So I am a therapists doing home health which does not require NPI number so far. I worked at a physical therapy clinic 2 years ago for about 2 months and then left to pursue home health full time. anyway, I just found out that the clinic still using my NPI, name and license to file claims with Medicare and private insurance. my questions are: Is ther a way to find the claims filed under my NPI for the past 2 year? can I deactivate my NPI? can I obtain a new NPI?