Does A18.81 require prior authorization?

No, A18.81 does not require prior authorization (high confidence). Covered without prior authorization.

`A18.81`, Tuberculosis of thyroid gland

ICD-10-CM

No Prior Auth Required

Covered without prior authorization (high confidence)

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.
The medical record must include the legible signature of the physician or non-physician practitioner responsible for and providing the care.
When billing CPT 84999 for the listed tests, include a note identifying the specific test in the Remarks (Part A) or Narrative (Part B) area of the claim.
All documentation must be maintained in the patient's medical record, be legible, include patient identification (e.g., complete name) and dates of service, and be made available to the contractor upon request.

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.
No specific clinical indications are listed in this billing/coding guidance; coverage determinations for MRI of the head and neck follow Local Coverage Determination L34425.
25-hydroxy vitamin D testing (including fractions, if performed) is covered when deemed reasonable and necessary per Local Coverage Determination L33771.
Vitamin D assay testing is payable under Medicare Part B when performed in an office (POS 11), independent clinic (POS 49), Federally Qualified Health Center (POS 50), or independent laboratory (POS 81).
Non-physician practitioners (e.g., nurse practitioners, clinical nurse specialists, physician assistants) may certify, order, and establish the plan of care for Vitamin D assay testing as authorized by State law (outpatient settings other than CORFs).

WPS-J5-L34658, Vitamin D Assay Testing

A57484, Billing and Coding: Vitamin D Assay Testing

NGS-J6-L39995, Pharmacogenomic Testing

A57736, Billing and Coding: Vitamin D Assay Testing

A59915, Billing and Coding: Pharmacogenomic Testing

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