Questione giuridica chiave
Whether the informal cost approval could be retroactively revoked or revised under ATSG Art. 53
Decisione estratta
The initial approval was a binding quasi-decision; retroactive correction was only possible if a reopening ground under Art. 53 ATSG existed.
Motivazione estratta
The later review revealed a new factual basis: the required missing teeth did not exist, except for one tooth. This was a new, material fact not previously discoverable, so procedural revision was available.