Does A18.31 require prior authorization?

No, A18.31 does not require prior authorization (high confidence). Code is covered without prior authorization.

`A18.31` — Tuberculous peritonitis

ICD-10-CM

No Prior Auth Required

Code is covered without prior authorization (high confidence)

The medical record must document the medical reasonableness, necessity, and clinical frequency of the diagnostic colonoscopy or sigmoidoscopy and be available to the Contractor upon request.
Documentation must indicate the precise areas scoped and the depth reached during colonoscopy.
Refer to associated LCD L34614 and Medicare IOM for additional coverage and documentation guidance for colorectal cancer screening procedures.
The submitted medical record must support the selected ICD-10-CM code(s), and the submitted CPT/HCPCS code must accurately describe the service performed.

Diagnostic colonoscopy or sigmoidoscopy is covered to directly visualize the lower gastrointestinal tract (colon, rectum, sigmoid) to detect polyps, tumors, or other intestinal lesions.
Diagnostic colonoscopy is covered when identification of the site of pathology and/or obtaining a biopsy during the procedure is clinically indicated.
A follow-on screening colonoscopy is covered after a positive covered blood-based biomarker noninvasive colorectal cancer (CRC) screening test per NCD 210.3, effective 2025-01-01.
For tests that currently lack specific CPT codes (functional intracellular analysis and total antioxidant function), bill using CPT 84999 and add a note identifying which test was performed in the Remarks area for Part A claims and the Narrative area for Part B claims.
Coverage and reasonable/necessary determinations for assays for vitamins and metabolic function are governed by LCD L34914 and claims must meet that LCD's requirements to be covered.
25-hydroxy vitamin D testing (including fractions, if performed) is covered when deemed reasonable and necessary per Local Coverage Determination L33771.

A56394 — Billing and Coding: Colonoscopy and Sigmoidoscopy-Diagnostic

J05

A57484 — Billing and Coding: Vitamin D Assay Testing

J05

L34614 — Colonoscopy and Sigmoidoscopy-Diagnostic

J05

L34658 — Vitamin D Assay Testing

J05

L39995 — Pharmacogenomic Testing

Ask Verity about documentation requirements, denial risks, or coverage in your state.