http://www.netflix.com/browse/genre/INSERTNUMBER

ACTION & ADVENTURE

1365 = Action & Adventure

77232 = Asian Action Movies

46576 = Classic Action & Adventure

43040 = Action Comedies

43048 = Action Thrillers

8985 = Martial Arts Movies

2125 = Military Action & Adventure

7442 = Adventures

10118 = Comic Book and Superhero Movies

7700 = Westerns

10702 = Spy Action & Adventure

9584 = Crime Action & Adventure

11828 = Foreign Action & Adventure

COMEDY

6548 = Comedies

869 = Dark Comedies

4426 = Foreign Comedies

1402 = Late Night Comedies

26 = Mockumentaries

2700 = Political Comedies

9702 = Screwball Comedies

5286 = Sports Comedies

11559 = Stand-up Comedy

3519 = Teen Comedies

4922 = Satires

5475 = Romantic Comedies

10256 = Slapstick Comedies

CULT

7627 = Cult Movies

8195 = B-Horror Movies

1252 = Campy Movies

10944 = Cult Horror Movies

4734 = Cult Sci-Fi & Fantasy

9434 = Cult Comedies

4195 = Independent Comedies

DOCUMENTARY

6839 = Documentaries

3652 = Biographical Documentaries

9875 = Crime Documentaries

5161 = Foreign Documentaries

5349 = Historical Documentaries

4006 = Military Documentaries

180 = Sports Documentaries

90361 = Music & Concert Documentaries

1159 = Travel & Adventure Documentaries

7018 = Political Documentaries

10005 = Religious Documentaries

2595 = Science & Nature Documentaries

3675 = Social & Cultural Documentaries

Complete list: NetflixCodes.txt

Source: http://ogres-crypt.com/public/NetFlix-Streaming-Genres2.html