The document contains two sample authorization letters for PhilHealth. Too busy to go to the PhilHealth office?Learn how to make an authorization letter so your representative can transact with PhilHealth on your behalf. Named Individual Participant(s):. b. I, Princess Natalie Rubianes, am writing this letter to authorize Maria Teresa Castañeda to act on my behalf regarding my PhilHealth-related transactions. EXAMPLE. Signature Authorization Letter. ODNR, Division of Mineral Resources Management. The MDT shall discuss the treatment plan of the patient prior to the preauthorization application for the Z Benefits. Accomplish the BIR Form 1700 in triplicate. Bring authorization letter (if needed) and Form 2316 as proofs of tax withheld.