Internal medicine billing must also account for routine preventive care, annual wellness visits, and coordination of care with other specialists, which adds layers of complexity to coding and reimbursement. Billers must navigate the specific rules and fee schedules of various payers, including Medicare, Medicaid, and commercial insurance, while ensuring compliance with regulations such as Medicare’s chronic care management (CCM) and transitional care management (TCM) programs. Denial management, appeals processing, and accurate documentation are essential in ensuring timely payments and minimizing revenue loss. Effective internal medicine billing helps practices maintain financial stability while delivering comprehensive care to patients with diverse and often complex healthcare needs.