Veterans/ claims
Implicit denial rule can apply to separately-filed claims, both formal and informal.
This does not violate statutory due process protections.
http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/14-7130.Opinion.1-5-2016.1.PDF
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.