The following excerpt is from Macri v. Chater, 93 F.3d 540 (9th Cir. 1996):
The claimant has the burden of proving that he became disabled prior to the expiration of his disability insured status. Id. at 1463. The claimant must prove not only the existence of an impairment but that the impairment prevents him from performing his past work. Matthews v. Shalala, 10 F.3d 678, 681 (9th Cir.1993).
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