Notice of Denial of Claim. If a claim is wholly or partially denied, the Plan Administrator shall notify the claimant of the denial of the claim within a reasonable period of time. Such notice of denial # shall be in writing, # shall be written in a manner calculated to be understood by the claimant, and # shall contain # the specific reason or reasons for denial of the claim, # a specific reference to the pertinent Plan provisions upon which the denial is based, # a description of any additional material or information necessary for the claimant to perfect the claim, along with an explanation why such material or information is necessary, and # an explanation of the Plan’s claim review procedure. Unless special circumstances require an extension of time for processing the claim, the Plan Administrator shall notify the claimant of the claim denial no later than ninety (90) days after receipt of the claim. If such an extension is required, written notice of the extension shall be furnished to the claimant prior to the termination of the initial 90-day period. The extension notice shall indicate the special circumstances requiring the extension of time and the date by which the Plan Administrator expects to render the final decision.