CPT modifier used for the professional component. Certain procedures are a combination of a professional physician component and a technical component. When the professional (physician) component is reported separately, the service may be identified by adding the modifier -26 to the usual procedure number. Use of this modifier may affect reimbursement. The professional component comprises only the professional services performed by the physician during radiologic, laboratory, and other diagnostic procedures. These services include a portion of a test or procedure that the physician does such as interpretation of the results. The technical component includes personnel; materials including usual contrast media and drugs, film, or xerograph; space; equipment; and other facilities but excludes the cost of radioisotopes. When billing for the technical component, use the usual five-digit procedure number with modifier -TC.