OBJECTIVES: Other Interstitial pulmonary diseases with fibrosis (OIPDF) classified by ICD-10 CA code J84.1 are rare with unknown prevalence at the national level in Canada. OIPDF includes diffuse pulmonary fibrosis, fibrosing alveolitis (cryptogenic), Hamman-Rich syndrome, idiopathic pulmonary fibrosis, and usual interstitial pneumonia.   To estimate the prevalence and incidence of OIPDF in Canada in 2010. METHODS: We used mandatory standardized national administrative data from fiscal years 2006 to 2011 to identify OIPDF cases aged 50+ with an ICD-10 CA diagnosis code of J84.1 from acute care admissions, emergency room visits, day surgery and in-hospital respiratory clinics. Cases were required to have computed tomography, biopsy or bronchoscopy prior to the OIPDF diagnosis and were excluded if they had a subsequent diagnosis of other interstitial lung disease after the OIPDF diagnosis. We compared the rates of prevalence to incidence and investigated the rates of death with Kaplan Meier analysis.  National estimates for rates of prevalence and risk of death were compared for OIPDF versus COPD.    RESULTS: In Canada for the year 2010 for ages 50+, the prevalence of OIPDF was 6,307 (54.1/100,000) and incidence was 2,804 cases (24.0/100,000). The low ratio of prevalence to incidence (2.2) existed because of a high death rate, with the 4 year cumulative risk of death being 46.8%. The number of deaths for OIPDF was 28.9% of all deaths from COPD, while the prevalence of OIPDF was 2.9% of all COPD cases. CONCLUSIONS: OIPDF is an important disease with a high death rate and non-trivial prevalence and incidence rates.  However, there were wide variations in the rates of prevalence and incidence across the provinces, and the national estimates were higher than reported from other countries. Further research at the provincial level is forthcoming to validate the national estimates.