EXHIBIT 3.1 CERTIFICATE OF FORMATION OF IASIS HEALTHCARE LLC 1. The name of the limited liability company is IASIS Healthcare LLC. 2. The address of its registered office in the State of Delaware is 1209 Orange Street, in the City of Wilmington, Country of New Caste. The name of its registered agent at such address is The Corporation Trust Company. IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation of on this 11th day of May, 2004. IASIS HEALTHCARE LLC By: /s/ Karen H. Abbott ------------------------ Name: Karen H. Abbott Title: Authorized Person State of Delaware Secretary of State Division of Corporations Delivered 05:42 PM 05/11/2004 FILED 05:42 PM 05/11/2004 SRV 040344210 - 3801993 FILE