Clinical Reference Laboratory provides lab tests for Massachusetts Mutual Life Insurance policy applicants. On September 17, they learned that a billing sent to MassMutual on September 6 with applicants’ names, dates of birth, type of lab test performed, and/or partial or full Social Security numbers had been damaged in transit with USPS and some pages were missing.
Copies of their notification letters to those affected are available on California Attorney General’s web site. Those affected were offered services with Equifax Gold Watch.
Update: the breach was also reported to New Hampshire here and here.