References

1. 1. American Medical Association. cpt 2008, Current Procedural Terminology Professional Edition. Chicago, IL: American Medical Association, 2007; 9-16 CPT codes, descriptions and other data only are copyright 2007 American Medical Association (AMA). All Rights Reserved (or such other date of publication of CPT). CPT is a trademark of the AMA.
2. 2. Highmark Medicare Services. Local Coverage Determination L27548 Acute Care: Inpatient, Observation and Treatment Room Services. Available at www.highmarkmedicareservices.com/policy/mac-ab/127548.html. Accessed July 14, 2008.
3. 3. Cigna. Healthcare Coverage Position: Observation Care. Available at www.cigna.com/customer_care/healthcare_ professional/coverage_positions/medical/mm_0411_coveragepositioncriteria_observation_care.pdf. Accessed July 12, 2008.
4. 4. Centers for Medicare and Medicaid Services. Medicare Claims Processing Manual: Chapter 12, Section 30.6.8. Available at www.cms.hhs.gov/manuals/downloads/ clm104c12.pdf. Accessed July 13, 2008.
5. 5. Pohlig C. Evaluation & Management Services: An Overview. Coding for Chest Medicine 2008. Northbrook, IL: American College of Chest Physicians, 2008; 57-69.
6. 6. Centers for Medicare and Medicaid Services. Medicare Claims Processing Manual: Chapter 1, Section 50.3. Available at www.cms.hhs.gov/manuals/downloads/ clm104c01.pdf. Accessed July 13, 2008.