IHC Medical Providers
Chief Medical Officer
Dan Calac, MD
Credentials: MD, MPH, FAAP
Harvard Medical School, Residency and Internship at University of Southern California and Los Angeles County combined Internal Medicine and Pediatrics program, John Hopkins School of Public Health
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Specialties: Internal Medicine and Pediatrics
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Providing care at IHC for 22 years
Assistant Medical Director
Elaine Davidson, MD
Credentials: MD
Loma Linda University School of Medicine, Residency at University of California at Irvine Medical Center
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Specialties: Family Medicine
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Providing care at IHC for 18 years
Provider
Fie Gamble, DNP
Credentials: DNP, FNP-C, MBA
Indiana State University
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Specialties: Family Medicine, All Ages
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Providing care at IHC for 10 years
Provider
Cindy Adriano, PA-C
Credentials: MPAP, PA-C
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University of Southern California
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Specialties: Family Medicine
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Providing care at IHC for 20 years
Provider
Nick Nguyen, FNP-C
Credentials: FNP
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Georgetown University
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Specialties: Family Practice
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Providing care at IHC for 6 years
Provider
Rollena Guachino, FNP-C
Credentials: Certified Family Nurse Practitioner
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California State University San Marcos & Pacific College
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Specialties: Family Practice
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Providing care at IHC for 18 years
Provider
Janelle Imber, FNP
Credentials: RN-MSN, FNP
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Walden University
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Specialties: Type 1 and 2 Diabetes
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Providing care at IHC since May 2025, on-call to full time