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HCPCS includes three levels of codes: Level I consists of the American Medical Association's Current Procedural Terminology (CPT) and is numeric.; Level II codes are alphanumeric and primarily include non-physician services such as ambulance services and prosthetic devices, and represent items and supplies and non-physician services, not covered by CPT-4 codes (Level I).
Flame rectification is a phenomenon in which a flame can act as an electrical rectifier.The effect is commonly described as being caused by the greater mobility of electrons relative to that of positive ions within the flame, [1] and the asymmetric nature of the electrodes used to detect the phenomenon.