Anesthesia crossover accuracy, colonoscopy add-on optimization, and a dedicated OON negotiation layer built for gastroenterology — so every claim reflects the care you delivered.
Gastroenterology billing involves complex anesthesia crossover rules for endoscopy procedures, where both the gastroenterologist and anesthesiologist must bill correctly to avoid duplicate payment denials. Colonoscopy add-on codes for polyp removal require precise sequencing. Screening vs. diagnostic colonoscopy designation changes reimbursement significantly, and modifier misapplication is the leading cause of GI claim denials.
GI groups performing procedures at multiple facilities frequently encounter OON patients. REL1EF negotiates up to 6× Medicare on endoscopy and colonoscopy procedures — the same procedures that payer vendors routinely reprice to a fraction of billed charges.
The costliest mistake in GI billing is the screening-versus-diagnostic distinction. A true screening colonoscopy (G0121 average risk, G0105 high risk) is a covered preventive benefit, but if a polyp is removed it becomes therapeutic (45380, 45384, 45385) — and the claim must carry modifier 33 for commercial payers or the PT modifier for Medicare so the patient isn't wrongly charged cost-sharing. Getting this wrong generates patient complaints and payer denials in equal measure.
EGD codes (43235–43259) and colonoscopy codes (45378–45385) follow endoscopic multiple-procedure rules where the full value goes to the highest-valued procedure and others are reduced by the difference in base endoscopy value — billers who apply standard multiple-procedure logic underpay themselves. Moderate sedation, when provided by the endoscopist, is separately reportable (99152/99153); when anesthesia is a separate service, MAC documentation and medical necessity drive coverage.
REL1EF codes screening conversions correctly with modifier 33/PT, applies the endoscopic-base reduction properly, and captures sedation revenue that's frequently dropped. On denials we target the GI patterns that age A/R: preventive-to-diagnostic crossover edits, anesthesia medical-necessity reviews, and bundling of biopsy and removal codes — appealing with the procedure note.
Start with the free A/R recovery trial to see our work firsthand — or contact us directly about gastroenterology billing services.
Common questions about GI billing, anesthesia crossover, and colonoscopy coding.
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