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Yes,
Dedicated per region fee
$2 per hour - An additional fee is charged once per hour in which at least one Dedicated Instance of any type is running in a region.
-https://aws.amazon.com/ec2/pricing/dedicated-instances/
- Monthly Dedicated Per Region Fee: 730 hours x 2 USD = 1460.000000 USD
- Yearly cost: 1460 x 12 = 17520 USD
@Kate, it is actually stated in the AWS HIPAA Compliance Whitepaper that "Amazon EC2 instances that customers use to process, store, or transmit PHI are run on Dedicated Instances (Dedicate Hosts are also acceptable for BAA eligibility)"
But to answer the original question - there is no cap on how much you can spend on the Dedicated fee. The good news is that you can have your whole environment in one Region, so you can at least pay this fee for only one region.
From the AWS HIPPA Compliance white paper as at Jan 2017
Amazon EC2 instances that customers use to process, store, or transmit PHI are run on Dedicated Instances (Dedicate Hosts are also acceptable for BAA eligibility), which are instances that run in an Amazon VPC on hardware Amazon Web Services – Architecting for HIPAA Security and Compliance dedicated to a single customer. Dedicated Instances are physically isolated at the host hardware level from instances that are not Dedicated Instances and from instances that belong to other AWS accounts. For more information on Dedicated Instances click here.
If i purchase Dedicated Host and run Ec2 on it. Is Ec2 free or i have to pay host + ec2 fee?
you are locking down a single piece of hardware just for your purposes.
Dedicated Instance does not work like this. Your instance runs on some dedicated hardware. Its not lockdown to you. If you stop/start instance, you can get some other hardware somewhere else. Basically, the hardware is "yours" (you are not sharing it with others) for the time your instance is running. You stop/start it, you may get different physical machine later on (maybe older, maybe newer, maybe its specs will be a bit different), and so on. So your instance is moved around on different physical servers - whichever is not occupied by others at the time.
With Dedicated Host the physical server is basically yours. It does not change, it's always the same physical machine for as long as you are paying.
Dedicated Host
As soon as you 'allocate' a Dedicated Host, you start paying for that whole host.
A host computer is very big. In fact, it is the size of the largest instance of the selected family, but can be divided-up into smaller instances of the same family. ("You can run any number of instances up to the core capacity associated with the host.")
Any instances that run on that Host are not charged, since you are already being billed for the Host.
That is why a Dedicated Host is more expensive than a Dedicated Instance -- the charge is for the whole host.
Dedicated Instance
"Dedicated Instances are Amazon EC2 instances that run in a virtual private cloud (VPC) on hardware that's dedicated to a single customer... Dedicated Instances may share hardware with other instances from the same AWS account that are not Dedicated Instances."
This means that no other AWS Account will run an instance on the same Host, but other instances (both dedicated and non-dedicated) from the same AWS Account might run on the same Host.
Billing is per-instance, with a cost approximately 10% more than the normal instance charge (but no extra charge if it is the largest instance in the family, since it requires the whole host anyway).