Hand surgery billing involves the billing and coding process for medical services related to the diagnosis and treatment of hand and upper extremity conditions and injuries. It includes capturing patient information, assigning accurate medical codes specific to hand surgery procedures and treatments, and submitting claims to insurance companies for reimbursement. Hand surgery billing requires expertise in coding guidelines for hand and upper extremity diagnoses and procedures, understanding of insurance policies, and compliance with regulatory requirements to ensure proper reimbursement and optimize revenue in hand surgery practices.