This is a great overview of the IEP. Kids with physical disabilities may qualify as "other health impaired." This is a broad category which also includes ADD.
Parents need to consent to initial placement and substantial changes in placement and level of services. However, there are times when a parent's consent is not needed. If a change in services is less than a 25% change, no signature is needed.
Thanks for giving such a clear view of the IEP.