This is a potential security issue, you are being redirected to https://csrc.nist.gov.
A limited data set is protected health information that excludes the following direct identifiers of the individual or of relatives, employers, or household members of the individual (i) Names; (ii) Postal address information, other than town or city, State, and zip code; (iii) Telephone numbers; (iv) Fax numbers; (v) Electronic mail addresses; (vi) Social security numbers; (vii) Medical record numbers; (viii) Health plan beneficiary numbers; (ix) Account numbers; (x) Certificate/license numbers; (xi) Vehicle identifiers and serial numbers, including license plate numbers; (xii) Device identifiers and serial numbers; (xiii) Web Universal Resource Locators (URLs); (xiv) Internet Protocol (IP) address numbers; (xv) Biometric identifiers, including finger and voice prints; and (xvi) Full face photographic images and any comparable images. Limited data sets can contain complete dates, age to the nearest hour, city, state, and complete ZIP code.
NISTIR 8053 from 45 C.F.R., Sec. 164.514(e)2 - Adapted