Our Services

Internal Medicine

Mission Heritage Medical Group’s Internal Medicine department has provided ongoing health care for patients across Orange County for the past 40 years. As internists, or doctors of Internal Medicine, they treat adult patients with a focus on the diagnosis, management and non-surgical treatment of unusual or serious diseases.

Many internists are sub-specialists, meaning that they generally limit their medical practice to problems of one organ system or to one particular area of medical knowledge.

Internists have a lengthy clinical and scientific training in their areas of medical interest and have special expertise in the use of prescription drugs or other medical therapies (as opposed to surgery). While the name "internal medicine" may suggest that internists only treat problems of internal organs, this is not the case. Internists are trained to treat patients as whole people, not as mere organ systems.

View Our Locations

San Clemente

Laguna Niguel – Town Center Drive

Internal Medicine

  • 26800 Crown Valley Pkwy.
    Suite 305, 315, 325, 330
    Mission Viejo, CA 92691
  • (949) 364-6000

Meet Our Doctors

Mehrnaz Badie, MD (949) 364-6000
Internal Medicine (Board Certified)
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Office :
26800 Crown Valley Pkwy.
Suite 325
Mission Viejo, CA 92691
Eric O. Benner, MD (949) 364-6000
Internal Medicine (Board Certified)

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 315
Mission Viejo, CA 92691
Robert V. Eller, DO (949) 364-6000
Internal Medicine (Board Certified)

Mon - Fri 7:30 a.m. - 5:30 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 305
Mission Viejo, CA 92691
Mark Hauptman, MD (949) 364-6000
Internal Medicine

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 305
Mission Viejo, CA 92691
Torsten Kruse, MD (949) 364-5600
Internal Medicine (Board Certified)
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Office :
Mission Heritage Medical Group
831 Via Suerte
Suite 102
San Clemente, CA 92673
Khadija Mayet, MD (949) 364-6000
Internal Medicine (Board Certified)
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Office :
26800 Crown Valley Pkwy.
Suite 315
Mission Viejo, CA 92691
Michael Morris, MD (949) 364-6000
Internal Medicine

Mon - Fri: 9 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 325
Mission Viejo, CA 92691
Madineth Muy, MD (949) 364-6000
Internal Medicine

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 325
Mission Viejo, CA 92691
Office :
26800 Crown Valley Pkwy.
Suite 325
Mission Viejo, CA 92691
Joe T. Nguyen, MD (949) 364-6000
Internal Medicine

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 315
Mission Viejo, CA 92691
Office :
26800 Crown Valley Pkwy.
Suite 305
Mission Viejo, CA 92691
Office :
26800 Crown Valley Pkwy.
Suite 315
Mission Viejo, CA 92691
Donald J. Pratt, MD (949) 364-6000
Internal Medicine

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 330
Mission Viejo, CA 92691
Office :
831 Via Suerte
Suite 102
San Clemente, CA 92673
Office :
26800 Crown Valley Pkwy.
Suite 325
Mission Viejo, CA 92691
Amy Underwood-Jolly, MD (949) 364-6000
Internal Medicine

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 330
Mission Viejo, CA 92691
Office :
26800 Crown Valley Pkwy.
Suite 315
Mission Viejo, CA 92691
Kelly E. Williams, MD (949) 364-6000
Internal Medicine

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 305
Mission Viejo, CA 92691
Janet Yazdi, MD (949) 364-6000
Internal Medicine

Mon - Fri: 8 a.m. - 5 p.m.

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Office :
26800 Crown Valley Pkwy.
Suite 305
Mission Viejo, CA 92691