Is there a way in some standard UML diagram to indicate which classes actually have code to implement the methods?

I'm faced with several situations in documenting and fixing an existing class hierarchy designed and developed by another developer that is no longer around. where I need a diagram to make life easier

1) an abstract method is defined in a superclass and whether or not it's implemented in each subclass

2) a subclass contains code for an inherited method

3) a class defines a method, but doesn't have code in the method (it's not really an abstract method it's an error in the design)