It appears that, in general, you have three years from the date of the injury in Arizona. However, many circumstances may alter this limitation period is is recommended that you act fast and consult a local attorney if you believe you have a medical malpractice case. For example, you may have a longer period of time or the time may not start running until you found out about the injury. This all needs to be evaluated on a case-by-case basis. Medical malpractice cases are extremely complicated and require the hiring of expert witnesses. State laws put lots of restraints on bringing suits against health-care providers so it is recommended that you consult a local Arizona attorney to better advise you of the state laws. A local attorney can also evaluate your potential case and determine the statue of limitations. I hope this helps. Good luck!
NOTE: This response is general in nature and should not be considered legal advice. No attorney-client relationship exists or is formed by this information.