ICD9 Procedure Code Mapping Data for use with Stata, History 2. V16 3. Dataset obtained 24aug1999 from http://www.hcfa.gov/stats/pufiles.htm, file http://www.hcfa.gov/stats/icd9v16.exe 4. V18 5. Dataset obtained 10may2001 from http://www.hcfa.gov/stats/pufiles.htm, file http:...