As a medical billing and coding specialist, your job is to review treatments and procedures given to patients and select codes to send to insurance companies and other payers. In this role, you may also examine medical records, audit work by other coders, obtain referrals and pre-authorizations, check patient bills for accuracy and completeness, and follow up on any unpaid claims. Medical billing and coding specialists sometimes talk with healthcare providers to gather more information, use electronic billing software, research denied claims, answer questions from patients or insurance companies, and otherwise help process financial transactions as necessary. Employers may occasionally ask you to perform other duties as needed.