Thanks for mentioning Katie - I'll definitely contact her if I can't figure this out soon.
As far as your other thoughts: well, I think I have been entering it through the summary sheet (for new-to-me pts who have already had their Pneumovax elsewhere), and it's showing up on the plan (as though it was given that day, even though I'm entering the approximate date it was given: e.g., "10/01/2008"). I have NOT been adding a CPT since I wasn't the one that gave the vax ... so maybe I need to do that. Thanks - that's a very helpful thought.