I need to know the medicare regulations concerning what a registered
nurse, a license practical nurse and a nursing aid can do in HOME
HEALTH (not nursing home or hospital)in the state of Virginia.
For example: The nursing aid can help position the patient, bathe him,
etc.
The licensed practical nurse can give medications etc.

Greetings Nacho123, and thank you for your question.
I have looked up the Virginia Board of Nursing regulations documents.
One thing about medications is that all three nurse types can
prescribe controlled substances in a limited scope under the
Regulations For Prescriptive Authority For Licensed Nurse
Practitioners (see second source link below).

Here are other basic duties based on the Glossary listed below (I'm
sure what's mentioned here can be applied to nurses working at
someone's home):

Registered Nurse
- RNs oversee the total care of the patient and may delegate duties to
other nurses. Among other tasks, they are qualified to start IV fluids
or medications.

Licensed practical nurse: 
- May tube-feed patients, monitor and discontinue IVs and other
similar jobs.

Certified nursing aide: 
- May perform tasks such as bathing patients, lifting patients and
changing basic dressings.

Sources:
Glossary: Types of Nurses 
http://www.pilotonline.com/special/nurses/glossary.html

Virginia Board of Nursing Regulations (list of Word documents)
http://www.dhp.state.va.us/nursing/nursing_laws_regs.htm

Sunrise "At home" Assisted Living - job descriptions
http://www.athomeassistedliving.com/team/community_care_center.asp

Risk Management Alert - The Delegation of Nursing Tasks and Procedures
in Virginia
http://www.reciprocalgroup.com/Periodicals&News/RM%20Briefings/RM%20Briefing%20-%20The%20Delegation%20of%20Nursing%20Tasks%20and%20Procedures%20in%20Virginia%20-%20March%202000.PDF

Risk Management Alert - The Nurse Practice Act and Patient Abandonment
http://www.reciprocalgroup.com/Periodicals&News/RM%20Alert/RM%20Alert%20-%20Virginia%20The%20Nurse%20Practice%20Act%20and%20Patient%20Abandonment%20-July%202001.pdf

Code of Virginia - Board of Nursing
http://www.dhp.state.va.us/nursing/leg/Chapter%2030.doc

Official Medicare site
http://www.medicare.gov

I also found in the searches that having a nurse at home is called
"assisted living" at home.
I found no information on the US government's Medicare website about
instructions on duties for nurses. I suppose they are governed by the
Nursing board of the particular state.

Google search terms:
Virginia nurse duties
Virginia nurse regulations
nurse duties Virginia assisted living
nurse home Virginia assisted living
nurse Virginia medicare regulation
nurse Virginia tasks

I hope this answer has helped you. If you need something clarified, do
post on it. Thanks.

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Clarification of Answer by techtor-ga on 03 Apr 2003 01:48 PST

Here's something I'd like to add. It's a description of practical
nursing tasks at a certain institution (namely Butler Farm Campus):

http://www.nhgs.tec.va.us/VoTech/licensed_nurse.html

hi,
i just waana know the fields and oppurtunities in nursing,scope of
nursing practice,and ethico-moral aspects in nursing...........
i badly needed it im a nursing student.....