A covered colonoscopy that is attempted but cannot be completed because of extenuating circumstances is considered to be an incomplete colonoscopy (the inability to advance the colonoscope to the cecum or to the colon-small intestine anastomosis due to unforeseen circumstances). The failed procedure is billed and paid using CPT® code 45378, HCPCS code G0105 or G0121, or CPT® code 44388, if attempting to perform the colonoscopy through an existing stoma. Modifier “-53” (discontinued procedure) must be appended to any procedure code submitted when billing for a failed colonoscopy attempt.
When a covered colonoscopy is next attempted and completed, Medicare will pay for that colonoscopy according to its payment methodology for this procedure, as long as all coverage conditions are met. This applies to both screening and diagnostic colonoscopies.