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you can see any doctor within the medical provider network at any time.
ask your doctor for a referral.
ask your adjuster for a list of orthos in your area.
many carriers have their MPN list on line
detailed information on california comp rules is here
http://www.dir.ca.gov/InjuredWorkerGuide...ebook.html
you can also contact an I&A officer for specific information
http://www.dir.ca.gov/dwc/IandA.html