CDC CPT, ICD-10, & CDT Coding Systems 2 — Questions and Answers
Question 1: Which CDT code category covers orthodontic services?
- D8000–D8999 (Correct answer)
- D7000–D7999
- D6000–D6999
- D9000–D9999
Correct answer: D8000–D8999
CDT codes in the D8000–D8999 range are designated for orthodontic services.
Question 2: What does the 'Z' prefix in an ICD-10-CM code indicate?
- Factors influencing health status and contact with health services (Correct answer)
- Injury and poisoning
- Mental and behavioral disorders
- Infectious and parasitic diseases
Correct answer: Factors influencing health status and contact with health services
ICD-10-CM Z codes represent factors influencing health status and contact with health services, such as dental examinations.
Question 3: A dental patient receives a comprehensive periodontal evaluation. Which CDT code range applies?
- D0100–D0999 (Correct answer)
- D4000–D4999
- D1000–D1999
- D2000–D2999
Correct answer: D0100–D0999
Comprehensive periodontal evaluations are diagnostic services coded in the D0100–D0999 (Diagnostic) category.
Question 4: CPT code 41899 is an example of what type of code?
- Unlisted procedure code (Correct answer)
- Category II code
- Category III code
- Add-on code
Correct answer: Unlisted procedure code
CPT codes ending in '99' within a section are unlisted procedure codes used when no specific code exists for the service.
Question 5: ICD-10-CM code K08.409 describes which dental condition?
- Partial loss of teeth, unspecified cause, unspecified class (Correct answer)
- Complete loss of teeth due to trauma
- Periodontal disease, unspecified
- Dental caries involving enamel
Correct answer: Partial loss of teeth, unspecified cause, unspecified class
K08.409 represents partial loss of teeth due to unspecified cause, unspecified class of edentulism.
Question 6: Which organization publishes and maintains the CDT code set?
- American Dental Association (ADA) (Correct answer)
- American Medical Association (AMA)
- Centers for Medicare & Medicaid Services (CMS)
- World Health Organization (WHO)
Correct answer: American Dental Association (ADA)
The American Dental Association (ADA) is the copyright holder and publisher of the CDT code set, updated annually.
Question 7: A patient undergoes removal of an impacted tooth requiring cutting of bone. Which CDT code range is most appropriate?
- D7000–D7999 (Correct answer)
- D8000–D8999
- D6000–D6999
- D5000–D5999
Correct answer: D7000–D7999
Surgical extractions and impacted tooth removals are coded in the D7000–D7999 Oral and Maxillofacial Surgery category.
CDC CPT, ICD-10, & CDT Coding Systems 2
Which CDT code category covers orthodontic services?