Ordered that the order is reversed, on the law, with costs, the motion is granted, and the proceeding is dismissed as time-barred.
The claimant seeks uninsured motorist benefits or "supplemental uninsured motorist insurance," which is colloquially known as underinsurance benefits ( see S'Dao v. National Grange Mut. Ins. Co., 87 NY2d 853, 854). The instant proceeding was commenced more than 20 days after service upon the petitioner of a "notice of intention to arbitrate" pursuant to CPLR 7503 (c) ( see Matter of Blamowski [Munson Transp.], 91 NY2d 190, 195; Matter of Nationwide Ins. Co. v. Singh, 6 AD3d 441, 442; Matter of Nassau Ins. Co., 100 AD2d 969, 970; cf. Matter of New Hampshire Indem. Co. v. Vranica, 294 AD2d 287). Accordingly, the instant proceeding to stay arbitration was time-barred ( see Matter of Steck [State Farm Ins. Co.], 89 NY2d 1082, 1084; Matter of State Farm Ins. Co. v. Karvalis, 7 AD3d 533).