The "homepage" for all kinds of CE-marking can be found at the New Approach
There is also a list of the harmonized standards
EN 980 was revised and published last year and is the newest standard for the use of symbols on medical devices and IVDs.
This new document replaces EN 980:1996, EN 980:1996/A1:1999, and EN 980:1996/A2:2001. It also includes new IVD symbols.
ISO 15223:2000 is not listed in the harmonized standards of the EG directives.
And we advice device manufacturers to use the new EN 980 for labelling questions.
p.s. For CE marking you should follow EN 980 (because this is an EN), FDA Recognizes Selected ISO 15223 and EN 980 Medical Device Symbols and has recently issued a Draft
pp.s. There is also an EN 1041 "Information supplied by the manufacturer with medical devices "