How Much Does a Colonoscopy Cost? Pricing at 140+ U.S. Hospitals

National Colonoscopy Pricing by Procedure

All prices below are cash-pay ("self-pay") rates, filtered to exclude implausible outliers under $300 or over $15,000.

A third code, HCPCS G0121, is used for Medicare and some commercial screening colonoscopies on average-risk patients. It isn't present in our transparency dataset because most hospitals bundle it with 45378 plus modifier 33 in their chargemaster files — we discuss why that matters for billing in the screening loophole section below.

The Transparency Paradox

The federal Hospital Price Transparency Rule took effect in 2021 with a straightforward goal: if hospitals published their prices in machine-readable form, competitive pressure would narrow the gaps between them. Five years in, the gap hasn't narrowed. The same CPT — 45378, a diagnostic colonoscopy — costs $311 at Marion General Hospital in Columbia, Mississippi and $10,353 at Physicians Care Surgical Hospital in Royersford, Pennsylvania. That's a 33x gap for the identical procedure, published publicly by both hospitals under the same federal rule.

We call this the Transparency Paradox: the rule made the data visible, but didn't change what hospitals charge. Spreads stay wide, and a patient's out-of-pocket cost still depends almost entirely on which door they walk through and whether the procedure is coded as screening or diagnostic. Transparency was supposed to shop the hospitals on patients' behalf. In practice, it only shops for the patients who know the data exists and know how to use it.

Why Colonoscopy Cost Varies So Much

The 33-fold spread between the cheapest and most expensive hospital in our data isn't a clerical error. It reflects five structural pricing drivers:

• Diagnostic vs. screening. Screening is covered at 100% by most commercial insurance and Medicare for ages 45–75 under the Affordable Care Act. Diagnostic isn't — if you have symptoms, or a surveillance follow-up, the deductible applies from the first dollar.
• Polyp removal upgrade. Historically, a screening colonoscopy was re-coded as diagnostic the instant a polyp was removed, moving cost-sharing onto the patient mid-procedure. Federal guidance in 2022 closed that loophole for screening colonoscopies (see below), but patients who had the procedure ordered as diagnostic to begin with don't benefit.
• Facility fee. Ambulatory surgery centers (ASCs) typically charge 45–60% less than hospitals for the identical CPT. The gastroenterologist's fee is similar in either setting; it's the facility fee that moves.
• Anesthesia billing. Propofol administered by a CRNA or anesthesiologist is usually billed as a separate claim, adding $500–$2,000. Some hospitals bundle it into a "global" price; most don't.
• Geography and market concentration. Colonoscopy cash prices at urban hospital networks frequently run 5–10× what the same procedure costs at a rural community hospital. The hospitals on our cheapest-ten list below are in Columbia (MS), Dillingham (AK), Morehead (KY), and Saint Johnsbury (VT) — all rural or small-town.
• Pathology billing (when a polyp is found). If the gastroenterologist removes tissue, it goes to a pathologist for analysis — and that pathologist bills separately from the hospital, typically $200–$600 per specimen. Patients routinely get surprised by the pathology bill weeks after the procedure. When a colonoscopy is covered as screening under the ACA, the pathology read is also supposed to be covered as an integral part of the screening; when the procedure is coded as diagnostic, it isn't.
• In-network hospital, out-of-network doctor. The hospital can be in your insurance network while the gastroenterologist, anesthesiologist, or pathology group are not — each of those is a separate provider with separate contracts. Even at an in-network facility, you can receive out-of-network bills from any of the three professionals involved. Ask for each provider's name and network status before the procedure.

10 Most Expensive vs. 10 Cheapest Diagnostic Colonoscopies

All prices below are cash-pay rates for CPT 45378 (diagnostic colonoscopy, no biopsy). Each hospital appears once, taking the maximum cash price it reports.

10 Most Expensive (CPT 45378, cash)

10 Cheapest (CPT 45378, cash)

A cash-pay patient at Physicians Care Surgical Hospital in Royersford, PA pays roughly 33 times more for a diagnostic colonoscopy than a cash-pay patient at Marion General Hospital in Columbia, MS — the same CPT code, same procedure.

The Screening Loophole

Here's the billing trick that determined whether thousands of Americans paid $0 or $2,000 for the same procedure for most of the last decade.

Under the Affordable Care Act, commercial insurers and Medicare must cover preventive screening colonoscopies at 100% for average-risk adults aged 45–75 — no deductible, no copay, no coinsurance. To qualify, the procedure has to be coded as screening: commonly HCPCS G0121 for Medicare, or CPT 45378 with modifier 33 on most commercial plans. That's straightforward when the colonoscopy comes back clean.

The problem was what happened when it didn't. For years, the moment a gastroenterologist snared a polyp mid-procedure, the claim would get re-coded from screening (45378) to therapeutic (45385, polypectomy). That one-letter change flipped the entire procedure from "preventive, fully covered" to "diagnostic, deductible and coinsurance apply." Patients who went in expecting $0 got surprise bills for thousands.

That changed on January 1, 2022. The Departments of Labor, HHS, and Treasury issued joint guidance (FAQs About Affordable Care Act Implementation Part 51) clarifying that polyp removal during a screening colonoscopy must also be covered at 100%. The removal is considered an integral part of the screening, not a separate diagnostic service. Medicare applied a parallel rule.

But the loophole didn't disappear. It moved. The 2022 rule only protects procedures ordered as screening in the first place. If your doctor writes the order as diagnostic — because you reported a symptom (bleeding, change in bowel habits, abdominal pain), because a prior stool test came back positive, or because you're on a surveillance interval after previous polyps — the full deductible applies from the moment the scope goes in. Same CPT code sometimes, same procedure in the room, completely different bill.

Two questions that change everything:

1. Ask the ordering physician's office: "Is this being submitted as screening or diagnostic? What CPT code and diagnosis code are on the order?"
2. Ask your insurance before the procedure: "If I give you this CPT code and this diagnosis code, how will this claim be processed — as preventive with no cost-sharing, or against my deductible?"

Get the answer in writing or via a reference number. Billing departments and gastroenterology practices are generally willing to walk through this — they deal with the confusion every day.

How to Pay Less for a Colonoscopy

1. Confirm it's coded as screening if you're age 45–75, average-risk, and asymptomatic. Ask for G0121 (Medicare) or 45378 with modifier 33 (commercial) on the order.
2. Ask about an ambulatory surgery center. Your gastroenterologist may have privileges at both an ASC and a hospital outpatient department. Choosing the ASC routinely saves $1,500–$4,000 on the facility fee alone.
3. Request bundled pricing. Ask the billing department for a single written estimate that includes the facility fee, the physician fee, anesthesia, and pathology. Hospitals can provide this; they just usually don't volunteer it.
4. Get a written cost estimate before the procedure. Under the No Surprises Act, uninsured and self-pay patients are entitled to a good-faith estimate.
5. If uninsured, ask the cash-pay price directly. Hospital cash-pay rates are typically 30–50% below sticker and are not automatically quoted.

What to Ask When Scheduling

A short checklist to take to the phone call:

• Is this being coded as screening or diagnostic?
• What is the CPT code on the order?
• What happens to the billing if a polyp is found and removed? Will the claim still be processed as preventive?
• Is anesthesia billed separately, or is it included in the facility fee?
• Is the facility fee included in the price you're quoting me?
• Who reads the pathology, and is that a separate bill?
• Can I get a written good-faith estimate of my total out-of-pocket cost before the procedure?

Frequently Asked Questions

References & Further Reading

• U.S. Preventive Services Task Force: Colorectal Cancer Screening (2021) — official recommendation lowering the screening age from 50 to 45.
• American Cancer Society: Colorectal Cancer Screening Guideline — average-risk screening options and intervals.
• FAQs About Affordable Care Act Implementation, Part 51 — 2022 joint guidance clarifying that polyp removal during a screening colonoscopy must be covered at 100%.
• CMS Hospital Price Transparency Rule (45 CFR 180) — the federal requirement that produces the underlying data on this page.
• CMS: No Surprises Act — Good-Faith Estimates — your right to a written cost estimate before a scheduled procedure.

More Research