SF is a valid 2023 HCPCS Modifier that could be used to indicate Second opinion ordered by a professional review organization (pro) per section 9401, p.l. 99-272 (100% reimbursement - no medicare deductible or coinsurance).
SF Modifier has been in effect since Jan 01, 1997.
Short description for SF HCPCS Modifier code:
2nd opinion ordered by pro