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Donald J. Pratt MD
Practice closed to new patients.

Donald J. Pratt MD

(949) 364-6000
Primary Specialties
  • Internal Medicine
Medical Groups & Affiliations
  • Mission Heritage Medical Group

Primary Office

26800 Crown Valley Pkwy.
Suite 330
Mission Viejo, CA 92691
(949) 364-6000
(949) 364-9561
Mon - Fri: 8 a.m. - 5 p.m.
Web Page:
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5 out of 5 (306 Ratings | 50 Comments)


Dr. Pratt shows genuine interest and concern for his patients. He has been very supportive during my breast cancer treatment and has consulted with my otherhealth care providers.
Everyone was great! *Dr. Pratt - great! Staff - great!
Excellent experience.
I have complete confidence in Dr. Pratt and find him a warm, caring and friendly Physician. I cannot tell you how many people I have sent to him and they all feel exactly as I do..I can talk with him about my health and personal concerns and know I have his confidentiality, but most importantly, I also know his skills as a physician are of the highest quality! I completely trust and like him! thank you Dr. Pratt for caring for me the way you do!! [Name]
Dr. Pratt has been my primary care provider since the late eighties/early nineties. He has never steered me wrong on anything and over these many years has helped me through many medical problems. He is patient, understanding, and knows how to discuss a problem without alarming the patient. He is one of the hardest-working doctors around. I can think of very few times when I have called and he wasn't there. In my opinion, all doctors could take lessons from Dr. Pratt. He's the best!
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Physician Bio

Dr. Pratt graduated from UC Berkley in 1977. He obtained his Medical Doctorate degree from USC in 1981. His Internal Medicine residency was at UCI, completed in 1984. He served in the US Public Health Service from 1984 - 1987. He has been in practice in Mission Viejo since 1987. He has been with Mission Internal Medical Group since 1991. He is board certified in Internal Medicine.

Dr. Pratt is married with 2 daughters. His wife works full time as a registered nurse. One of his daughters is a UCLA graduate and is currently studying law. The other is an education major at Purdue University.


  • Residency:
    U.C. Irvine - 1984
  • Internship:
    U.C. Irvine - 1982
  • Medical School:
    USC - 1981
  • College:
    University of California Berkeley - Berkeley, CA - 1977


Board of Trustees, Mission Hospital 1999-2005
Past President Mission Internal Group

Areas of Interest

Internal Medicine

Board Certified, Diplomate Internal Medicine, 1984

Diplomate, National Board of Medical Examiners, 1982

Insurance ID Numbers

Aetna: *261589
Blue Cross: *AFN063
Blue Shield: 00G485020
CIGNA: 3704764008
CIGNA Select: 3704764018
Health Net: 3435013553
Health Net Senior: 5211013553
SCAN: 954-25920
United Healthcare: *0250360017

*Provider ID is the same for both HMO and Medicare Advantage Plans

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