Pediatric & Adolescent Center 424 Mulberry Street Milton, DE 19968. Phone: (302) 684-0561 Fax: (302) 684-0604. Extensions: Nurse - 201 Referral - 104 Billing - 401. Home; About Us. ... Patient Portal; Pay Online; Patient Portal Registration. Access our Patient Portal HERE to access Immunizations and other Medical Records. You can also contact a ....