The most comparable code (based on your description) would be CPT code 42330 for sialolithotomy; submandibular, uncomplicated, intraoral (a simple procedure). As usual, check payer guidelines. I know Aetna has a policy regarding sialendoscopy for salivary stone removal.
Hope that helps.
Sincerely,
Jennifer M. Connell, CPC, CPCO, CPC-P, CPB, CPMA, CPPM, CPC-I, CENTC