reimburse a hospital outpatient procedure at more than two and a half times the Medicare rate. Even among private insurers, rates differ because each one negotiates separate contracts with providers. Larger health systems with more bargaining power tend to command higher reimbursement rates, while smaller independent practices have less leverage.
Patient cost-sharing (copays, deductibles, coinsurance) also factors in. The payer calculates the total allowed amount for a service, pays its share, and the remaining balance becomes the patient’s responsibility. If the patient doesn’t pay their portion, the provider either absorbs the loss or sends it to collections. For providers, reimbursement is never just one payment from one source. It’s the sum of what the insurer pays plus what the patient owes, minus whatever gets written off along the way.