Therapeutic services for Alzheimer's patients. For a long while, Medicare didn't consider various therapies for people who had been formally diagnosed with Alzheimer's disease medically necessary, and so did not cover them.

This policy has changed. If the person in your care has been diagnosed with Alzheimer's, Medicare Part B can now cover physical, occupational, and speech therapy for her, as well as psychological counseling and other mental health services. Her doctor must prescribe the treatment, however, and it must be provided by a Medicare-certified therapist or mental health provider.

Medications for mental health conditions. Any medication administered to someone when she's a hospital or nursing facility inpatient, whether or not she's an Alzheimer's patient, is covered by Medicare Part A. Any medication given to her at her doctor's office or at any outpatient health facility is covered by Medicare Part B. Things get much trickier with prescription drugs taken at home. The only coverage Medicare provides for at-home medications is through a Medicare Part D prescription drug plan. Coverage for specific drugs the doctor may prescribe for mental health issues depends on the formulary -- the covered list of drugs -- that her plan maintains.

There's a special prohibition, however, on certain drugs that are often prescribed to cope with mental health issues. Medicare doesn't permit a Part D prescription drug plan to cover any medication within the categories of barbiturates (certain sedatives) and benzodiazepines (certain tranquilizers), even if a physician has prescribed it. So if she's taking one of these drugs, and she'd like to have coverage from her Part D drug plan, ask her doctor whether a similarly effective drug might be available that does not technically fall into either of these categories.