                           NOT FOR PUBLICATION                           FILED
                    UNITED STATES COURT OF APPEALS                       MAY 28 2019
                                                                      MOLLY C. DWYER, CLERK
                                                                       U.S. COURT OF APPEALS
                           FOR THE NINTH CIRCUIT

MICHAEL AARON WITKIN,                           No. 18-16040

                Plaintiff-Appellant,            D.C. No. 2:15-cv-00638-MCE-KJN

 v.
                                                MEMORANDUM*
MARIANA LOTERSZTAIN, Primary Care
Physician; et al.,

                Defendants-Appellees.

                  Appeal from the United States District Court
                      for the Eastern District of California
                Morrison C. England, Jr., District Judge, Presiding

                             Submitted May 23, 2019**

Before:      WALLACE, FARRIS, and TROTT, Circuit Judges.

      Michael Aaron Witkin, a California state prisoner, appeals pro se from the

district court’s summary judgment in his 42 U.S.C. § 1983 action alleging

deliberate indifference to his serious medical needs. We have jurisdiction under 28

U.S.C. § 1291. We review de novo. Toguchi v. Chung, 391 F.3d 1051, 1056 (9th


      *
             This disposition is not appropriate for publication and is not precedent
except as provided by Ninth Circuit Rule 36-3.
      **
             The panel unanimously concludes this case is suitable for decision
without oral argument. See Fed. R. App. P. 34(a)(2).
Cir. 2004). We affirm.

      The district court properly granted summary judgment on Witkin’s

deliberate indifference claim because Witkin failed to raise a genuine dispute of

material fact as to whether defendants were deliberately indifferent to Witkin’s

medical condition. See id. at 1057-60 (a prison official is deliberately indifferent

only if he or she knows of and disregards an excessive risk to inmate health;

medical malpractice, negligence, or a difference of opinion concerning the course

of treatment does not amount to deliberate indifference); see also Wilhelm v.

Rotman, 680 F.3d 1113, 1122 (9th Cir. 2012) (deliberate indifference requires

showing a purposeful act or failure to respond to a prisoner’s pain or possible

medical need and harm caused by the indifference). The record does not contain

any evidence that “the chosen course of treatment [for Witkin] was medically

unacceptable under the circumstances and was chosen in conscious disregard of an

excessive risk to his health.” Toguchi, 391 F.3 at 1-57-58. The record is equally

devoid of evidence indicating that any defendant intentionally ignored, or failed to

respond to, Witkin’s medical needs.

      The district court did not abuse its discretion by denying Witkin’s requests

for additional discovery after the deadline because Witkin failed to demonstrate

how the denial resulted in actual and substantial prejudice. See Laub v. U.S. Dep’t

of Interior, 342 F.3d 1080, 1093 (9th Cir. 2003) (“A district court is vested with


                                          2                                     18-16040
broad discretion to permit or deny discovery, and a decision to deny discovery will

not be disturbed except upon the clearest showing that the denial of discovery

results in actual and substantial prejudice to the complaining litigant. Prejudice is

established if there is a reasonable probability that the outcome would have been

different had discovery been allowed.” (citations and internal quotation marks

omitted)).

      The district court did not abuse its discretion by denying Witkin’s motion for

leave to amend his complaint after the close of discovery because granting leave to

amend would have caused undue delay and prejudice to defendants. See Jackson

v. Bank of Haw., 902 F.2d 1385, 1387-88 (9th Cir. 1990) (setting forth standard of

review and relevant factors for determining whether to grant leave to amend).

      The district court did not abuse its discretion in considering the expert

declaration of Dr. Barnett submitted by defendants in support of their summary

judgment motion. See Primiano v. Cook, 598 F.3d 558, 563, 566-67 (9th Cir.

2010) (setting forth standard of review and requirements for admitting expert

testimony).

      Because we conclude that the district court properly granted summary

judgment for defendants, we reject Witkin’s contention that the district court erred

by denying summary judgment in his favor.

      We do not consider arguments raised for the first time on appeal, or matters


                                          3                                       18-16040
not specifically and distinctly raised and argued in the opening brief. See Padgett

v. Wright, 587 F.3d 983, 985 n.2 (9th Cir. 2009).

      AFFIRMED.




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