Current Dental Terminology, it is the official coding used by dentist. Few CDT 2013 codes as follows D0100 D0999 I. Diagnostic Clinical Oral Evaluations D0120 periodic oral evaluation established patient D0140 limited oral evaluation problem focused D0145oral evaluation for a patient under three years of age and counseling with primary caregiver D0150comprehensive oral evaluation new or established patient D0160 detailed and extensive oral evaluation problem focused, by report D0170 Re-evaluation limited, problem focused (established patient; not postoperative visit) D0180comprehensive periodontal evaluation new or established patient Pre diagnostic Services D0190screening of a patient D0191assessment of a patient