Does Q42.9 require prior authorization?

No, Q42.9 does not require prior authorization (high confidence). Covered without prior authorization.

`Q42.9`, Congenital absence, atresia and stenosis of large intestine, part unspecified

ICD-10-CM

No Prior Auth Required

Covered without prior authorization (high confidence)

This billing and coding article provides guidelines that complement Local Coverage Determination L34415 for CT of the abdomen and pelvis; consult LCD L34415 for specific coverage indications, limitations, and documentation requirements.
When performed for surveillance of colonic neoplasia, report the appropriate CPT/HCPCS procedure code and the appropriate primary ICD-10-CM code plus one of the following secondary diagnosis codes: Z85.038, Z85.048, Z86.0100, Z86.0101, Z86.0102, or Z86.0109.
For high-risk post-surgical follow-up at 1 year (with continued 24-month screening eligibility), report HCPCS code G0105 as the appropriate screening/high-risk colonoscopy code.

Colonoscopy/sigmoidoscopy/proctosigmoidoscopy is covered for surveillance of colonic neoplasia in patients with a history of colorectal cancer or colonic polyps.
A follow-up procedure is covered 1 year after surgery for treatment of colorectal cancer when the patient is identified as high-risk for colon cancer and is eligible for continued screenings.
Preventive screening: Virtual colonoscopy using computed tomography (CT colonography) performed every 5 years is medically necessary as a preventive service for colorectal cancer screening of average-risk asymptomatic persons 45 years of age or older.
Diagnostic CT colonography (virtual colonoscopy) is medically necessary for colonic evaluation of symptomatic members with a known colonic obstruction when standard optical colonoscopy is contraindicated.
Diagnostic CT colonography is medically necessary for colonic evaluation of symptomatic members with an incomplete colonoscopy (e.g., due to diverticulosis, obstructive or stenosing colonic lesions, or redundant colon).
CPT/HCPCS/ICD-10 code-based coverage (covered if selection criteria are met): CT colonography diagnostic CPTs 74261, 74262; CT colonography screening CPT 74263.

ANTHEM-CG-RAD-28, Transrectal Ultrasonography

AETNA-CPB-0535, Virtual Gastrointestinal Endoscopy

A56421, Billing and Coding: CT of the Abdomen and Pelvis

A56632, Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy