Asian American men cast as doctors in TV medical shows: only four in 50+ years:
“Dr. Ken”: Ken Jeong as Dr. Ken Park.  Thank you ABC.
“Three Rivers”: Daniel Henney as Dr. David Lee;
“House, M.D.”: Kai Penn as Dr. Lawrence Kutner; Kenneth Choi as obstetrician in first season, episode “Maternity” which aired December 7, 2004, and anonymous Asian American men who appeared on the hospital’s board of directors and disciplinary
board.
If you know of any more, please let me know.

”General Hospital” (ABC) 1963 –

“E.R.” (1994 –    ) (info current as of Jan. 2006)
(had an episode in which Asian American man beat his wife)
Producers:
Penny Adams, Neal Baer, Tommy Burns, Yahlin Chang, Christopher Chulack, Samantha Howard Corbin, Michael Crichton, Carol Flint, R. Scott Gemmill, Lance Gentile, Walon Green, Patrick Harbinson, Julie Hébert, Michael Hissrich, Dee Johnson, Jonathan Kaplan, Mimi Leder, Paul Manning, Bruce Miller, David Mills, Chris Misiano, Robert Nathan, Jack Orman, Tom Park, Joe Sachs, Mike Salamunovich, Teresa Salamunovich, Janine Sherman, Wendy Spence, Steven Spielberg, Meredith Stiehm, Richard Thorpe, Vicki Voltarel, John Wells, Virgil Williams, Lydia Woodward, David Zabel, Lisa Zwerling
Directors
39 episodes: Jonathan Kaplan
34 episodes: Christopher Chulack
25 episodes: Richard Thorpe
11 episodes: Felix Enriquez Alcala
10 episodes: Mimi Leder, Chris Misiano
9 episodes: Lesli Linka Glatter
8 episodes: Laura Innes
6 episodes: Charkes Haid, John Wells
5 episodes: Rod Holcomb, Paul McCrane, David Nutter
4 episodes: Anthony Edwards, Julie Hebert, Nelson McCormick
3 episodes: Paris Barclay, Alan J. Levi, Jack Orman, Thomas Schlamme, Babu Subramaniam
2 episodes: Arthur Albert, Stephen Cragg, Vondie Curtis-Hall, Steve De Jarnatt, Donna Deitch, Ernest R. Dickerson, Lance Gentile, Fred Gerber, Marita Grabiak, James Hayman, Elodie Keene, Ken Kwapis, Darnell Martin, Tom Moore, Gloria Muzio, Peggy Rajski, Jacque E. Toberen
1 episode: Anita W. Addison, Sarah Pia Anderson, Guy Norman Bee, David Chameidies, Fred Einesman, Brett Fallis, Vern Gillum, Davis Guggenheim, Kevin Hooks, Michael Katleman, Barnet Kellman, Eric Laneuville, Perry Lang, Peter Markle, Tawnia McKiernan, Dean Parisot, Whitney Ransick, Daniel Sackheim, Quentin Tarantino, Mark Tinker, Jesus Trevino, Jessica Yu
Writers:
20+ episodes: John Wells, Jack Orman, Lydia Woodward, R. Scott Gemmill
10+ episodes: David Zabel, Joe Sachs, Dee Johnson, Neal Baer, Carol Flint, Paul Manning
5+ episodes: Samantha Howard Corbin, Lisa Zwerling, Lance Gentile, Meredith Stiehm, Walon Green
1+ episodes: David Mills, Yahlin Chang, Julie Hébert, Bruce Miller, Robert Nathan, Linda Gase, Elizabeth Hunter, Jason Cahill, Patrick Harbinson, Tom Garrigus, Michael Crichton, Tracey Stern, Jacy Young
1 episode: Barbara Hall, Anne Kenney, Sandy Kroopf, Christopher Mack, Mark Morocco, Doug Palau, Janine Sherman, Virgil Williams
1 story: Belinda Casas-Wells, Moreen Littrell

“Medical Center” (CBS) 1969 -1976

”Marcus Welby, M.D.” (ABC) 1969 – 1976

“Scrubs”  (NBC)   2001 –

“House, M.D.” (Fox)  2004 –  (info current as of Jan. 2006)
Creator, executive producer, writer: David Shore
Executive producers: Paul Attanasio, Katie Jacobs, Bryan Singer, John Mankiewicz
Producer: Gerrit van der Meer
Supervising producer: Thomas L. Moran, Matt Witten
Consulting producers: Peter Blake, Sara B. Cooper
Directors: Daniel Attias, Paris Barclay, Guy Ferland, Fred Gerber, Keith Gordon, Tim Hunter, Bill Johnson, Frederick King Keller, Nelson McCormick, Peter Medak, Gloria Muzio, Peter O’Fallon, Daniel Sackheim, Deran Sarafian, Newton Thomas Sigel, Bryan Singer, Bryan Spicer, Greg Yaitanes, Randall Zisk
Writers: Peter Blake, Sara B. Cooper, David Foster, Liz Friedman, Russel Friend, Sara Hess, Lawrence Kaplow, Garrett Lerner, John Mankiewicz, Thomas L. Moran, John Anderson Thompson, Matt Witten

??  Had two episodes with Asian American men as physicians and one had a speaking part!  Did have an episode in which Asian American man was mean to his wife
“Grey’s Anatomy” (set in Seattle) (ABC)  2005 – present
Creator, Executive Producer, writer: Shonda Rhimes
Executive producers: Betsy Beers, Mark Gordon, Peter Horton, Jim Parriott
Directors: Peter Horton, John David Coles, Adam Davidson, Mark Tinker, Wendy Stanzler
Writers: Zoanne Clack, M.D.,Ann Hamilton, Kip Koenig, Stacy McKee, James D. Parriott, Mimi Schmir, Gabrielle G. Stanton, Krista Vernoff, Harry Werksman,
Mark Wilding

”Strong Medicine” (Lifetime TV) 2000 –

”Nip/Tuck” (F/X) 2003 –