Which statement about ICD-10 codes is true?

• A. They categorize diseases
• B. They list lab tests
• C. They are used for dosing
• D. They identify insurance eligibility

Answer: (A)

ICD-10 codes provide a standardized way to categorize diseases and other health problems so they can be recorded consistently across clinicians, settings, and over time. This coding supports diagnosing, epidemiology, and especially billing and statistical tracking, since each condition has a unique code.

Lab tests are not encoded with ICD-10; they use CPT and often LOINC codes. Dosing information isn’t captured by ICD-10 either—medications are encoded differently, such as with NDC or pharmacy codes. Insurance eligibility is determined by payer processes and coverage rules, not by ICD-10 alone, though the codes can influence claims processing.