How do you properly bill a screening colonoscopy that becomes diagnostic in Texas?
Under federal ACA guidelines and Medicare regulations enforced by Novitas Solutions in Texas, when an asymptomatic screening colonoscopy (HCPCS G0105/G0121 or CPT 45378) results in finding and removing a polyp or lesion, the billing rules change depending on payer type. For Medicare Part B patients, bill the diagnostic procedure code (e.g. CPT 45385 for snare polypectomy or CPT 45380 for biopsy) appended with Modifier -PT (colorectal cancer screening test converted to diagnostic test), which waives the patient's Part B deductible. For commercial plans (such as BCBSTX, UnitedHealthcare, Aetna), bill the diagnostic surgical code with Modifier -33 (preventive service), indicating that the encounter originated as an ACA-mandated preventive screening so the patient is not hit with unexpected cost-sharing.
1. The High Stakes of Texas Colorectal Cancer Screening Billing
Colorectal cancer screening is one of the most heavily scrutinized areas in medical billing due to patient cost-sharing protections under the Affordable Care Act.
Patients expect $0 out-of-pocket costs for preventative screenings. Misapplying modifiers results in patients receiving unexpected $1,500+ bills for deductible and coinsurance, damaging practice reputation and prompting TDI complaints.
2. Multiple Endoscopy Rule Deductions
Calculating payment for complex endoscopy sessions
When multiple endoscopic procedures are performed during the same session, Medicare and commercial plans apply the multiple endoscopy rule:
• The highest-valued procedure is reimbursed at 100% of the allowable fee schedule.
• Subsequent procedures are reimbursed by taking the code's fee and subtracting the base endoscopy allowance (CPT 45378), preventing double-payment for insertion and scope advancement.