Fiberoptic Endoscopic Evaluation of Swallowing

Langmore FEES

Landmarks in the Development of FEES

First publication: Langmore, Schatz, and Olson, Dysphagia, 1988.
FEES was first developed in response to a need for a more portable exam to replace the bedside clinical exam for inpatients. As its value as a stand-alone exam became better appreciated and as technology advanced, FEES has evolved to the point where today FEES is a standard instrumental exam that is widely done throughout the US and internationally.

FEES included in the SLP scope of practice by ASHA, 1991.
By identifying FEES as an evaluation procedure that is within the scope of practice of SLPs, ASHA established its credibility. They emphasized that training is needed to perform and interpret the exam and followed this document with a Position Statement on the role of the SLP and further documents that provided Knowledge and Skills needed to perform the exam. The ASHA website has these documents available to anyone.
FEES made a billable CPT procedures, 1994 (CPT - 92612)
In 1994, The Centers for Medicare and Medicaid Services determined that FEES should have its own CPT code, thus establishing it as a procedure that is separate and distinct from other procedures that utilize a laryngoscope.  From that time on, FEES was no longer confused with CPT code # 31575, Diagnostic Laryngoscopy, as typically performed by otolaryngologists as their standard laryngoscopy exam to assess for laryngeal pathology.

Textbook on FEES published 2001. 
A good resource for learning more about FEES is my textbook:
Langmore, Susan E.  Fiberoptic Endoscopic Evaluation and Treatment of Swallowing Disorders. Thieme Medical Publishers, 2001.