- A bladder ultrasound is performed and if any urine is present the patient is asked to void into a jug and this is measured. The difference between the volume in the bladder according to the scan and the volume of voided urine gives the residual volume;
It might be best to start by showing you exactly where these new G codes will go on the claim form. See pic below. Where the codes go. Highlights (refer to the pic above of a physical therapy billing g codes on a claim): 1  The G codes go in the same column as your CPT codes but do not carry with it any charges. 2  The C modifier goes into one of the four âmodifiersâ column.
CPT Modifier GA, GX, GY or GZ. The GA modifier should be used when physicians, practitioners, or suppliers want to indicate that they expect Blue Cross of Idaho will deny a service as not reasonable and necessary and they do have an Advanced Beneficiary Notice (ABN) signed by the member.