The most common non-covered services are
* Bone Graft, Orthodontic treatment for adults & Implants.
Some plans will "cover" some services but will downgrade them giving you a higher copay. The most common are:
* White fillings on molar teeth. Insurance will only cover the cost of a silver filling.
* Porcelain, ceramic, or zirconia crowns on molar teeth. Insurance will only cover the cost of a metal crown.
Coinsurance is a percentage of the total cost that you are responsible for (e.g., 20% for a root canal).
It is common for insurances to cover:
* 100% of preventive services
* 90-80% of basic services
* 50-60% of major services
Knowing your plan's percentages will help you plan for your expenses accordingly. Remember that all of these percentage payments get deducted from your annual maximums and that most services will have a frequency limitation.