CPT Code 99999: Unlisted procedure, general

CPT 99999 is used for general medical procedures or services not described by any existing CPT code. It’s often used for new, rare, or experimental procedures pending formal code assignment.

Payers, including Medicare, may cover CPT 99999 if the service is medically necessary and documentation supports its use. However, coverage is determined on a case-by-case basis and is subject to manual review.

Many payers require preauthorization or prior review for unlisted codes like 99999. Always check payer-specific requirements before performing the service.