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Screening Colonoscopy v/s Diagnostic Colonoscopy

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Medicare covers screening Colonoscopy once every 24 months for high-risk patients and for patients not at high risk, once every ten years (120 months), or four years (48 months) after a previous flexible sigmoidoscopy.




Screening colonoscopy recommended for patients

  • Aged 50-85 years

  • Asymptomatic

  • Average colorectal cancer risk

When a screening colonoscopy transitions to a diagnostic colonoscopy, medical records must indicate:

  • Medical reasonableness, necessity, and frequency of each diagnostic service supplied

  • Colonoscopy report must describe maximum depth of penetration, description of abnormal findings and any procedures performed from the findings (e.g., biopsy).

  • Append -PT modifier to CPT indicating screening colonoscopy switched to diagnostic colonoscopy.


Diagnostic colonoscopy recommended for patients

  • Abnormality determined by radiology exam consistent with colonic lesion

  • Abnormal oncology colorectal screening or stool-based DNA test

  • Unexplained gastrointestinal bleeding:

    • Hematochezia not from rectum or perianal source

    • Melena of unknown origin

    • Presence of fecal occult blood

    • Unexplained iron deficiency anemia

  • Clinically significant diarrhea of unexplained origin

  • Needs evaluation of acute colonic ischemia or ischemic bowel disease

  • Needs evaluation due to streptococcus bovis endocarditis when source determined to be colonic origin

  • Clinical suspicion of inflammatory bowel disease

  • Known chronic inflammatory bowel disease of the colon when a more precise extent of disease determination will influence treatment

  • Surveillance of Crohn’s colitis or chronic ulcerative colitis to rule out colorectal cancer

  • Surveillance of colonic neoplasia

Sources: Noridianmedicare

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