Here are a few key links from this section:

Mt. Sinai Adolescent Health Center (Ages 10-21)
http://www.mountsinai.org/Patient%20Care/Service%20Areas/
Adolescent%20Health

Ryan Center Mobile Clinic for Youth (Ages 13-24) www.ryancenter.org/services/hiv/shout.html

NYC Dept. of Health and Mental Hygiene
 http://www.nyc.gov/html/doh/html/home/home.shtml