We extracted information from a Japanese claims info provided by Medical information Vision (MDV info, April 2008–March 2019) containing information from around 28 million patients from 385 acute-care hospitals. Patients with IPF (those diagnosed with IPF a minimum of once) from April 2017 to March 2018 were known within the MDV information [1]. The quantity of patients within the MDV information was cypher nationwide victimization the fourth NDB Open information (April 2017–March 2018), and also the prevalence was calculable victimization demographic information as denominators. The prevalence within the United States of America, considering an equivalent definition of IPF, was conjointly calculated and compared with that in Japan.