Medical billing coding, particularly using the International Classification of Diseases (ICD) system, is a vital component of the healthcare industry, ensuring accurate documentation and reimbursement for medical services. ICD codes provide a standardized way to classify diagnoses, symptoms, and procedures, facilitating communication between healthcare providers, insurers, and government agencies.

These codes are essential for proper billing, allowing healthcare providers to accurately describe the services rendered and enabling insurance companies to process claims efficiently. With regular updates and revisions to accommodate advancements in medical knowledge and technology, the ICD system plays a crucial role in maintaining the integrity and efficiency of healthcare billing processes worldwide.

There are currently five major medical coding classification systems that are used to identify and manage medical codes — ICD-11, ICD-10-CM, ICD-10-PCS, CPT and HCPCS Level II.