CPT® Code 83789

Mass spectrometry and tandem mass spectrometry (eg, MS, MS/MS, MALDI, MS-TOF, QTOF), non-drug analyte(s) not elsewhere specified, qualitative or quantitative, each specimen

Mass spectrometry (MS) and tandem mass spectrometry (MS/MS) are sophisticated analytical techniques utilized for the detection and analysis of molecules by electronically measuring their weight. The results of these measurements are presented in the form of a mass spectrum graph, which illustrates both the presence of various molecules (qualitative results) and the specific quantities of each molecule (quantitative results) within a given sample. The samples analyzed can be in various states, including liquid, solid, or gas. The process may involve a single-step phase (MS) or a more complex multi-step process where fragmentation occurs between stages (MS/MS). One specific method, matrix-assisted laser desorption/ionization (MALDI), is particularly useful for mass spectrometry imaging of thin tissue samples. In this technique, the sample is either embedded in or mixed with a matrix material that absorbs the laser's irradiation wavelength, facilitating the ionization of the analyte for subsequent mass spectrum recording. Another method, mass spectrometry time-of-flight (MS-TOF), accelerates ions through an electric field of a predetermined strength, ensuring that all ions with the same charge possess identical kinetic energy. The velocity of these ions is contingent upon their mass-to-charge ratio, which is determined by measuring the time it takes for the ion particles to reach a detector positioned at a known distance under specific experimental conditions. These mass spectrometry techniques find applications across various fields, including biochemistry for measuring proteins, peptides, sugars, and oligonucleotides, as well as in the pharmaceutical industry for drug discovery, combinatorial chemistry, pharmacokinetics, and drug metabolism. In clinical medicine, they are employed for newborn screening and drug testing. The CPT® Code 83789 is designated for reporting qualitative or quantitative testing of non-drug analytes that are not specified elsewhere.