An individual (or proper applicant) must file an application to be entitled under
the deemed insured provision. Except as provided in this section, the regular rules
on applications apply (e.g., who may file, what constitutes an application).
The CMS-18-F5 (Application for Part A (Hospital Insurance)) is the application specifically
designed for establishing deemed insured entitlement. However, all retirement age
applications which will be disallowed because the individual is not eligible for such
benefits may serve as an application for deemed insured hospital insurance (HI).
NOTE: The CMS-18-F5 is also an application for monthly Retirement and Survivors Insurance
(RSI) benefits.