30901-XS or 59 is the modifier number.
A CPT® or HCPCS Level II code may have two additional characters (letters or integers) applied to it. Without altering the code's meaning, the modifier offers more details about the medical treatment, service, or supply in question.
CPT modifiers, also known as Level I modifiers, are used to add to or modify care descriptions in order to provide more information about a medical professional's operation or service. Code modifiers assist in expanding on a process code's definition without altering it.
The Healthcare Common Procedure Coding System (HCPCS) or Current Procedural Terminology (CPT®) codes are modified to offer additional information required for filing a claim, such as explaining why a doctor or other qualified healthcare professional provided a certain service and procedure.
To know more about Current Procedural Terminology refer to: https://brainly.com/question/9958016
#SPJ4