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Our counts agree with yours when the codes for Loinc parts are not included in the data set; we do include them and saw the large drop between 2.42 and 2.46. I don’t know if this reflects a cleanup of the Regenstrief data, or a change in the UMLS files from which we derived the codes or some other issue.
I appreciate the reassurance that we aren’t missing any of the key LOINC codes.