Thank you for your question. I look forward to working with you to provide you the information you are seeking for education purposes only.
Legally, you have a duty to notify your patients what insurance you do or do not accept any longer. There is no law preventing you from giving notice to the patients regarding what plans you will accept even under the same AHCCCS company, since if a patient comes to you with the plan you no longer accept their bills will not get paid.
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This is NOT the practice of law nor is it legal advice to you, it is merely educational information for you to use to seek out a licensed attorney in your state to get actual legal advice from them. Please use sites such as http://www.martindale.com or http://www.lexmundi.com or http://www.hg.org to find a local attorney to get actual legal advice in all matters.