A gastroenterology payment solution is not one piece of software. It is a way of fixing the three places GI revenue leaks: denied claims, claims paid below contract, and patient balances that never get collected. Liver clinics face the same leaks with their own codes, covered in our guide to hepatology billing.
The fixes are different for each. Denials are fixed at the source, by correcting screening conversions, authorizations, bundling, diagnoses and documentation. Underpayments are fixed by checking every payment against the contract and appealing the shortfall. Patient balances are fixed with estimates before the procedure, collection at check-in and payment plans.
Most practices focus on denials and miss the other two. The sections below walk through each fix, then a 90-day audit to find which leak costs your practice the most.
Three Places GI Payments Leak
Denials are the visible leak. The claim comes back unpaid with a reason code, and someone has to fix and resubmit it.
Underpayments are quieter. The claim is paid, but for less than the contract allows, and no one notices unless payments are checked against the fee schedule.
Patient balances grow as deductibles rise and screening colonoscopies turn diagnostic. Without clear estimates and collection at the visit, many of these balances age into write-offs.
Each leak has its own measure. Track the first-pass denial rate for denials, the gap between expected and paid amounts for underpayments, and the share of patient balances over 90 days for collections. Looking at all three together shows where revenue is really being lost.
How to Fix the Five Most Common GI Denials
A Transcure analysis of first-submission denials across 340 GI practices, reported by Becker’s ASC, found five categories behind most of them. The data is vendor-sourced and descriptive, but it matches the GI billing mistakes billing teams see every week.
Screening Turned Diagnostic (27%)
When a screening colonoscopy finds a polyp, the claim needs the right codes and modifier 33 or PT. Missing them shifts cost to the patient or denies the claim. Our guide to screening vs diagnostic colonoscopy billing covers the rules.
Missing Prior Authorization (22%)
EGDs, capsule endoscopy and some biologics often need approval. Starting authorization at scheduling, not the day before, prevents most of these. Our post on automating GI prior authorizations explains how.
Same-Day Bundling Conflicts (19%)
NCCI edits bundle some endoscopy codes billed on the same day. Our post on same-day EGD and colonoscopy billing shows which pairs pay and which deny.
Unspecified Diagnosis Codes (16%)
Vague ICD-10 codes fail to support medical necessity. Our guide to gastroenterology ICD-10 codes lists the specific codes to pair with each procedure.
Documentation Gaps (11%)
Procedure notes that do not show technique, findings or necessity leave claims open to denial and audit. Polypectomy is a common example, covered in our post on 45380 vs 45385.
Recovering GI Underpayments From Payers
These gastroenterology billing errors look like paid claims, so they rarely reach a denial report. Comparing each payment to the contracted rate is the only way to find them.
| Leak | How to spot it | Fix |
|---|---|---|
| Multiple endoscopy cuts | Second code paid too low | Check payer’s reduction rule |
| Wrong fee schedule | Allowed below contract | Load current rates, appeal |
| Anesthesia units | Time or base units short | Match records to claim |
| Site of service | Office vs facility rate mix-up | Correct place of service |
| Screening cost shift | Patient billed for screening | Add modifier 33 or PT |
To recover the money, list each underpaid claim with the contracted rate, the amount paid and the difference, then send it to the payer as a reprocessing request or appeal. Batch similar claims together, since one payer error often affects many claims.
When a payer pays below contract, the contract itself is your appeal. Our guide to underpayment appeals explains how to use it.
Collecting GI Patient Balances Before They Age
GI patients often expect a screening colonoscopy to be free. When a polyp is removed, Medicare patients now owe 15% coinsurance, and commercial plans may apply deductibles. Surprise bills like these are the hardest balances to collect.
These steps keep patient balances from aging:
- Give an estimate before scheduling, including what happens if a polyp is found.
- Collect known deductibles and copays at check-in.
- Offer payment plans for larger balances instead of sending them to collections.
- Send clear statements that explain screening vs diagnostic charges.
Self-pay and uninsured patients must also receive good faith estimates under the No Surprises Act.
A 90-Day GI Payment Audit
An audit of the last 90 days of claims shows which leak costs your practice the most. Ninety days is long enough to show patterns by payer and procedure, and recent enough that most problems can still be appealed or corrected. Work through these five checks in order.
Sort Denials by Category
Group every denial into the five categories above, then rank them by dollars, not count.
Compare Payments to Contracts
Check a sample of paid claims for each major payer against the contracted rate, starting with your highest-volume procedures.
Review Screening Conversions
Pull every screening colonoscopy that became diagnostic and confirm the codes, modifiers and patient balance were correct.
Check Anesthesia and Facility Claims
Confirm sedation claims match anesthesia records and that ASC and professional claims carry the same dates and codes.
Track Patient Balance Aging
Measure how much patient balance is over 90 days and how much was collected at the visit. Our list of GI revenue cycle KPIs shows what to track monthly.
Want to know which leak hits your practice hardest? MBW RCM can run this GI denial and payment review on your last 90 days of claims and show where the money is going.
Should Your Practice Outsource GI Billing?
Many gastroenterology billing challenges can be fixed in-house when the team has time to track root causes. The difficulty is that denials, underpayments and patient balances each need someone checking them every week.
An experienced GI billing partner works each leak on a set schedule: denials within days, payment variance checks every month and patient balance follow-up before accounts reach 90 days. It also reports results by payer and procedure, so the practice can see progress.
A partner makes sense when denials keep repeating, no one compares payments to contracts, or patient A/R keeps growing. In one GI engagement, MBW RCM reduced A/R by 42 days by working all three leaks together.
Close All Three Leaks, Not Just One
The right gastroenterology payment solution treats denials, underpayments and patient balances as one problem. Fixing denials alone leaves money in underpaid claims and unpaid balances.
In practice, that means fixing denials at the step that causes them, recovering underpayments with the contract in hand and collecting patient balances before they age. Start with the 90-day audit, fix the largest leak first and track the results monthly. For practices that want support, MBW RCM provides gastroenterology billing and coding services that cover all three.