Colonoscopy (diagnostic) in Seattle, WA costs $1,423 to $2,647. Here's every hospital's price.
6 hospitals in the Seattle-Tacoma-Bellevue, WA metro area publish a cash price for colonoscopy (diagnostic) (CPT 45378). We read their files every month so you don't have to.
Across the Seattle-Tacoma-Bellevue, WA metro area, 6 hospitals list a cash price for colonoscopy (diagnostic) (CPT 45378). The lowest is $1,423 at Overlake Hospital Medical Center & Clinics, the median is $1,899 and the highest is $2,647 at Valley Medical Center.
The Seattle, WA median of $1,899 is 27% above the national median of $1,500 across 304 US hospitals with a cash price for this code.
13 of these hospitals also publish the rates they negotiated with insurers, from $4 to $10,403. With insurance you pay a share of the negotiated rate, which is sometimes higher than the cash price; you may ask for the cash price instead.
The files behind these prices are dated between January 2026 and April 2026. 14 other hospitals in the metro area have no readable price for this code: some publish no file, some block automated reading, some leave the code out. They are listed below so you can call them.
Sorted by cash price
Hospital facility fee onlyBellevue · 19 mi · File Apr 2026
Arlington · 50 mi · File Mar 2026
Seattle · 24 mi · File Jan 2026
Seattle · 24 mi · File Apr 2026
Issaquah · 9 mi · File Apr 2026
Renton · 18 mi · File Mar 2026
Everett · 39 mi · File Apr 2026
Federal Way · 27 mi · File Feb 2026
What's in the price
The hospital facility fee for CPT 45378. The doctor, anesthesia and lab work usually bill separately.
Cash vs. insured
Cash is what you pay without insurance. With insurance you pay a share of the negotiated rate, which can be higher than cash. You may ask for the cash price.
What to say on the phone
"I'd like the self-pay price for CPT 45378, in writing, and whether it covers facility, physician and anesthesia."
About colonoscopy (diagnostic)
A colonoscopy is an examination of the large intestine with a flexible camera passed through the rectum. The diagnostic version, CPT 45378, is the base procedure: the doctor looks, and if nothing needs to be removed or sampled, this is the code the hospital bills. Most people are sedated and go home the same day.
What the price covers
The hospital's price for 45378 is the facility fee: the endoscopy suite, nursing, the scope and its cleaning, recovery time and disposable supplies. It usually does not include the gastroenterologist's professional fee, the anesthesia provider, or pathology if a sample is taken. Those are billed separately, often by different companies, and can add several hundred dollars to what you see here.
If polyps are found and removed, the code changes to 45385 (polyp removal) or 45380 (biopsy), and the price changes with it. A hospital's cash price for 45378 is the best starting point, not a guarantee of the final bill.
Screening versus diagnostic
A screening colonoscopy for someone with no symptoms is preventive care, which most insurance plans cover without cost-sharing. A diagnostic colonoscopy, done because of symptoms or a positive stool test, is not. The same procedure, the same room, a different code and a different bill. If you are insured, ask before the appointment which one will be billed.
Why prices vary so much
The spread between hospitals is often five to ten times for this code. Academic medical centers and large systems tend to list higher gross charges and higher negotiated rates; community hospitals and hospital-owned outpatient centers tend to be cheaper. Location matters less than ownership and system size. Freestanding ambulatory surgery centers, which are not in these files, are often cheaper still.
Questions to ask before you book
- Is this the self-pay price for CPT 45378, in writing?
- Does it include the physician, anesthesia and pathology, or are those separate?
- If a polyp is removed, what does the price become?
- Is there a prompt-pay or financial-assistance discount on top of the cash price?
Hospitals in Seattle, WA without a price for this procedure
Listed so you know who to call. The reason is what we found on their website.
- Evergreenhealth Medical CenterWebsite blocks automated reading
- Evergreenhealth MonroeWebsite blocks automated reading
- Harborview Medical CenterWebsite blocks automated reading
- Kaiser Permanente Central HospitalFile found, not read yet
- Mary Bridge Children's HospitalWebsite blocks automated reading
- Multicare Auburn Medical CenterWebsite blocks automated reading
- Multicare Covington Medical CenterWebsite blocks automated reading
- Multicare Good Samaritan HospitalWebsite blocks automated reading
- Seattle Children's HospitalFile in an unsupported format
- Snoqualmie Valley HospitalNo website on record
- Swedish Edmonds HospitalFile found, not read yet
- Swedish Medical CenterFile found, not read yet
- Tacoma General Allenmore HospitalWebsite blocks automated reading
- University of Washington Medical CtrWebsite blocks automated reading