GI billing combines high-volume endoscopy procedures, pathology coordination, anesthesia interface billing, and complex bundling rules that trip up most billers.
Common Billing Challenges
These are the six billing failure points we see most often — and the ones our team resolves systematically from day one.
When a colonoscopy converts from screening to diagnostic (polyp found), the billing changes — modifier PT (ACA), -33, and the correct diagnostic CPT must all be applied or you leave money on the table.
GI practices that perform their own pathology need correct 88300-series codes. Practices using outside pathology labs must coordinate billing to avoid duplicate claims and patient confusion.
MAC anesthesia for endoscopy requires coordination between the GI physician, anesthesiologist, and facility — each billing correctly for their component with no overlap.
ERCP, EUS, capsule endoscopy, and Bravo pH studies require prior authorization with specific clinical documentation. We manage auth for every scheduled high-value procedure.
Colonoscopy and EGD on the same day require modifier 51 or 59 depending on payer and the specific code combination. Incorrect modifier usage causes automatic bundling denials.
Biologic infusions for IBD (Remicade, Entyvio) are among the highest-reimbursed GI services — and among the most frequently denied due to prior auth gaps and incorrect J-code billing.
Key Procedure Codes
Our coders hold specialty-specific credentials and train continuously on the codes that drive the most revenue — and the most denials — in that specialty.
| CPT Code | Description | Common Issue |
|---|---|---|
| 45378 | Colonoscopy, diagnostic | Modifier PT + diagnostic conversion |
| 45385 | Colonoscopy with polypectomy | Separate billing entity coordination |
| 43239 | EGD with biopsy | Component coordination + MAC |
| 43270 | EGD with dilation | Clinical documentation package |
| 44388 | Colonoscopy via stoma | Modifier 51/59 same-day rules |
| 43240 | EGD with transmural drainage | Prior auth + J-code billing |
Why Rcmaxis
We're not a generalist billing service that added a specialty module. Our team is built around specialty-specific expertise.
Every coder on your account holds the specialty coding credential relevant to your field — not a generic CPC only.
Significantly above the 11.4% industry denial rate for your specialty. Fewer rejections means faster payment and less write-off risk.
Full EHR integration, payer enrollment verification, and charge capture setup in 2 weeks — with zero disruption to your clinical schedule.
One point of contact who knows your practice, your payers, and your billing history — available for weekly calls and monthly performance reviews.
Month-to-month engagement. We earn your business every month by improving your collections — not by locking you in.
Live visibility into your collections, denial rate, aging AR, and payer performance — updated daily, reviewed monthly with your account team.
Straight answers to what practices usually ask before they switch.
Free revenue assessment for qualified practices. We audit your last 90 days of claims, identify every revenue leak, and show you a clear path to better collections — at no cost.