Can I have my claim reconsidered even though denied in the past?
If you have new evidence to support your previously denied claim, you should send a written request to your VA regional office to have your claim reopened. Include the new supporting evidence (or information telling VA where the evidence can be obtained). You may use VA Form 21-4138, Statement in Support of Claim, to submit your written request.
You may find the form at: http://www.vba.va.gov/pubs/forms/21-4138.pdf .