What is the test for denying disability benefits on the basis that the claimant is impaired to the point that he can no longer perform his previous work?

Under the Social Security Act, a claimant is ineligible for disability insurance benefits unless, among other things, he suffers an impairment "of such severity that he ... cannot, considering his age, education, and work experience, engage in any ... kind of substantial gainful work which exists in the national economy." 42 U.S.C. 423(d)(2)(A) ; see also id. 423(a)(1)(E). Accordingly, even where a claimant is impaired to the point that he can no longer perform his previous work, the Commissioner may properly deny benefits if, considering the claimants "residual functional capacity"i.e. , his physical capabilities notwithstanding his impairment, 20 C.F.R. 404.1545 "and [his] age, education, and work experience," the claimant "can make an adjustment to other work," id. 404.1520(a)(4)(v). If benefits are denied on this basis, however, the Commissioner bears the burden of "show[ing] that there is work in the national economy that the claimant can do." Poupore v. Astrue , 566 F.3d 303, 306 (2d Cir. 2009) (per curiam).