E/m with ekg/nebulizer

I work in a family care office, and was questioning the proper use of the modifier 25. If we see a patient in the office due to chest pain and the provider deems it medically necessary to perform and read an EKG (93000), do we need a modifier 25 to the office visit, or is considered bundled?

Or, if we see a patient for an URI, and the provider deems it medically necessary for them to receive a nebulizer treatment can we bill for the office visit with modifier 25 and the nebulizer treatment (94640)? Or is that unbundling?

Please help!!!

E/m with ekg/nebulizer