I wanted to add that it may happen that some or all carriers choose to make the PPACA-compliant changes to existing plans on one unified date. Likely this will be the portfolio renewal date.
So, it may be that your existing pre-9/23 healthcare plan gets the upgrade at the renewal of your plan anniversary or on January 1, 2011. 
Realistically it makes more sense cost- and logistics-wise for a carrier to make the unified upgrade instead of spacing them out over a period of 12 months. 
I will post when I receive clarification from each carrier on how they intend to process the upgrades to existing coverage plans.
PPACA Update on Existing CA Plan Upgrades You On Here » California , healthcare , Individual Health , PPACA » PPACA Update on Existing CA Plan Upgrades
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