This article is from the NYPD Blue FAQ, by Dave Chapman, Alan Sepinwall and Jeff Knapp with numerous contributions by others.
In "Heavin' Can Wait," the episode about the fall-out from
Diane's fall off the wagon, Andy gets upset because Diane
called Bobby instead of him. He tells Bobby, "I'm her
This has turned into a fairly hot topic for discussion among
fans. Some claim that AA frowns in the extreme on opposite
gender sponsors, as well as sponsoring someone that you work
with. Others say that while sponsor/sponsee arrangements like
this aren't the norm, they do exist, and can be very
As far as we've been told, Andy hasn't taken on a new sponsor
since Dan Breen was killed in the middle of season two. But
whether or not he does have a new sponsor, it's highly
unlikely that Diane would be filling that role, even if she
did act as the "voice of AA" when Andy fell off the wagon
after Andy Jr's death.