Skip to content 
Key Takeaways
- A screening colonoscopy that turns diagnostic changes into codes, modifiers, and what the patient owes. Your billing partner must catch it on every claim.
- Credex Healthcare is our top pick for GI practices that want one team to handle billing, coding, and credentialing.
- The strongest GI billing companies bill the endoscopy center claim and the physician claim together, so the two never disagree.
- Prior authorization for procedures and IBD biologics is where many GI denials start.
- Before you sign with any vendor, ask for GI-specific denial and days-in-AR reports.
Gastroenterology billing companies earn their fee in the minute after a polyp shows up on the monitor. They scheduled a screening colonoscopy and thought they would not have to pay anything. The doctor removes the polyp, and the case is billed differently, with new modifiers, new payer rules, and 15% coinsurance for Medicare patients in 2026. If something goes wrong, you have to either accept the decline or send a patient a bill they didn’t expect. Because of that one moment, billing for gastroenterology needs coders who know endoscopy and not generalists who use a cheat sheet.
Credex Healthcare offers gastroenterology billing services. It does this for GI groups, endoscopy centers, and hepatology offices. We look at seven GI billing companies who offers medical billing services and compare them on endoscopy codes, ASC billing, prior permission, and reporting so that you can make a short list of companies that work best for your business.
Why Gastroenterology Medical Billing Is So Complex
The rules for medical bills in gastroenterology are different depending on the reason for the treatment, who pays for it, and where it was done.
It is the difference between screening and diagnostic colonoscopy that causes the most trouble. Medicare claims for screening use G-codes like G0121 or G0105, and claims for diagnostic and therapeutic work use the 45378 series. Commercial insurers look for modifier 33 when a polyp is removed during a screening, while Medicare looks for the PT modifier, with Z12.11 or the right personal history code found first. People who don’t get either one will be charged for care that should have been free.
When several procedures from the same family are done in the same session, multiple endoscopy payment rules apply. This means that the base procedure is paid for only once instead of being stacked. There are special screening codes for anesthesia used in GI endoscopy. Place also matters. When you bill an ASC or endoscopy center, you must submit matching facility and professional fee claims. Outpatient cases at a hospital also have their own set of rules. There are a lot of things that need to be approved ahead of time for pathology, capsule endoscopy, IBD biologics, and infusion billing.
What Makes a Gastroenterology Billing Company Great?
It is possible for most medical billing companies to make a clean office visit claim. Not many people can handle gastroenterology medical billing on a day when they have back-to-back colonoscopies. These five things should you look for:
- Certified GI coders. Ask for qualified GI coders who have worked with the 45378 series, EGD, ERCP, and NCCI changes before. General skills in coding aren’t enough.
- A process for screening-to-diagnostic conversions. The team should have a written process for modifiers 33 and PT, and a way to communicate cost-sharing.
- ASC and professional billing together. When one team bills for both claims, it finds mistakes in the dates and codes before the buyers do.
- Prior authorization for procedures and biologics. IBD drugs like infliximab and vedolizumab need to be approved and re-approved at set times.
- Transparent pricing and reporting. Ask out what the secret costs of choosing a billing company are, and make sure you get monthly reports on the number of denials and the number of days in accounts receivable.
These are the seven companies we think fit GI practices best this year.
The 7 Best Gastroenterology Billing Companies in 2026
| Company | Best for |
| Credex Healthcare | Billing, coding, and credentialing with one team |
| AMBSI Inc. | Procedure-heavy groups with an endoscopy center |
| Transcure | ASC groups wanting facility and professional billing in one platform |
| P3 Healthcare Solutions | Multi-provider groups needing pre-submission coding review |
| Integra Global Solutions | Onshore account management with offshore billing |
| Diskriter | Hospital-affiliated GI groups |
| BillingParadise | Clearing an aged AR backlog |
Credex Healthcare (Top Choice)
Credex Healthcare works with gastroenterologists, GI groups that run an endoscopy center, and hepatology practices that want one team for billing, coding, and credentialing. Its coders handle screening-to-diagnostic conversions, multiple endoscopy rules, and biologic authorizations before claims go out, and the company reports a 99 clean claim rate. New gastroenterologists have to be credentialed with payers and granted privileges at endoscopy centers before they can bill a single case, a process covered in our list of the best credentialing companies for gastroenterology.
Services: GI coding and billing, ASC and endoscopy center claims, prior authorization, denial management, AR recovery, gastroenterology credentialing, monthly revenue reporting
Why Credex Healthcare: One team handles the physician claims, the facility claims, and provider enrollment, so nothing gets lost between vendors.
AMBSI Inc.
AMBSI Inc. supports the entire revenue cycle, from verifying patient eligibility and coding care to submitting claims, posting payments, and collecting debt. It works well for GI groups that do a lot of procedures, have their own endoscopy center, and need to keep track of a lot of cases every day. AMBSI also helps review customer contracts and create superbills, which matters when your income depends on a few high-volume codes.
Services: Medical billing and coding, eligibility verification, denial management, AR follow-up, credentialing, contract review
Why AMBSI: Billing support and contract support in one engagement
Transcure
Transcure is a big RCM company that has a billing program just for gastroenterology. Its writers know how to use GI CPT, ICD-10, and HCPCS codes for reports about colonoscopies and endoscopies. This works well for GI groups that run an ASC and need a single platform for both facility and professional billing. The company increased AI-assisted claim review for GI offices in 2026 so that code mistakes could be found before the claims were sent in.
Services: GI billing and coding, eligibility verification, charge capture, claim scrubbing, payment posting, denial follow-up
Why Transcure: Scale plus a GI-specific program, which helps groups with several locations
P3 Healthcare Solutions
Physician groups and hospitals can hire P3 Healthcare Solutions to help them with billing, rejection management, accounts receivable recovery, and billing checks. Its review of codes before submission works well for GI groups with more than one provider whose doctors document procedures in different ways. P3 is also in charge of MIPS reporting, which helps groups keep track of quality measures like the rate of adenoma detection.
Services: Medical billing, coding review, denial management, AR recovery, billing audits, credentialing, MIPS reporting
Why P3 Healthcare Solutions: A second check on charges before they reach the payer
Integra Global Solutions
Integra Global Solutions has account management in the US and a marketing and coding team in another country. Practices that want a named onshore contact and want to keep costs low on routine work like charge entry, payment posting, and AR follow-up can use that setup. GI doctors should make sure that the workers who are assigned to their account have experience with endoscopy when they first start working with them.
Services: Medical billing, coding, AR management, eligibility verification, payment posting
Why Integra Global Solutions: US-based communication at offshore pricing
Diskriter
Diskriter started out doing medical typing and coding. Now, they help physician groups and hospitals with coding, billing, and paperwork. GI doctor groups that work with hospitals need people with that background to code procedure notes correctly before they can bill. When the same company handles billing and coding, it’s easier to resolve issues when a note doesn’t match the code.
Services: Medical coding, billing, documentation support, coding audits
Why Diskriter: A tight link between documentation and coding
BillingParadise
BillingParadise helps physician practices and health systems with billing, coding, and managing their accounts receivable. GI practices that need to work on old denials before the deadline for filing them runs out should use its AR recovery work. These practices often have a backlog of claims denied after a staff change or system switch. The business also sells AI tools for managing denials.
Services: Medical billing, coding, AR management, denial management, analytics
Why BillingParadise: Focused help clearing aged AR
Why GI Practices Outsource Billing
Most groups outsource gastroenterology billing because the front desk can’t handle all the procedures. Full revenue cycle management means that a partner handles all of the billing, collections, rejections, and coding. This frees up your staff to make appointments and prepare calls. The choice is usually based on three pressures:
Procedure volume. On a busy endoscopy day, there may be dozens of claims, each with its own modifiers and pathology charges.
Facility and professional claims. When a group has an endoscopy center, they charge twice as much for every case. If you run an ASC, you should also look at different billing businesses.
Payer screening rules. Medicare, private insurance, and Medicaid all have different rules for screening colonoscopies. These rules often cause medical bills to be denied.
Outsourcing doesn’t suit every practice. A small hepatology clinic with a stable group of payers might be able to get by with just one experienced biller on staff. GI groups with more than one location normally can’t. If you’re deciding whether to outsource or keep billing in-house, our guide will help you weigh staff cost, control, and coverage.
Pricing is the next question. Billing companies usually charge a flat monthly fee, a percentage of what they collect, or a fee per claim. The best option for ASC and endoscopy center billing will depend on how many claims you make and whether ASC claims are included. Before you ask for quotes, read about percentage-based vs. flat-fee billing prices.
Conclusion: Choosing from the Best Gastroenterology Billing Companies
When you go from screening to diagnosis, the right partner will correctly code each case, send bills to your endoscopy center and doctors, and give you monthly rejection and AR numbers. Credex Healthcare is the most complete of these gastroenterology billing companies because they handle coding, billing, and licensing all with one team.
Outsource your GI billing to Credex Healthcare.
Book a free consultation with Credex Healthcare today if you're ready to hand over your GI billing to us. We'll look over your current claims.
FAQs
How much do gastroenterology billing companies charge?
Most gastroenterology billing companies charge a percentage of collections, a flat monthly fee, or a per-claim fee. Your price will depend on the number of procedures, the types of payers, and whether endoscopy center claims are included. Before you sign, look at different billing and pricing models.
What happens when a screening colonoscopy becomes diagnostic?
Once a polyp is removed, the colonoscopy is considered beneficial. For business claims, add modifier 33. For Medicare claims, add the PT modifier. In 2026, Medicare patients still don’t have to pay the deductible, but they do have to pay 15% of their care costs. That goes down to 10% in 2027 and then to nothing in 2030.
Can one company bill both the endoscopy center and the physician claims?
Yes, and it works better most of the time. Process codes, diagnosis codes, and dates of service must match between the facility claim and the professional claim. When there is only one team billing, mistakes are caught before buyers deny them. Check out Credex Healthcare’s ASC billing services.
Should we audit our billing before switching companies?
Yes. A medical billing audit finds mistakes in coding from screening to diagnosis, missed modifiers, underpaid claims, and open accounts receivable before the handover. It starts the new business off on a good note and gives you a standard against which to judge its progress.
