Most people think hospitals work like restaurants. You receive a service, you receive a bill, you pay the bill. Healthcare doesn't work that way.

One of the biggest misconceptions in healthcare finance is believing that a hospital actually expects to collect the amount it bills. It usually doesn't. To see why, follow one patient from the moment she walks into the hospital until the money lands in the bank.

Meet Sarah. She's 68, and she's lived with severe arthritis in her hip for years. After physical therapy, injections, and medications, she finally schedules a total hip replacement. The surgery goes well. She spends two nights in the hospital and heads home. From Sarah's perspective, everything is finished. For the hospital, the financial journey is just beginning.

Stop 01The Hospital Creates a Bill

After Sarah is discharged, the hospital generates its bill. The total is $85,000 — and that number includes everything: operating room, surgical staff, nursing, medications, the hip implant, imaging, lab work, the recovery room, and the stay itself.

Most people see that number and assume it's what the hospital is trying to collect. Not exactly. This is the gross charge, or chargemaster price. Think of it like the MSRP on a new truck — a starting price, not necessarily what anyone actually pays.

Stop 02The Coders Tell Sarah's Story

Now Sarah's chart goes to coding — one of the most misunderstood jobs in healthcare. Coders don't decide how sick Sarah was, and they don't invent diagnoses. They translate the physician's documentation into standardized ICD-10 diagnosis and procedure codes. Those codes tell Medicare exactly what happened.

Here's where it gets interesting. Imagine two patients:

Patient One
Sarah

A straightforward hip replacement. No major complications. She is assigned one DRG.

Medicare Pays
$21,400
Patient Two
David

Same OR, same surgeon, same implant, same procedure — but chronic kidney disease and a documented postoperative complication. A different DRG.

Medicare Pays
$33,900

Nothing about the operating room changed. The payment changed because the medical story changed. That's why revenue cycle professionals say coders don't create revenue — they make sure the patient's story is told accurately. Good documentation ensures the hospital is paid appropriately. Poor documentation leaves thousands on the table.

Stop 03Medicare Decides the Price

Here's the part that surprises almost everyone. Medicare doesn't look at the $85,000 bill and negotiate it down. It largely ignores it. Instead, Medicare asks one question: what DRG does this case belong in?

Each DRG carries a predetermined payment formula. It starts with a national base payment, then adjusts for factors like local wage index, teaching hospital status, rural location, and safety-net adjustments. Sarah's case lands at $21,400 — the allowed amount. Not because anyone negotiated. Because the formula said so. It's remarkably predictable.

Stop 04The Payment Arrives

Several weeks later, Medicare sends an electronic remittance — the 835 remittance advice, the explanation that accompanies the payment. Here's how Sarah's breaks down:

835 Remittance Advice · Sarah · Total Hip Replacement
Hospital billed$85,000
Medicare allowed$21,400
Medicare paid$19,664
Patient responsibility (Part A deductible)$1,736
Contractual adjustment$63,600
Total revenue earned$21,400

That contractual adjustment — $63,600 — confuses people. Did the hospital lose it? No. It was never entitled to collect it. By participating in Medicare, the hospital agreed to accept Medicare's payment formula. The rest simply disappears as a contractual adjustment.

Stop 05The Hospital Actually Gets Paid

Medicare deposits $19,664. Sarah pays her $1,736 inpatient deductible — the flat amount Part A charges for a hospital stay in a benefit period, with no daily coinsurance until day 61. Together, that's $21,400: the amount the hospital actually earns. Not $85,000.

Stop 06Accounting Takes Over

Finally, accounting records the transaction. Revenue is recognized, cash is deposited, and any remaining patient balance sits in Accounts Receivable until collected. Cash increases, AR decreases, and the encounter rolls into the orthopedic service line — then into the hospital's overall income statement. One patient's surgery becomes one tiny line inside a billion-dollar health system's financials.

When a headline says "hospitals charged $85,000 for a hip replacement," that number is often the least important number in the story.

Why This Matters

Gross charges make headlines. Allowed amounts determine revenue. The numbers that actually matter are the ones underneath the sticker price:

But employers play a different game. Everything so far is Medicare. Employer-sponsored health plans often work very differently. Some commercial insurers pay hospitals a percentage of Medicare; others use negotiated case rates, per diems, bundled payments, or even a percentage of billed charges.

That means two employers can send employees to the same hospital for the exact same hip replacement — and receive dramatically different bills. Not because the surgery changed. Not because the implant changed. Not because the patient was sicker. Because the contract changed. For employers, that's where strategy begins.

Billing isn't revenue

The biggest lesson isn't that hospitals bill high amounts. Sarah's hospital billed $85,000 and earned $21,400. The remaining $63,600 wasn't lost — it simply never existed as collectible revenue. Understanding that distinction is the first step toward understanding healthcare finance. And once you understand it, you start asking much better questions: not just about hospital pricing, but about insurance contracts, employer health plans, and why costs vary so dramatically from one payer to the next.

Coming next: why two employers can pay completely different prices for Sarah's exact same hip replacement — even when it's performed by the same surgeon, in the same operating room, on the same day.

— Tess