Why do clinicians have to include diagnosis codes (in addition to procedure codes) when submitting claims for medical services to CMS?

A. The IRS cross-checks diagnoses against patient income tax deductions for medical care.
B. CMS will not pay for procedures that don't relate to the diagnosis.
C. Diagnosis-related data is transmitted to the Centers for Disease Control and Prevention so it can detect trends.
D. CMS uses diagnosis and procedure codes to assess the competence of clinicians.

Answer: B