Filing a disability VA appeal must be done within one year of a Rating Decision for benefits and should only be filed if you disagree with a recent Rating Decision. The appeals process is complex and requires much paperwork as well as adherence to strict deadlines.
You will file for a rating increase claim if your claim is over a year old and your condition has worsened since your last Rating Decision.
Post-traumatic stress disorder claims are frequently denied, often for lack of evidence or improper evidence of the condition. A PTSD disability appeal gives you a chance to present new evidence.
Please be sure to contact a certified VA disability attorney for help with either a VA appeal or ratings increase claim.