NEW information: non-physician practitioners cannot bill for the TC portion of radiology procedures. Retroactive 1/1/2013.
You were correct to bill with the TC modifier, but you can only bill under the supervising/Doc of the day-MD's NPI# as NP's cannot bill the technical component, it's not within their scope of practice.
PER CMS:
This is effective for those claims that are billed as non-incident to the physician's service. When the PA or NP is listed as the servicing or rendering provider, it has been determined that billing the technical component of an x-ray is not within the PA/NP scope of practice. If the PA/NP billing is submitted to Medicare as a non-incident to service, the PA/NP NPI can be reflected as the servicing or rendering provider for the professional component of the x-ray using the AMA-CPT code for the x-ray and Modifier 26. The technical (TC) component must be submitted showing the NPI of the supervising MD/DO on another line of the claim. For example:
CPT Code Servicing/Rendering Prov.
71010-26 PA/NP NPI #
71010-TC MD/DO NPI#
A claim submitted reporting an MD NPI for medically necessary x-rays will be covered. In addition, claims submitted whereby the PA/NP is providing care as “incident to” the MD/DO would not need multiple lines for the global reimbursement for an x-ray.
Additional guidance can be found in the Centers for Medicare & Medicaid Services (CMS) Internet Only Manual (IOM) Publication 100-02, Medical Policy Benefit Manual, Chapter 15, Section 80.