Disclaimer: Certification by the American Board of Sleep Medicine does not in itself confer authority to practice medicine beyond the authority granted by a state that issues a license to practice medicine.
The American Board of Sleep Medicine throughout its history offered non-physicians, specifically PhDs, the opportunity to sit for its examination. Many PhD candidates over the years successfully passed the examination and received the designation "diplomate of the American Board of Sleep Medicine." This designation must not be interpreted to mean that the American Board of Sleep Medicine designation supersedes any state or federal law with regard to medical license requirements for the treatment of patients. Those who have successfully passed the exam MUST be careful not to practice medicine outside of their legal limits.
| Name | City | State | Specialty | Certified |
| Theodossis Zacharis, M.D. | Port Orange | FL | Pulmonology | 9/19/2006 |
| Hubert M. Zachary, Ph.D. | Jacksonville | FL | Psychology | 4/6/1998 |
| Michael J. Zachek, M.D. | Bowling Green | KY | Pulmonology | 4/6/1992 |
| Subooha Zafar, M.D. | Kingston | NY | Pulmonology | 3/22/2005 |
| Muhammad Asif Ali Zaidi, M.D. | Sioux Falls | SD | Neurology | 4/16/2003 |
| Rochelle Schiffman Zak, M.D. | White Plains | NY | Neurology | 4/11/1999 |
| Nasser Zakieh, M.D. | Hinsdale | IL | Pulmonology | 4/16/2003 |
| Mohamed M. Zakkar, M.D. | Beavercreek | OH | Pulmonology | 4/16/2003 |
| George L. Zaldivar, M.D. | Charleston | WV | Pulmonology | 4/24/1989 |
| Sarah Nath Zallek, M.D. | Peoria | IL | Neurology | 4/6/1998 |
| Mohammad Bachar Zalt, M.D. | Pulmonology | 3/23/2005 | ||
| Carlos H. Zambrano, M.D. | Strudesburg | PA | Clinical Neurophysiology | 4/17/2000 |
| Gary Zammit, Ph.D. | New York | NY | Psychology | 4/18/1988 |
| Dragos Gheorghe Zanchi, M.D. | Brandon | FL | Pulmonology | 3/23/2005 |
| Silvio J. Zappasodi, D.O. | Stratford | NJ | Pulmonology | 4/19/1993 |
| Vincent P. Zarcone, M.D. | Palo Alto | CA | Psychiatry | 4/24/1989 |
| Adel A. Zayyad, M.D. | Hickory Hills | IL | Pulmonology | 4/6/1998 |
| Donald Zedalis, M.D. | Christiansburg | VA | Internal Medicine | 4/6/1998 |
| Phyllis C. Zee, M.D., Ph.D. | Chicago | IL | Neurology | 4/23/1990 |
| Boutros Moussa Zeidan, M.D. | Johnstown | PA | Pulmonology | 4/14/2003 |
| Michelle Raphaela Zeidler, M.D. | Los Angeles | CA | Pulmonology | 3/22/2005 |
| Stuart Bruce Zeilender, M.D. | Asheville | NC | Pulmonology | 3/22/2005 |
| Joe Georges Zein, M.D. | Staten Island | NY | Pulmonology | 9/19/2006 |
| Frederick A. Zeller, M.D. | Shelby | NC | Pulmonology | 4/17/2000 |
| Lixin Zhang, M.D. | Williamsville | NY | Neurology | 9/21/2005 |
| Margarita D. Zhavoronkova, M.D. | Rochester | NY | Internal Medicine | 4/16/2003 |
| Peter Leon Zidd, M.D. | Roseburg | OR | Internal Medicine | 3/22/2005 |
| John T. Zimmerman, Ph.D. | Virginia Beach | VA | Psychology | 3/25/1983 |
| Paul Zolty, M.D. | Pittsburgh | PA | Pulmonology | 4/8/2002 |
| Craig Steven Zone, M.D. | Mountain View | CA | Pulmonology | 4/8/2002 |
| Frank Zorick, M.D. | Toledo | OH | Psychiatry | 4/5/1978 |
| Steven K. Zorn, M.D. | West Des Moines | IA | Pulmonology | 4/24/1995 |
| Darius Zoroufy, M.D. | Newport | VT | Internal Medicine | 4/17/2000 |
| Rochelle Zozula, Ph.D. | New Brunswick | NJ | Psychology | 4/11/1999 |
| Tomasz Adam Zurawek, M.D. | Centerville | TN | Pulmonology | 3/22/2005 |
| George Y. Zureikat, M.D. | Grand Blanc | MI | Pediatrics/Pulmonology | 4/11/1999 |
| Muqdad Abdalla Zuriqat, M.B., B.S. | Buckhannon | WV | Pulmonology | 3/22/2005 |