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A physician prescribes carbamazepine to treat a patient with epileptic seizures.

A physician prescribes carbamazepine to treat a patient with epileptic seizures. After six months, the physician performs a therapeutic drug test to monitor the total level of the drug in the patient.

What CPT® and ICD-10-CM coding is used for the six month-evaluation?

A.

80156, R56.9

B.

80157, R56.9

C.

80157, G40.909

D.

80156, G40.909

AAPC CPC Summary

  • Vendor: AAPC
  • Product: CPC
  • Update on: Feb 7, 2026
  • Questions: 354
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