Can a physician be found negligent in diagnosing or treating a patient's medical condition under the Eighth Amendment?

a prisoner's civil rights have been abridged, "the indifference to his medical needs must be substantial. Mere 'indifference,' 'negligence,' or 'medical malpractice' will not support this cause of action." Broughton v. Cutter Laboratories, 622 F.2d 458, 460 (9th Cir. 1980), citing Estelle, 429 U.S. at 105-06. A complaint that a physician has been negligent in diagnosing or treating a medical condition does not state a valid claim of medical mistreatment under the Eighth Amendment. Even gross negligence is insufficient to establish deliberate indifference to serious medical needs. See Wood v. Housewright, 900 F.2d 1332, 1334 (9th Cir. 1990).