Based on this post: http://ficoforums.myfico.com/t5/Rebuilding-Your-Credit/My-turn-Starting-on-DH-s-medical-collection/m...
"We didn't think that we had any medical collections, either, or any collections at all, until we found a collection from a CA known as "558yc00000" on my husband's EQ report. Their actual name is on his TU report. (They didn't report it to EX.) It was from an old out-of-state emergency room visit by one of our daughters, and as far as we knew, it had been paid by insurance (after our co-pay.) Surprise."
It seems like it may be a Medical CA.
........???........
........659 (FICO)........
........659 (TU08) ........
@guiness56 wrote:If you get your reports directly from the CRAs, such as annualcreditreport.com, it won't be masked.
It is more than likely a medical collection.
+1 You can contact the CRA and they will give you the information.
July 2013 score: EQ FICO 819, TU08 778, EX "806 lender pull 07/26/2013
Goal Score: All Scores 760+, Newest goal 800+
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Current scores after adding $81K in CLs and 2 new cars since July 2013
EQ:809 TU 777 EX 790 Now it's just garden time!
June 2017 update: All scores over 820, just pure gardening now.