A colonoscopy is the gold-standard screening test for colorectal cancer, the second-leading cause of cancer death in the United States. The U.S. Preventive Services Task Force recommends screening colonoscopy every 10 years starting at age 45 for average-risk adults. About 15 million colonoscopies are performed in the U.S. each year, and the cash prices vary by more than $3,000 depending on where the procedure happens and how it is billed. Uninsured adults should check whether they qualify for Medicaid, which covers preventive colonoscopy with minimal or no cost-sharing.
The single biggest cost driver is not what happens during the procedure, it is the label on the bill. A screening colonoscopy for an asymptomatic 50-year-old is covered at 100% by ACA plans and Medicare, the patient pays nothing. The same procedure on the same patient, billed as diagnostic because they reported abdominal pain, can leave the patient with a $1,500 bill. This is the surprise billing trap that catches patients every year.
This guide covers what a colonoscopy costs without insurance in 2026, what Medicare pays, the screening vs diagnostic vs surveillance pricing distinction, and the billing errors most likely to inflate your bill. The ACA mandate for preventive colonoscopies is documented at HHS HealthCare.gov preventive care and the Medicare coverage rules are explained in full detail below.
Colonoscopy Cost by Site of Service in 2026
The biggest cost driver of Colonoscopy is the site of service: where the procedure is performed. 2026 CMS price transparency data confirms a 2-3x billing differential between independent centers and hospital outpatient departments.
Colonoscopy prices without insurance vs. 2026 Medicare rates| Site of Service | Range Without Insurance | 2026 Medicare Rate |
|---|
| Ambulatory surgery center (ASC) | $1,250 – $2,800 | $680 |
| Hospital outpatient department | $2,500 – $4,800 | $1,260 |
| GI office-based endoscopy suite | $1,500 – $3,000 | $720 |
| Inpatient hospital (during admission) | $3,800 – $7,500 | Bundled in DRG |
2026 Medicare rates reflect ASC payment APC 5313 and Hospital OPPS payment for code group 5313. Without-insurance ranges reflect CMS Hospital Price Transparency data and FAIR Health Consumer. Physician professional fee (~$400) is billed separately on top of facility rates.
Source: CMS Physician Fee Schedule 2026, Hospital Outpatient PPS 2026, ASC Payment System 2026, FAIR Health Consumer
Why the Same Procedure Is So Much More at a Hospital
Hospital outpatient departments bill colonoscopies at facility rates that include overhead, equipment, and a wider staffing model. Ambulatory surgery centers (ASCs) operate with much lower overhead and compete on price. The procedure itself is identical, the same scope, the same sedation, often the same gastroenterologist. Only the facility code on the claim differs. Most low-risk screening colonoscopies are performed at ASCs for exactly this reason.
The difference shows up in what Medicare pays. The 2026 ASC facility rate (APC 5313) is approximately $680, while the Hospital Outpatient PPS rate for the same procedure is approximately $1,260, almost double. The physician professional fee under the Medicare Physician Fee Schedule is approximately $400 on top of either facility rate. In cash-pay markets the hospital-vs-ASC spread is often 2 to 3 times.
The practical takeaway: if your gastroenterologist has admitting privileges at both a hospital and an ASC, schedule the colonoscopy at the ASC. You will likely save $1,500 to $2,500 without giving up safety or quality. Ask explicitly: is this facility an ASC or a hospital outpatient department?
Colonoscopy Cost by Type: Screening vs Diagnostic vs Surveillance
The procedure looks the same on the exam table, but the billing code, and your out-of-pocket cost, depend on why your doctor ordered it. Screening is preventive care for an asymptomatic patient. Diagnostic is investigation of a specific symptom or abnormal stool test. Surveillance is follow-up after prior polyps or cancer. ACA plans cover screening at 100%, but diagnostic and surveillance trigger deductibles and coinsurance.
Typical cost by variant| Type | When it applies | Patient cost (ACA plan) | Medicare cost |
|---|
| Screening (average risk) | Age 45+, asymptomatic, no prior polyps | $0 | $0 (no deductible, no coinsurance) |
| Screening (high risk) | Family history, IBD, prior cancer | $0 | $0 (no deductible, no coinsurance) |
| Diagnostic | Symptoms present (bleeding, pain, anemia) | Deductible + coinsurance apply | 20% coinsurance after $283 deductible |
| Surveillance (after polyps) | Follow-up colonoscopy 3-5 years after polypectomy | Deductible + coinsurance apply | 20% coinsurance (deductible waived under 2022 rule update) |
| Screening converts to therapeutic | Polyp found and removed during screening | $0 on ACA plans (covered as preventive) | 15% coinsurance only (no deductible) under Medicare 2022 rule |
Under a 2022 Medicare rule change, when a screening colonoscopy converts to therapeutic (polyp removed), the patient pays only a reduced coinsurance (15% in 2023-2026), not the Part B deductible. This coinsurance phases down to 10% in 2027-2029 and 0% in 2030. On ACA-compliant private plans, polyp removal during a screening colonoscopy remains fully covered as preventive care.
Source: CMS 2026 Physician Fee Schedule, ACA preventive services guidance, HHS / CMS rule on screening-to-diagnostic conversion
What Medicare Pays for Colonoscopy
Medicare covers screening colonoscopies (HCPCS G0105 for high-risk patients, G0121 for average-risk patients) at 100% with no Part B deductible and no coinsurance. There is no age cap, screening continues for as long as a physician recommends it. The 2026 Medicare Physician Fee Schedule pays approximately $400 for the professional component, plus $680 in an ASC or $1,260 in a hospital outpatient department for the facility component.
If a polyp is found and removed during a screening colonoscopy, Medicare reclassifies it as therapeutic. Under a 2022 rule change, the beneficiary pays a reduced coinsurance of 15% (for 2023-2026), not the 2026 Part B deductible of $283. This coinsurance phases down further: 10% in 2027-2029, then 0% starting in 2030. Diagnostic and surveillance colonoscopies (ordered because of symptoms or prior polyp history that triggers earlier follow-up) carry the full 20% coinsurance plus the Part B deductible.
What Factors Affect Cost
- Screening vs diagnostic vs surveillance billing classification, the single biggest patient-cost factor.
- Site of service (ASC vs hospital outpatient department), hospital costs almost 2x more under Medicare.
- Anesthesia type and provider billing model (monitored anesthesia care by an anesthesiologist adds $400 to $1,200).
- Polyp removal and pathology fees (each polyp specimen sent to pathology can add $100 to $400).
- Bowel prep medication (typically $20 to $150 out-of-pocket, depending on prep type).
- Geographic region (urban Northeast and California markets tend to be highest, rural Midwest lowest).
- Insurance network status of the facility, the gastroenterologist, and the anesthesiologist (all three can bill separately).
Common Colonoscopy Billing Errors
Colonoscopy is one of the most error-prone bills in U.S. healthcare because the screening-to-diagnostic distinction is so cost-sensitive. Check for these errors before paying:
- Screening colonoscopy billed as diagnostic because intake paperwork mentioned a symptom. If you scheduled it as routine screening, push back, modifier 33 or PT should apply.
- Polyp removal during a screening colonoscopy billed with full deductible and coinsurance instead of the reduced cost-sharing required by the 2022 Medicare rule update.
- Anesthesiologist billed out-of-network when the facility is in-network (No Surprises Act may apply, do not pay before checking).
- Multiple separate facility charges for the same procedure (one bill from the ASC plus a duplicate hospital outpatient claim).
- Hospital outpatient rate billed for a procedure performed at an affiliated ASC.
- Bowel prep medication billed at retail when a generic alternative was available.
- Each polyp specimen billed as a separate full pathology workup instead of a single multi-specimen review.
Frequently Asked Questions
How much does a colonoscopy cost without insurance in 2026?
Without insurance, a colonoscopy typically costs between $1,250 and $4,800. The national median is around $2,750. Ambulatory surgery centers charge $1,250 to $2,800, while hospital outpatient departments charge $2,500 to $4,800 for the exact same procedure. Add a physician professional fee of roughly $400 and a pathology fee of $100 to $400 per polyp removed.
Is a screening colonoscopy free under insurance in 2026?
Yes, on ACA-compliant private plans and Medicare. The Affordable Care Act requires plans to cover USPSTF-recommended preventive services, including screening colonoscopy for adults 45 and older, at 100% with no deductible, no copay, and no coinsurance. Medicare covers screening colonoscopies (HCPCS G0105 and G0121) at 100% with no Part B deductible and no coinsurance. The catch: it has to be billed as screening, not diagnostic.
What is the difference between a screening and a diagnostic colonoscopy?
A screening colonoscopy is preventive care for an asymptomatic adult, age 45 or older, with no symptoms and no prior history that would trigger surveillance. A diagnostic colonoscopy is ordered to investigate a specific symptom such as rectal bleeding, abdominal pain, anemia, or an abnormal stool test. Same procedure, but the billing label changes everything: screening is covered at 100%, diagnostic triggers your deductible and coinsurance.
What if a polyp is found during my screening colonoscopy?
On ACA-compliant private plans, polyp removal during a screening colonoscopy is still fully covered as preventive care, you pay $0. On Medicare, the procedure is reclassified as therapeutic, but under a 2022 rule the patient pays only a reduced coinsurance (15% in 2023-2026), not the Part B deductible. That coinsurance drops to 10% in 2027-2029 and to 0% starting in 2030. Watch the bill, this is one of the most common screening-to-diagnostic billing errors.
How much does Medicare pay for a colonoscopy in 2026?
In 2026, Medicare pays approximately $400 for the gastroenterologist (Physician Fee Schedule) plus a facility fee. The facility fee is about $680 at an ambulatory surgery center or $1,260 at a hospital outpatient department under the Hospital OPPS. For screening colonoscopies (G0105 or G0121), you pay $0. For diagnostic and surveillance colonoscopies you pay the 20% coinsurance after meeting the 2026 Part B deductible of $283.
Can I get a colonoscopy without insurance?
Yes. Many ambulatory surgery centers offer cash-pay bundled prices of $1,250 to $2,000 that include the gastroenterologist, facility, anesthesia, and basic pathology. Always ask for the bundled cash price up front and get it in writing. Hospital outpatient self-pay quotes are usually 2 to 3 times higher. Some federally qualified health centers and state-run colorectal cancer programs offer free or sliding-scale colonoscopies for uninsured adults age 45 and older.
Why did I get a bill for my screening colonoscopy?
The most common reason: it was reclassified as diagnostic. If a polyp was found, if intake notes mentioned a symptom, or if you had a prior polyp that put you on a surveillance schedule, the billing code changes. On ACA plans, polyp removal during screening should still be covered at 100%, so a bill in that case is a billing error. Request an itemized bill, check the modifiers (33 or PT for screening), and dispute it with the provider and your insurer.
How often should I get a colonoscopy?
The USPSTF recommends screening colonoscopy every 10 years for average-risk adults age 45 to 75. High-risk patients (family history of colorectal cancer, inflammatory bowel disease, prior adenomas) are typically screened more often, every 3 to 5 years. After age 75, screening decisions are individualized based on health status. Screening is 100% covered by ACA plans and Medicare at the recommended interval.
