Second level of the appeal process for an individual applying for SSDI or SSI. This is a hearing before an administrative law judge who had no part in the initial or reconsideration disability determination.

In the Medicare program, this is Level 2, an independent determination related to insurance claims in which a party has appealed a review decision within 6 months of the date of notice of the decision; the hearing is rendered by a hearing officer assigned by the contractor. For Level 2, there is no requirement regarding the amount of money in controversy.

Frequency with which the heart beats, calculated by counting the number of QRS complexes or ventricular beats in one minute.