Nasal Valve Anatomy: Internal vs. External Valve January 8, 2015 Dean Toriumi, MD discusses the difference between internal valve versus external valve collapse and the surgical options available for each. Related videos Webinar: Reimbursement landscape for LATERA, ClariFix and BDETWatch our didactic lecture discussing reimbursement including: Webinar: LATERA and CPT code 30468Tricia Long, COPM Past president, ASCENT Video tags NAO LATERA nasal implant Nasal implant Nasal valve collapse