Here is a short version....the website that N2MDK provided in his post is much more detailed than here...check it out, LOTS of good info on there for your area.
Suffolk County:
File 1 - Stolen vehicle
Code 1 - Stolen vehicle
Code 2 - Auto used in a crime
Code 3 - Set up roadblocks
Code 4 - Wanted for hit and run
Code 5 - Wanted or escaped person
Code 6 - Missing/runaway person
Code 7 - Wanted for burglary
Code 8 - Wanted fro robbery
Code 9 - Lost property
Code 10 - Stolen property
Code 11 - Wanted for assault
Code 12 - Wanted for homicide
Code 13 - Wanted for kidnapping
Code 16 - Lost/stolen plates
10-1 Officer needs help
10-2 Larceny
10-3 Burglary
10-4 Acknowledge
10-5 Homicide
10-6 Kidnapping
10-7 Criminal mischief
10-8 Sick/injured
10-9 Inhalator
10-10 Auto accident
10-11 Call HQ
10-12 Return to command
10-13 Call command
10-18 Meal
10-14 Stolen car
10-15 Robbery/holdup
10-16 Fight
10-17 Disturbance
10-19 Gone on arrival
10-20 Drunk driver
10-21 Hit and run
10-22 Unruly group
10-23 Request detective
10-24 Fire
10-25 Prowler
10-26 Escort
10-27 In service
10-28 Out of service
10-29 Verify registration
10-30 Missing person
10-31 Lost child
10-32 Prisoner transport
10-33 Switch to ch B
10-34 Suspicious person
10-35 State location
10-36 Arrived on scene
10-38 Completed
10-39 Any messages?
10-40 Prisoner food
10-41 Bank robbery
10-43 Bomb scare
10-45 Relieve unit
10-45A Listing requested
10-47 Dangerous/armed
10-50 On call from home
10-51 Registration check
10-55 Switch to ch C
10-65 Identify unit
10-66 Vehicle service
HERE is some more info on suffolk county...compliments of the rrdb...also where I got the above info.