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 |
| Michael J. Labanowski, M.D. | Dothan | NM | Neurology | 4/19/1993 |
| Dennis Michael Lacey, M.D. | Atlanta | GA | Neurology | 4/23/2001 |
| William O. Lacy, M.D. | Louisville | KY | Pulmonology | 4/17/2000 |
| Robert Arne Lada, M.D. | Hudson | OH | Neurology | 3/23/2005 |
| Franco Laghi, M.D. | Burr Ridge | IL | Pulmonology | 4/16/2003 |
| Henry Lahmeyer, M.D. | Chicago | IL | Psychiatry | 3/31/1984 |
| Laura Elaine Lajos, Ph.D. | Baton Rouge | LA | Clinical Psychology | 3/23/2005 |
| Robert C. Lakin, M.D. | Witchita | KS | Pulmonology | 4/17/2000 |
| Salvadeeswaran Lakshmi-Narayanan, M.B., B.S. | Santa Fe | NM | Pulmonology | 3/22/2005 |
| Chitra Lal, M.D. | Machias | ME | Pulmonology | 9/19/2006 |
| Deepa Shyam Lala, M.D. | Roanoke | VA | Pulmonology | 9/21/2005 |
| Kelvin Nhon-Tro Lam, M.D. | Boston | MA | Pulmonology | 9/19/2006 |
| Victor Lam, M.D. | San Antonio | TX | Pulmonology | 4/29/1991 |
| Richard J. Lambert, M.D. | Spokane | WA | Pulmonology | 4/16/2003 |
| Carin Lamm, M.D. | New York | NY | Pediatric Pulmonology | 4/28/1997 |
| Austin Charles Lampert, M.D. | Olympia | WA | Pulmonology | 4/8/2002 |
| Charlie Kuo Wei Lan, D.O. | Houston | TX | Internal Medicine | 9/21/2005 |
| Lisa Hood Lancaster, M.D. | Nashville | TN | Pulmonology | 4/17/2003 |
| Colleen Gail Lance, M.D. | Southside Place | TX | Internal Medicine | 3/25/2004 |
| Yaroslav Lando, M.D. | Lititz | PA | Pulmonology | 4/23/2001 |
| Bianca Julie Lang, M.D. | Indianapolis | IN | Pulmonology | 3/22/2005 |
| Courtney Donnelle Langdon, M.D. | Kansas City | MO | Pulmonology | 9/19/2006 |
| Neale R. Lange, M.D. | St. Louis | MO | Pulmonology | 4/23/2001 |
| D. Alan Lankford, Ph.D. | Atlanta | GA | Psychology | 6/26/1987 |
| Karl Ignatius Lanocha, M.D. | Hopkinton | NH | Psychiatry | 3/23/2005 |
| Robert J. Lapidus, M.D. | Denver | CO | Pulmonology | 4/14/2003 |
| Anne Virginia LaRaia, M.D. | Marblehead | MA | Pulmonology | 9/19/2006 |
| Thomas M. Laton, D.O. | Hermitage | PA | Psychiatry | 4/25/1994 |
| Bradley Lauderdale, M.D. | Neenah | WI | Pulmonology | 4/8/2002 |
| Lucie M. Lauve, M.D. | Winston-Salem | NC | Neurology | 4/23/2001 |
| David E. Law, M.D. | Bradenton | FL | Pulmonology | 4/17/2000 |
| Kevin Frances Law, M.D. | Lawrenceville | NJ | Pulmonology | 4/8/2002 |
| Dennis P. Lawlor, M.D. | Overland Park | KS | Pulmonology | 4/11/1999 |
| Michael H. Laws, M.D. | Alton | IL | Neurology | 4/29/1991 |
| Daniel T. Layish, M.D. | Orlando | FL | Pulmonology | 4/17/2000 |
| Stephen M. Layne, M.D. | Metairie | LA | Pulmonology | 4/6/1998 |
| Fadi Layous, M.D. | Munster | IN | Internal Medicine | 3/23/2005 |
| Kenneth J. Lazarus, M.D. | Fayetteville | GA | Neurology | 4/16/2003 |
| John P. Lazenby, M.D. | Athens | GA | Pulmonology | 4/23/2001 |
| Keith J. Leavell, M.D. | St. Cloud | MN | Pulmonology | 4/6/1998 |
| Robert A. Lebby, M.D. | Los Angeles | CA | Pulmonology | 4/28/1997 |
| Alex E. Lechin, M.D. | Houston | TX | Internal Medicine | 4/17/2000 |
| Louise Younger Ledbetter, M.D. | Columbia | TN | Neurology | 3/25/2004 |
| Elliott Kyung Lee, M.D. | Gatineau | Quebec | Psychiatry | 9/21/2005 |
| Eun-Kyu Lee, M.D. | Sacramento | CA | Neurology | 4/25/1994 |
| Richard S. Lee, M.D. | Las Vegas | NV | Neurology | 4/6/1998 |
| Daniel O. Lee, M.D. | Greenville | NC | Neurology | 4/28/1997 |
| John E. Lee, M.D. | Atlanta | GA | Neurology | 4/25/1994 |
| Jung Hie Lee, M.D., Ph.D. | Medical Science | 4/29/1991 | ||
| Howard J. Lee, M.D. | Bristol | PA | Pulmonology | 4/6/1992 |
| Robert Lee, M.D. | New York | NY | Pulmonology | 9/19/2006 |
| Francis Y. Lee, M.B.,B.S. | Marietta | OH | Pulmonology | 3/25/2004 |
| Kapho Lee, M.D. | Glendale | CA | Neurology | 4/8/2002 |
| Matthias Ky-Suh Lee, M.D. | Mercer Island | WA | Psychiatry | 4/8/2002 |
| Jack C. Lee, M.D. | Fort Lee | NJ | Pulmonology | 4/8/2002 |
| Judith A. Leech, M.D. | Ottawa | ON | Pulmonology | 4/17/2003 |
| Teofilo L. Lee-Chiong Jr., M.D. | Little Rock | AR | Pulmonology | 4/11/1999 |
| William M. Leeds, D.O. | Topeka | KS | Pulmonology | 9/21/2005 |
| Norman W. Lefkovitz, M.D. | Fairlawn | OH | Neurology | 3/24/2004 |
| Michael J. Lefor, M.D. | Portland | OR | Pulmonology | 3/25/2004 |
| Paul LeGrand, M.D. | Huntsville | AL | Pulmonology | 4/18/1988 |
| Stuart G. Lehrman, M.D. | Valhalla | NY | Pulmonology | 4/23/2001 |
| Scott Michael Leibowitz, M.D. | Palo Alto | CA | Internal Medicine | 3/22/2005 |
| Helio Lemmi, M.D. | Memphis | TN | Neurology | 10/25/1979 |
| Gregory S. Lenchner, M.D. | Wynnewood | PA | Pulmonology | 4/15/2003 |
| Poh Hock Leng, M.D. | Moraga | CA | Pulmonology | 4/8/2002 |
| Attila A. Lenkey, Jr., M.D. | Wheeling | WV | Pulmonology | 4/11/1999 |
| Gary J. Leo, D.O. | Milwaukee | WI | Neurology | 4/24/1989 |
| Michael Shawn Lepire, M.D. | Phoenix | AZ | Pulmonology | 4/14/2003 |
| Andre Lerer, M.D. | West Hartford | CT | Neurology | 3/22/2005 |
| Suzanne R. Lesage, M.D. | Winston-Salem | NC | Neurology | 4/23/2001 |
| David R. Lesch, M.D. | Tucker | GA | Neurology | 4/23/1990 |
| Ronald P. Lesser, M.D. | Baltimore | MD | Neurology | 3/31/1984 |
| Mark Letica, M.D. | Charlotte | NC | Neurology | 4/24/1995 |
| Christopher John Lettieri, M.D. | Alexandria | VA | Pulmonology | 9/20/2005 |
| Man Kong Leung, M.D. | Pleasanton | CA | Neurology | 3/23/2005 |
| Felix Leung, M.D. | Salt Lake City | UT | Pulmonology | 9/19/2006 |
| Philip S. Leung, M.D. | Joliet | IL | Pulmonology | 4/23/2001 |
| William J. Leuschke, M.D. | Montgomery | AL | Neurology | 4/11/1999 |
| Bernard E. Levine, M.D. | Phoenix | AZ | Pulmonology | 4/29/1991 |
| Steven A. Levine, D.O. | Utica | NY | Pulmonology | 4/28/1997 |
| Michael H. Levine, M.D. | Indianapolis | IN | Neurology | 4/22/1996 |
| Kirk J. Levy, M.D. | Englewood | NJ | Neurology | 4/23/2001 |
| Barry E. Levy, M.D. | Park Ridge | IL | Neurology | 4/22/1996 |
| Nat Trevor Levy, M.D. | St. Louis | MO | Pulmonology | 4/14/2003 |
| Jenny Pan Lew, M.D. | Washington | DC | Pediatrics | 9/21/2005 |
| Daniel S. Lewin, Ph.D. | Washington | DC | Clinical Psychology | 3/25/2004 |
| Kevin L. Lewis, M.D. | Tulsa | OK | Pulmonology | 4/14/2003 |
| Mary-Margaret Lewis, M.D. | Washington | DC | Pulmonology | 4/14/2003 |
| David A. Lewis, M.D. | Seattle | WA | Pulmonology | 4/25/1994 |
| Vadim Leyenson, M.D. | Chicago | IL | Internal Medicine | 4/6/1998 |
| Christopher Kevin Li, M.D. | Toronto | ON | Internal Medicine | 3/25/2004 |
| Louis S. Libby, M.D. | Portland | OR | Pulmonology | 4/11/1999 |
| Cesar H. Liendo, M.D. | Shreveport | LA | Pulmonology | 4/11/1999 |
| Timothy R. Lieske, M.D. | Lincoln | NE | Pulmonology | 4/23/1990 |
| Jamie K. Lilie, Ph.D. | Chicago | IL | Psychology | 3/30/1985 |
| Melissa S. Lim, M.D. | San Francisco | CA | Pulmonology | 4/14/2003 |
| Li-Ling Lim, M.B.,B.S. | Singapore | Neurology | 3/25/2004 | |
| John Douglas Liming, M.D. | Cincinnati | OH | Pulmonology | 3/23/2005 |
| George Szu-Wei Lin, M.D. | Township of Washington | NJ | Pulmonology | 3/25/2004 |
| Frank P. Lin, M.D. | Arcadia | CA | Neurology | 9/19/2006 |
| Siong-chi Lin, M.D. | Rochester | MN | Psychiatry | 4/24/1989 |
| Scott S. Lindblom, M.D. | Charlotte | NC | Pulmonology | 4/28/1997 |
| Howard E. Linder, M.D. | Gallipolis | OH | Pulmonology | 4/23/2001 |
| Mark E. Lindsay, M.D. | Eau Claire | WI | Pulmonology | 4/23/2001 |
| J. Gila Lindsley, Ph.D. | Lexington | MA | Psychology | 3/31/1984 |
| Nancy I. Linneman, M.D. | Goshen | NY | Pulmonology | 4/16/2003 |
| Eric J. Lipson, M.D. | Lakeland | FL | Pulmonology | 4/24/1995 |
| Jonathan L. Liss, M.D. | Columbus | GA | Neurology | 4/23/2001 |
| Blake A. Little, M.D. | Joplin | MO | Pulmonology | 4/6/1998 |
| Ernest A. Little, M.D. | Albany | GA | Neurology | 4/17/2000 |
| Michael R. Littner, M.D. | Sepulveda | CA | Pulmonology | 4/19/1993 |
| Lynn C. Liu, M.D. | Rochester | NY | Neurology | 4/23/2001 |
| Roger T. Liu, M.D. | West Des Moines | IA | Pulmonology | 4/17/2000 |
| Audrey Han-yi Liu, M.D., C.M. | Baltimore | MD | Internal Medicine | 3/23/2005 |
| Douglas S. Livornese, M.D. | Long Branch | NJ | Pulmonology | 4/11/1999 |
| Carlos M. Llanes, M.D. | Laredo | TX | Pulmonology | 4/8/2002 |
| Kar-Ming Lo, M.D. | Centennial | OH | Pulmonology | 4/17/2003 |
| Thomas J. Lo Russo, M.D. | Fairfax | VA | Pulmonology | 4/25/1994 |
| Derek H. Loewy, Ph.D. | Tucson | AZ | Psychology | 4/11/1999 |
| Raymond J. Loffer, M.D. | Indianapolis | IN | Neurology | 4/6/1992 |
| James P. Loftin, M.D. | Dallas | TX | Pulmonology | 4/24/1989 |
| Drew Henderson Logue, M.D. | Modesto | CA | Pulmonology | 9/21/2005 |
| Gerard T. Lombardo, M.D. | Brooklyn | NY | Pulmonology | 4/6/1998 |
| Paxton J. Longwell, M.D. | Corpus Christi | TX | Neurology | 4/28/1997 |
| Daniel George Lorch, M.D. | Brandon | FL | Pulmonology | 4/8/2002 |
| Jose S. Loredo, M.D. | San Diego | CA | Pulmonology | 4/17/2000 |
| Dalia Lorenzo, M.D. | Miami | FL | Neurology | 9/19/2006 |
| Daniel I. Loube, M.D. | Seattle | WA | Pulmonology | 4/22/1996 |
| M. Barrett Louden, Jr., M.D. | Parkersburg | WV | Neurology | 4/24/1995 |
| Gary Keith Lovelady, M.D. | Manchester | TN | Pulmonology | 3/25/2004 |
| Stephen R. LoVerme, M.D. | Beverly | MA | Neurology | 4/22/1996 |
| Daniel D. Lowery, M.D. | Georgetown | TX | Pulmonology | 4/8/2002 |
| Timothy Alan Lucas, M.D. | Hollidaysburg | PA | Pulmonology | 4/14/2003 |
| Edgar A. Lucas, Ph.D. | Fort Worth | TX | PhD Anatomy | 10/3/1980 |
| William Lucht, M.D. | Anchorage | AK | Pulmonology | 4/14/2003 |
| Michael A. Lucia, M.D. | Reno | NV | Pulmonology | 4/17/2000 |
| James A. Lucio, M.D. | Plantation | FL | Pulmonology | 4/8/2002 |
| James Joseph Ludwick, M.D. | Houston | TX | Otolaryngology | 9/19/2006 |
| Naeem A. Lughmani, M.D. | Toledo | OH | Pulmonology | 4/11/1999 |
| Esther Hai-Min Lum, M.D. | Honolulu | HI | Pulmonology | 3/25/2004 |
| Stephen A. Lund, M.D. | New York | NY | Psychiatry | 4/22/1996 |
| Matthew Carl Lundien, M.D. | Brandon | SD | Pediatric Pulmonology | 3/25/2004 |
| J. Scott Luther, M.D. | San Antonio | TX | Neurology | 4/23/1990 |
| Dmitry Lvovsky, M.D. | Brooklyn | NY | Internal Medicine | 9/20/2005 |
| Jennifer Kathryn Lynch, M.D. | Springfield | MO | Neurology | 3/23/2005 |
| Philip J. Lyng, M.D. | Scottsdale | AZ | Pulmonology | 4/23/2001 |
| George R. Lyons, M.D. | Boise | ID | Clinical Neurophysiology | 4/15/2003 |
