CDC Study Guide 2026
Everything you need to pass the CDC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CDC Exam Format at a Glance
📚 CDC Topics to Study (65)
✍️ Sample CDC Questions & Answers
1. Which CDT code is used for cone beam CT of one jaw?
D0364 represents cone beam CT image — craniofacial data capture, one jaw, in the CDT code set.
2. Under HIPAA, the standard electronic transaction code set for dental claims is:
The X12 837D (Dental) transaction set is the HIPAA-mandated standard for electronic dental claim submissions.
3. A patient reports taking St. John's Wort (hypericum). Which dental drug class may have REDUCED efficacy due to this herbal supplement?
St. John's Wort induces CYP3A4 and P-glycoprotein, accelerating the metabolism of benzodiazepines and reducing their sedative effect.
4. Under the ADA Code of Professional Conduct, which principle requires a dentist to act in the patient's best interest even when it may not benefit the dentist financially?
Beneficence requires dental professionals to promote the patient's welfare above their own financial interests.
5. A patient presents with trismus, swelling, and a fever of 102°F. The dental consultant should recognize this as:
Trismus with swelling and fever are hallmarks of a spreading odontogenic space infection, which may require hospitalization.
6. When a dental coder must report a procedure not adequately described by any existing CDT code for a periodontal service, which code is used?
D4999 is the unspecified periodontal procedure code used when no existing CDT code accurately describes the service rendered, and it typically requires a written narrative.