No. You do not have to contact anyone.
Attached are the instructions for Schedule C. Beginning on page C17 are the codes for various activities. Just use the appropriate code when completing your Schedule C.
https://www.irs.gov/pub/irs-pdf/i1040sc.pdf
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
