Under California Penal Code Section 288.4, it is illegal to arrange a meeting with a minor or a person you believe to be under the age of 18 for the purpose of lewd and lascivious sexual conduct.
This includes using means such as online chat rooms, Facebook, Twitter and Instagram to contact the minor.
When he was taken to the adult service, he redialled, but soon realised the number was wrong, the US network reported.
The incident came a day before US President Barack Obama hailed his healthcare legislation, nicknamed Obamacare, a success after 7.1 million people had signed up for the coverage.
Users of the Covered California website, attempting to sign up to the scheme before the 31 March deadline, were given the option of calculating the cost of health coverage, including a line for those with hearing impairments.
But the number listed was wrong by one digit, reported, and did not connect to the insurance company.“Welcome to America’s hottest talk line.
Ladies, to talk to interesting and exciting guys free, press one now. Press two to connect free now,” the recording on the adult chat service said.
One resident said he logged on to Covered California's website, and having filled in his information, was prompted to call the company's helpline.