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CVS is usually performed between 10 and 13 weeks from your last menstrual period. CVS may be chosen over amniocentesis because it may be performed earlier in the pregnancy. Chorionic villus sampling detects chromosome abnormalities (i.e. Down syndrome) and genetic disorders (i.e. cystic fibrosis.).
When multiple procedures are done at the same visit, you should report the primary procedure as listed in CPT. This is typically considered to be the procedure with the most relative value units (RVUs) in the Medicare fee schedule.