What is delta dental customer service phone number? The mobile customer service number of Delta Dental are 1-800-323-1743. Address detail : 111, Shuman Boulevard, Naperville, U.S.What is the toll free number for delta dental? Delta Dental Insurance California toll free customer service phone number : 1 916-861-2409. Delta Dental of Oregon toll free customer service phone number : 630-574-6001. Delta Dental is a insurance company is a group of companies, it gives largest dental care and benefits as well as insurance facilities.How to contact delta dental of new york? Delta Dental of New York, Inc. P.O. Box 2105 Mechanicsburg, PA 17055-2105 (717) 766-8500 (800) 932-0783 TTY/TDD 888-373-3582 www.deltadentalins.com DENTIST I.D.NUMBER (NPI) MO. DAY YR. MIDDLE INITIAL 13.SPOUSE BIRTHDATE MO. DAY YR. 11.DELTA - COVERED EMPLOYEE BIRTHDATE MO. DAY YR. 15.SPOUSE I.D.NUMBER