California Orthopaedic Association

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COA Member Directory

David J. Chao, M.D.

Name
David J. Chao, M.D.
Status
Active
Medical Group
Oasis Sports Medical Group, Inc.
City
San Diego
Phone
858-571-0606
Subspecialty

Michael D. Began, M.D.

Name
Michael D. Began, M.D.
Status
Semi-Retired
Medical Group
Ocean Orthopedic Surgery
City
Ventura
Phone
805-648-3902
Subspecialty

Ying Chi, M.D.

Name
Ying Chi, M.D.
Status
Active
Medical Group
OC Hand Surgery Specialist
City
Fountain Valley
Phone
714-434-3518
Subspecialty

Jack O. Piasecki, M.D.

Name
Jack O. Piasecki, M.D.
Status
Semi-Retired
Medical Group
Optimal Orthopedic Medical Group
City
Tustin
Phone
714-508-1112
Subspecialty
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Bradley S. Greenbaum, M.D.

Name
Bradley S. Greenbaum, M.D.
Status
Active
Medical Group
Orange Co Ortho & Sports Medical Group
City
Irvine
Phone
949-451-1454
Subspecialty
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Eric W. Lee, M.D.

Name
Eric W. Lee, M.D.
Status
Active
Medical Group
Orange Orthopedic Medical Group
City
Orange
Phone
714-538-8549
Subspecialty
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Paul A. Beck, M.D.

Name
Paul A. Beck, M.D.
Status
Active
Medical Group
Orange Orthopedic Medical Group
City
Orange
Phone
714-538-8549
Subspecialty
,

Michael B. Purnell, M.D.

Name
Michael B. Purnell, M.D.
Status
Active
Medical Group
OrthoMed Center
City
Modesto
Phone
209-524-4438
Subspecialty
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Paul J. Braaton, M.D.

Name
Paul J. Braaton, M.D.
Status
Active
Medical Group
OrthoMed Center
City
Modesto
Phone
209-524-4438
Subspecialty

Robert M. Cash, M.D.

Name
Robert M. Cash, M.D.
Status
Active
Medical Group
OrthoMedCenter
City
Modesto
Phone
209-524-4438/209-524-4649
Subspecialty
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Annual Meeting/QME Course

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

Upcoming COA Events

April 16 – 19, 2026
2026 Annual Meeting/QME Course
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April 1 – 4, 2027
2027 Annual Meeting/QME Course
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Indian Wells, CA (Palm Springs area)

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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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