I just dropped off my renewal for Wake County this morning. The packet includes a NC Courts form
AOC-SP-914M titled "RELEASE OF PHYSICAL AND MENTAL HEALTH, SUBSTANCE ABUSE AND CONFIDENTIAL COURT RECORDS FOR CONCEALED HANDGUN PERMIT". It was pre-filled to request records from Alliance Behavioral Healthcare in Durham, Central Regional Hospital in Butner, and Wake County Human Services. Since this is a state form, it probably is the same for all counties.
Note that the fine print above the signature block states that "Any expenses relating to the search, production, copying and
certification of a medical or court record pursuant to this Release
shall be my responsibility."
I don't recall if this form or something similar was in my original application or previous renewals, but I'm pretty sure I didn't pay anything other than the standard permit fee to the Sheriff's office.