Billing Schedule 2009 Client Services Billing Schedule Billing Month Friday - Cutoff Date December 2008 November 14, 2008 January 2009 December 12, 2009 February 2009 January 16, 2009 March 2009 February 13, 2009 April 2009 March 13, 2009 May 2009 April 10, 2009 June 2009 May 15, 2009 July 2009 June 12, 2009 August 2009 July 10, 2009 September 2009 August 14, 2009 October 2009 September 11, 2009 November 2009 October 16, 2009 December 2009 November 13, 2009 January 2010 December 11, 2009  Billing Schedule PDF Contact Client Services: For questions or inquiries about your billing invoice or payment status: Local: (405) 607-4777 Toll Free: 1-866-503-4294 Fax Enrollments/Changes: (405) 607-2136 Email: clientservices@deltadentalok.org Online Billing/Payment Link: https://www.deltadentalok.org/OnlineResources Pay-by-Phone: 1-877-729-7343 Enroll with E-Bill Our "E-Bill" system lets us provide you (or a designated person within your company) with a link every month that will notify you when your monthly billing invoice is ready to be retrieved. You receive this link on your usual billing day each month. Then, you simply visit our website, enter your User Name and Password (which will be provided by Delta Dental) and retrieve your bill.  View Application Form