What Does The D Mean In A Medicare Number? 
The letter D is part of some claim numbers . A plain letter D means `` Aged Widow , age 60 or over '' . D1 means `` Aged Widower , age 60 or over '' . D2 means `` Aged widow , second claimant '' . D3 means `` Aged Widower , second claimant '' . D6 means `` Surviving Divorced Wife , age 60 or over '' . 