What this page covers
Gastroenterology and general surgery PA is dominated by scheduling pressure. A hernia case on the OR schedule in 10 days has to clear PA before the facility commits anesthesia and OR staff. A biologic infusion order for Crohn disease has to clear before the patient misses a dose. Both workflows share the same payer delegation map (eviCore, Carelon, direct) but the documentation and urgency differ. This page walks the sub-specialty workflow and where AI agents close the loop.
Gastroenterology: colonoscopy, EGD, ERCP, capsule endoscopy
Screening colonoscopy (45378) usually clears without PA for average-risk adults 45 and over because USPSTF recommends it as preventive care under the ACA. Diagnostic and surveillance colonoscopies (45380, 45385, 45391) are where PA enters: payers want the clinical indication, prior colonoscopy date and findings, and symptom documentation. EGD (43235) requires PA with many MA plans, usually for indications beyond the basic screening set. ERCP (43274-43278) is almost always PA-required and routes through eviCore GI for many plans, with separate documentation requirements for stone extraction vs stent placement vs sphincterotomy.
Capsule endoscopy (91110) is denial-heavy because payers treat it as second-line to EGD and colonoscopy. Documentation of completed EGD and colonoscopy with persistent symptoms is usually required. Motility studies, HIDA scans, and breath tests have payer-specific PA requirements that vary more widely than the endoscopy codes.
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General surgery: hernia, gallbladder, appendectomy, breast
Laparoscopic inguinal hernia repair (49650), open repair (49505), ventral and incisional hernia repair (49652-49656), and umbilical hernia repair (49585) are volume-heavy general surgery PAs. Payers want size, incarcerated or reducible status, and symptom documentation for elective repairs. Cholecystectomy (47562, 47563) requires ultrasound findings, HIDA if non-stone disease, and documentation of biliary symptoms. Elective appendectomy and breast surgery (19120 excision of breast lesion, 19301 partial mastectomy) require imaging and biopsy documentation.
The operational pain in general surgery is that PAs are often required for ASC and HOPD settings but not inpatient, which flips when the case moves location. Flexbone re-validates PA requirements when a case re-routes between facility types.
Colorectal surgery
Colorectal resections (44140 partial colectomy, 44143-44147 colectomy with anastomosis, 45160-45171 rectal excision) require malignancy workup or IBD documentation, staging imaging, and multidisciplinary tumor-board documentation for cancer cases. Hemorrhoidectomy (46250, 46260) and pilonidal cyst excision (11770-11772) are lighter-lift PAs but high volume.
Bariatric surgery
Bariatric PA is the longest documentation window in general surgery. Roux-en-Y gastric bypass (43644), sleeve gastrectomy (43775), and gastric band (43770) usually require 3-6 months of supervised weight loss documentation, nutrition counseling, psychological evaluation, BMI documented over time at thresholds the plan specifies (commonly BMI 40 or BMI 35 with comorbidities), and failed conservative therapy. Many plans also require a contract or participation letter from a bariatric center of excellence. Plans delegate bariatric PA to separate units: Aetna Institutes of Quality, Blue Distinction, Optum Centers of Excellence.
Revision bariatric surgery (43659, 43848) adds complication documentation, weight regain pattern, and often a second psych eval. Adjustable gastric band removal is nearly always covered but still PA'd for scheduling.
Hepatology and IBD biologics
Hepatology PA is dominated by HCV direct-acting antivirals (Mavyret, Epclusa, Harvoni), NAFLD/NASH-related imaging and biopsy, and variceal banding. HCV DAA PAs require viral load, genotype, fibrosis staging (FibroScan or biopsy), prior treatment history, and drug-interaction screening. Plans moved much of HCV treatment PA to specialty pharmacy in 2025.
IBD biologics (Remicade/Inflectra, Humira/Cyltezo, Stelara, Entyvio, Skyrizi, Rinvoq) are a large infusion and injection PA book in GI practices. Step therapy is the norm: most plans require documented failure or intolerance of 5-ASA, corticosteroids, and immunomodulators before approving a biologic, and failure of TNF-alpha inhibitors before approving newer mechanisms. J-code billing and specialty pharmacy coordination apply. See infusion, oncology, and specialty drug PA for the full biologic workflow.
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Payer-specific rules
| Payer | GI PA delegated to | Bariatric PA |
|---|---|---|
| UnitedHealthcare | In-house / Optum | UHC Bariatric Resource Services, Centers of Excellence network |
| Aetna | eviCore GI | Aetna Institutes of Quality, 6-month supervised weight loss required |
| Cigna | eviCore GI | Cigna LifeSOURCE Transplant Network for liver cases |
| Humana MA | eviCore GI | Medicare NCD 100.1 applies for bariatric coverage |
| Anthem / Elevance BCBS | Carelon | Blue Distinction Centers |
| BCBS plans (non-Anthem) | Varies by state | Most require 3-6 month supervised weight loss |
Full detail at commercial payers, BCBS plans, and Medicare, Medicaid, and government payers.
GI and surgery EHRs
- Ambulatory EHRs: athenahealth, eClinicalWorks, NextGen, Allscripts/Veradigm, Greenway Intergy. Details at outpatient EHR PA.
- GI-specific: Provation, gGastro (Modernizing Medicine), Olympus EndoWorks, Pentax. Most capture the endoscopy report that the PA packet needs.
- ASC settings: HST Pathways, SIS Complete, AmkAI, Advantx. See ASC EHRs for PA.
How Flexbone handles GI and surgery PA
For a GI or general surgery practice, the Flexbone deployment reads from the endoscopy report or imaging study, pulls the conservative-therapy and weight-loss documentation for surgical cases, submits through the correct delegate, and chases status against the scheduled OR or infusion date. For phone-only payer lines and peer-to-peer, a voice agent handles the call. See the full workflow at PA workflow guide and the platform at prior authorization automation.
The scheduling collision. GI and general surgery PA failures rarely show up as denials. They show up as OR bumps, which a revenue team only notices when the case re-bills. Flexbone monitors PA status against the actual OR date, so a stuck PA gets escalated before the scheduler finds out the hard way.