Plans for program expansion are actively being pursued. At the present time, payers of Form W-2 income, wishing to validate employee SSNs, should contact the Social Security Administration (SSA) for information on their SSNVS (Social Security Number Verification Service). Interested parties may find more information about this service by visiting: https://www.ssa.gov/bso/bsowelcome.htm
For additional information see Publication 2108a, Online TIN Matching Program.