What icd-9 code should be used for cpt code 84403?

CPT code 84403 corresponds to the laboratory test for thyroid-stimulating hormone (TSH). The appropriate ICD-9 code to use would depend on the specific reason for the test, but common codes include 243.9 for hypothyroidism or 244.9 for hyperthyroidism. It's essential to select the ICD-9 code that accurately reflects the patient's diagnosis related to the TSH testing. Always check the latest coding guidelines to ensure proper coding.