honda code

does anyone know how I can get the code to my Honda Civic Radio. I changed my battery and It just says code. Honda wants to charge me.

Please help.
Model # 39100-s02-A000
Ref # CQ-JH581OZ
serial # M98D101728

did honda also make the radio or is it made by another company?

its eay same thing happend to me when i got my car back from my accindent.. go up to a honda dealership and ask them for the code.if you allready tied putting in anyother code you gotta restart your battery agian then put the code in.