Bilateral procedures are identical procedures (i.e., you use the same CPT code) performed on the same anatomic site but on opposite sides of the body. Note: Modifier –50 does not apply to radiology procedures.
-51 Multiple Procedures
ICD 10 training online focuses on these in detail for medical billing. It is applicable when unrelated procedures are performed during the same operative session or when multiple related procedures are performed and there is no single inclusive code available. List the major procedure or service (most revenue intensive) first on the HCFA-1500 claim form, than attach modifier –51 to each applicable secondary procedure code.