Per Medicare Transmittal 2636
Date: January 16, 2013
"The Internet Only Manual, Claims Processing Manual, Publication 100-04, Chapter 12, Section 30.6.12(I) requires a provider to report CPT code 99292 (Critical care, evaluation and management of the critically ill or critically injured patient; each additional 30 minutes (List separately in addition to code for primary service)) without its primary code CPT code 99291 (Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes) if two or more physicians of the same specialty in a group practice provide critical care services to the same patient on the same date of service. For the same date of service only one physician of the same specialty in the group practice may report CPT code 99291 with or without CPT code 99292, and the other physician(s) must report their critical care services with CPT code 99292."