At our department, we have all WIC participants sign our regular PH office consent form on each visit. The signed consent includes: Consent to Treat statement, Release of Information for Billing, and Payment Assignment. We also then make a charting note in our PH software that states why the patient was seen (very generic reasons (ex: wic cert, wic re-cert, finger stick, etc.)), by whom and date/time.
We have never had an audit on it though.