(3) Disability claims. In the case of a claim for disability benefits, the plan administrator shall notify the claimant, in accordance with
paragraph (g) of this section, of the plan's adverse benefit determination within a reasonable period of time, but not later than 45 days after receipt of the claim by the plan. This period may be extended by the plan for up to 30 days, provided that the plan administrator both determines that such an extension is necessary due to matters beyond the control of the plan and notifies the claimant, prior to the expiration of the initial 45-day period, of the circumstances requiring the extension of time and the date by which the plan expects to render a decision. If, prior to the end of the first 30-day extension period, the administrator determines that, due to matters beyond the control of the plan, a decision cannot be rendered within that extension period, the period for making the determination may be extended for up to an additional 30 days, provided that the plan administrator notifies the claimant, prior to the expiration of the first 30-day extension period, of the circumstances requiring the extension and the date as of which the plan expects to render a decision. In the case of any extension under this paragraph (f)(3), the notice of extension shall specifically explain the standards on which entitlement to a benefit is based, the unresolved issues that prevent a decision on the claim, and the additional information needed to resolve those issues, and the claimant shall be afforded at least 45 days within which to provide the specified information.