California Orthopaedic Association

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  • Home
  • About COA
    • Origin & History
    • Mission
    • Bylaws
    • COA Board of Directors – Committee Chairs – Roster
    • Advertising
    • Staff
    • Contact/Forms
  • Membership
    • Join COA
    • Members
    • COA Member Directory
    • Member Discounts
    • Residents
    • Job Bank
    • Expense Form
  • Annual Meeting/QME Course
    • 2026 Annual Meeting/QME Course
    • Print CME Certificates
    • Future Meetings
    • Past Annual Meetings & QME Courses

COA Member Directory

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Jason A. Davis, M.D.

Name
Jason A. Davis, M.D.
Status
Active
Medical Group
University Orthopaedic Associates
City
Clovis
Subspecialty
General

Lucas Seiler, M.D.

Name
Lucas Seiler, M.D.
Status
Active
Medical Group
University Orthopaedic Associates
City
Clovis
Subspecialty
Trauma

Mark Ayoub, M.D.

Name
Mark Ayoub, M.D.
Status
Active
Medical Group
University Orthopaedic Associates
City
Clovis
Subspecialty
Trauma

Maximino Brambila, M.D.

Name
Maximino Brambila, M.D.
Status
Active
Medical Group
University Orthopaedic Associates
City
Clovis
Subspecialty
General

Michael F. Charles, M.D.

Name
Michael F. Charles, M.D.
Status
Active
Medical Group
University Orthopaedic Associates
City
Clovis
Subspecialty
Hand/Wrist, Shoulder/Elbow

Motasem Refaat, M.D.

Name
Motasem Refaat, M.D.
Status
Active
Medical Group
University Orthopaedic Associates
City
Clovis
Subspecialty
Trauma

Nathan Hoekzema, M.D.

Name
Nathan Hoekzema, M.D.
Status
Active
Medical Group
University Orthopaedic Associates
City
Clovis
Subspecialty
Hand/Wrist, Shoulder/Elbow

Robert C. Kollmorgen, D.O.

Name
Robert C. Kollmorgen, D.O.
Status
Active
Medical Group
University Orthopaedic Associates
City
Fresno
Phone
559-459-4004
Subspecialty
Hip, Sports Medicine, Total Joint

Vlad Gendelman, M.D.

Name
Vlad Gendelman, M.D.
Status
Active
Medical Group
Urgent Orhopaedic Care
City
N. Hollywood
Phone
818-344-6784
Subspecialty
General, WC Medical-Legal, WC Treatment

Donald B. Longjohn, M.D.

Name
Donald B. Longjohn, M.D.
Status
Active
Medical Group
USC - Orthopaedic Surgery
City
Los Angeles
Phone
323-442-5860
Subspecialty
Arthritis, Hip, Knee, Total Joint
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Annual Meeting/QME Course

2026 Annual Meeting
Hilton Santa Barbara Beachfront Resort
April 16 – 19, 2026

Upcoming COA Events

  • Thu
    16
    Apr
    2026
    Sun
    19
    Apr
    2026

    2026 Annual Meeting/QME Course

    Hilton Santa Barbara Beachfront Resort

Get in Touch With Us

California Orthopaedic Association
1246 P Street
Sacramento, CA 95814

Phone: 916-454-9884
Fax: 916-454-9882
Email: admin@coa.org

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