Effective for dates of service on or after May 1, 2010, CPT code 84146 (prolactin level testing) is reimbursable when billed in conjunction with one of the following updated ICD-9-CM diagnosis codes: 242.90, 242.91, 250.40 – 250.43, 403.00 – 403.91, 404.00 – 404.93, 405.01 – 405.99 and 676.00 – 676.94.