Gastroenterology Billing
Specialized Gastroenterology Billing Services for High-Volume GI Practices
GI billing is high-stakes, high-volume, and full of distinctions that matter financially. Whether a colonoscopy is screening or diagnostic determines the patient’s cost-sharing on every single case. Whether a polypectomy add-on code is applied determines whether you collect the full value of a therapeutic procedure. Theiatrics manages every distinction correctly across your entire case volume.
GI Services Theiatrics Bills For
- Screening and diagnostic colonoscopy billing
- Polypectomy and biopsy add-on code billing
- Upper endoscopy (EGD) and intervention billing
- ERCP with therapeutic add-on codes
- Capsule endoscopy and enteroscopy billing
- Flexible sigmoidoscopy billing
- Anorectal procedure billing (anoscopy, hemorrhoid treatment)
- Liver biopsy and hepatology procedure billing
- IBD biologics infusion billing (J-codes and administration)
- Motility study billing (manometry, pH monitoring)
- GI office visit and chronic disease management billing
- Infusion therapy billing for GI conditions
⚠️ Screening vs. Diagnostic: The #1 GI Billing Decision
The coding distinction between screening and diagnostic colonoscopy affects both your reimbursement and your patient’s cost-sharing on every single colonoscopy claim. Getting it wrong costs money on both sides. Theiatrics applies the correct code based on the indication, payer, and whether a therapeutic intervention was performed during the same session.
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What Makes Gastroenterology Billing Services Uniquely Demanding?
Gastroenterology is one of the highest-volume procedure specialties in outpatient medicine, and GI billing carries a level of consequence per claim that is higher than most. A colonoscopy takes 20 to 45 minutes to perform. The billing decision around whether it is coded as screening or diagnostic, and whether polypectomy add-on codes are correctly applied, can change the reimbursement amount by hundreds of dollars and the patient's cost-sharing by thousands. For a GI practice performing 100 colonoscopies per month, systematic errors in any of these coding decisions compound into significant annual revenue loss or compliance exposure.
The screening versus diagnostic colonoscopy distinction is the most financially significant billing decision in all of GI. For Medicare patients, a screening colonoscopy that finds and removes a polyp should be billed with a modifier that preserves the screening benefit and eliminates the patient's cost-sharing for the therapeutic portion. For commercial payers, policies on this scenario vary significantly and have been changing as federal regulations evolve. Applying the wrong approach for any payer reduces reimbursement and can create patient satisfaction issues when unexpected bills arrive.
Endoscopy add-on codes are the second most impactful billing opportunity in GI. When a gastroenterologist removes a polyp during a colonoscopy, the polypectomy must be billed in addition to the base colonoscopy code using the appropriate add-on code based on the removal technique. Failing to add these codes is the most common source of revenue leakage in high-volume GI practices. The same principle applies to upper endoscopy — biopsies and other interventions performed during an EGD require add-on codes that are frequently omitted.
Theiatrics brings the GI-specific billing expertise to manage every one of these decisions correctly across your entire procedure volume, from straightforward screening colonoscopies to complex ERCP cases and IBD biologics infusions.
Screening vs. Diagnostic Colonoscopy: The Distinction That Drives GI Revenue
Screening Colonoscopy
Performed on an asymptomatic patient as a preventive service to detect colon cancer or precancerous lesions. The patient has no symptoms and no recent positive non-invasive test result. For Medicare, a screening colonoscopy that converts to a therapeutic procedure (polyp removal) uses modifier PT on the therapeutic code to preserve the screening benefit.
Diagnostic Colonoscopy
Performed because the patient has GI symptoms, a positive stool DNA or FIT test result, a personal history of polyps or colorectal cancer, or a family history that increases their risk. Diagnostic colonoscopies are subject to standard patient cost-sharing (deductible and coinsurance) rather than the reduced or zero cost-sharing that applies to preventive screenings.
When a screening finds a polyp: For Medicare patients, if a screening colonoscopy requires polypectomy, the claim is billed with the therapeutic code (such as 45385 for snare polypectomy) rather than the base colonoscopy code, with modifier PT appended to indicate the procedure began as a screening. This preserves the patient’s waived cost-sharing for Medicare. For commercial payers, the policy on this scenario varies by plan and has been evolving under federal guidance — Theiatrics applies the correct payer-specific approach for every case in your practice.
Key Gastroenterology CPT Code Families We Work With Daily
Colonoscopy
Upper Endoscopy (EGD)
ERCP
Capsule & Enteroscopy
Anorectal & Other GI
GI Infusion & E&M
Our Complete Gastroenterology Billing Services
Screening vs. Diagnostic Colonoscopy Coding
We apply the correct screening code (G0121, G0105) or diagnostic code (45378) based on the documented indication, and apply modifier PT for Medicare when a screening converts to a therapeutic procedure, preserving the patient’s preventive benefit.
Polypectomy & Endoscopy Add-On Billing
We capture every applicable add-on code when biopsies, polypectomies, ablations, or other interventions are performed during colonoscopy or EGD. The removal technique determines which add-on code applies, and we select it from the procedure documentation, not from a default assumption.
ERCP Therapeutic Code Stacking
We bill the base ERCP code plus all applicable therapeutic add-on codes for sphincterotomy, stone extraction, stent placement, balloon dilation, and other interventions documented in the operative record, capturing the full value of complex ERCP cases.
IBD Biologics Billing & Authorization
We manage J-code billing for infliximab, vedolizumab, ustekinumab, ozanimod, and other IBD therapies alongside infusion administration codes, with prior authorization requests documenting diagnosis, disease severity, and step therapy history for each payer.
Prior Authorization Management
We obtain prior authorizations for capsule endoscopy, IBD biologics, and other services requiring payer approval, tracking authorization expiration and renewals for ongoing therapy patients to ensure no session is administered without confirmed coverage.
Eligibility & Benefits Verification
We verify insurance eligibility and GI-specific procedure coverage before each scheduled procedure, confirming preventive versus diagnostic coverage rules, deductible status, and any payer-specific requirements that affect how the colonoscopy or endoscopy should be billed.
Denial Management & Appeals
When a claim is denied, we identify the root cause, correct the issue, and resubmit within 48 hours. For screening reclassification denials where payers attempt to recode a screening as diagnostic, we prepare appeals citing the applicable federal and payer-specific coverage rules.
AR Follow-Up & Collections
We work all unpaid and underpaid GI claims systematically, with particular attention to high-dollar ERCP, therapeutic colonoscopy, and IBD infusion claims where payment delays have the greatest cash flow impact. No aging account is left without active follow-up.
Revenue Cycle Reporting
You receive regular reports on collection rates by procedure type, screening versus diagnostic code distribution, denial root cause analysis, add-on code capture rates, and IBD biologics authorization performance so your practice has complete financial visibility.
Gastroenterology Billing Across All GI Subspecialties and Service Types
Colonoscopy
Screening and diagnostic colonoscopy billing with polypectomy, biopsy, and ablation add-ons, and modifier PT for Medicare screening conversions.
Upper Endoscopy
EGD billing for diagnostic and therapeutic upper endoscopy with biopsy, dilation, hemostasis, and ablation add-on codes based on procedure documentation.
ERCP
Complex ERCP billing with all applicable therapeutic add-ons for sphincterotomy, stone extraction, stent placement, and balloon dilation documented in the operative report.
IBD Management
Crohn’s disease and ulcerative colitis biologics billing including infliximab, vedolizumab, and ustekinumab infusions with step therapy prior authorization.
Hepatology
Liver biopsy, hepatitis C treatment monitoring, cirrhosis management visits, and chronic liver disease follow-up billing for combined GI and hepatology practices.
Capsule Endoscopy
Capsule endoscopy billing for small bowel and esophageal imaging with prior authorization management and professional versus technical component billing.
Anorectal
Anoscopy, hemorrhoid treatment, flexible sigmoidoscopy, and anorectal manometry billing with correct anatomical site and intervention-specific code selection.
Motility Studies
Esophageal and gastric motility study billing including manometry, pH monitoring, and impedance testing for dysmotility and reflux evaluation.
Gastroenterology Billing Challenges We Solve Every Day
Screening vs. Diagnostic Miscoding
Billing a screening colonoscopy as diagnostic, or failing to apply modifier PT when a Medicare screening converts to therapeutic, affects both reimbursement and patient cost-sharing on every single colonoscopy claim. For a high-volume GI practice, systematic errors here compound into significant annual revenue loss and patient billing complaints.
How we help: We review each colonoscopy’s documented indication before coding, applying the correct screening code or modifier PT for Medicare conversions, and applying the correct payer-specific approach for commercial plans where the rules differ.
Missing Polypectomy Add-On Codes
When a polyp is removed during a colonoscopy, the polypectomy must be billed as an add-on to the base colonoscopy code. Many high-volume GI practices either omit these add-on codes entirely or apply the wrong technique-based code (snare vs. cold biopsy vs. hot biopsy), resulting in systematic underbilling on every therapeutic case.
How we help: We review the removal technique documented in every colonoscopy procedure note and apply the correct add-on code (45380, 45384, 45385, or 45388) based on what was documented, ensuring the full value of every therapeutic case is captured.
Incomplete ERCP Therapeutic Coding
ERCP is one of the highest-value procedures in GI, and it routinely involves multiple therapeutic maneuvers beyond the base diagnostic code. Each additional maneuver — sphincterotomy, stone extraction, stent placement — has its own add-on code. Practices that bill only the base ERCP code without stacking the applicable add-ons are undervaluing their most complex cases.
How we help: We review every ERCP procedure note for all interventions performed and apply the complete set of applicable therapeutic add-on codes based on the documented maneuvers, capturing the full billing value of such complex ERCP case.
IBD Biologics Authorization Denials
Infliximab, vedolizumab, and other IBD infusion biologics require prior authorization from virtually all commercial payers, including step therapy documentation showing the patient tried and failed conventional treatments. Administering without authorization leaves the practice absorbing the full cost of an expensive drug without reimbursement.
How we help: We manage the full IBD biologics authorization cycle from initial request through renewal, compiling step therapy documentation, tracking authorization expiration, and submitting renewals proactively so no infusion session is administered without confirmed payer approval.
Capsule Endoscopy Prior Authorization
Capsule endoscopy frequently requires prior authorization, and payers typically require documentation that conventional endoscopy has been performed and was insufficient, or that there is a specific clinical indication for small bowel imaging that cannot be addressed by standard upper or lower endoscopy. Missing these documentation requirements results in denial.
How we help: We manage capsule endoscopy prior authorization requests including the clinical documentation requirements for each payer, and track approval status before each procedure is scheduled so no study is performed without coverage confirmation.
NCCI Bundling on Same-Day Procedures
When multiple GI procedures are performed in the same session, NCCI edits may bundle certain code combinations. For example, billing both a colonoscopy and a flexible sigmoidoscopy on the same day without proper modifier support results in automatic denial of the lesser-valued code. GI practices with high same-day procedure volumes need systematic bundling review on every claim.
How we help: Every GI claim is reviewed against current NCCI edits before submission. When multiple procedures are legitimately performed and separately billable, we apply the correct modifiers. When bundling applies, we ensure the claim reflects accurate coding that processes correctly the first time.
Why GI Practices Choose Theiatrics for Billing
How High-Volume GI Billing Errors Compound
GI billing errors are uniquely dangerous because they compound across volume. A single missed polypectomy add-on code represents a modest billing shortfall on one case. But a GI practice performing 150 colonoscopies per month where 40% involve polypectomy, and the add-on code is routinely missed, is absorbing approximately $60 to $120 in underpayment per affected case. At scale, that represents $36,000 to $72,000 in annual revenue loss from a single missed add-on code applied systematically.
Add screening versus diagnostic miscoding that misclassifies 20% of cases, incomplete ERCP therapeutic add-on billing on complex cases, and IBD infusion denials for missing authorization, and the total annual revenue gap at a mid-size GI practice typically ranges from $100,000 to $300,000. These are not exotic errors. They are exact billing patterns that Theiatrics identifies and corrects in our first 12-month claims audit for every new GI client.
Ready to Maximize Your GI Practice Revenue?
Let Theiatrics handle the screening versus diagnostic coding, polypectomy add-ons, ERCP therapeutic stacking, IBD biologics authorization, and denial management that high-volume GI billing demands. Start with a free billing review today.
Schedule My Free Audit →Answers to What Gastroenterology Billing Providers Ask Us Most
Answers to the questions GI physicians, practice managers, and billing directors ask us most when evaluating specialized billing support for their gastroenterology practice.
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