When is 25 modifier used?

As per the CPT definition, Modifier 25 should be used along the E/M code when a separately identifiable CPT service is done on the same day by the same physician.                                                                        



The thumb rule is whenever there is a CPT code on the UB form and its status indicator is S or T, then modifier 25 should be appended to E/M code.                                                                                                           

Some of the common procedure that will require use of modifier 25 to the E/M code are:

Any CT, MRI, or Ultrasound,

EKG

Nebulizer Treatments

Infusions or injections



So if you find any of these on your chart you can append modifier 25 to the E/M code