Summary

Dr. Justin Mager is an internal medicine physician with 22 years of clinical experience treating adult patients. He earned his medical degree from Jefferson Medical College of Thomas Jefferson University and completed his residency training at California Pacific Medical Center Pacific. His extensive background in internal medicine allows him to provide comprehensive primary care for a wide range of health conditions affecting adults.

Dr. Mager practices at Marinhealth Medical Center in Greenbrae, California, where he focuses on treating joint-related conditions including arthritis pain, joint stiffness, and knee discomfort. His approach to care often incorporates physical therapy and strength training to help patients improve their mobility and function. He also coordinates occupational therapy services when patients need support with daily activities. Patients rate Dr. Mager 4.4 out of 5 stars for his compassionate and thorough approach to internal medicine care.

Overview based on verified provider data

Quick Facts

  • 4.4
  • 22 years of experience
  • 12 insurance plans accepted
  • California Pacific Medical Center Pacific
  • 5 written reviews
  • 1 specialty
  • 8 areas of expertise
  • 1 hospital affiliation
  • 1 office location
  • Male

Office Location

Marinhealth Medical Center

599 Sir Francis Drake Boulevard Ste 206Greenbrae, CA 94904

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Dr. Justin Joseph Mager, MDEric HarkerDr. Nima Ghadimi, MDDr. George Mousa, MD
Internal MedicineInternal MedicineInternal MedicineInternal Medicine
Accepts New Patients Accepts New Patients Accepts New Patients
4.4 
3.9 
3.8 
22 Years of Experience 25 Years of Experience 29 Years of Experience 17 Years of Experience
No Virtual Visit Option Virtual Visit Available Virtual Visit Available Virtual Visit Available
Speaks English Speaks English, Spanish
Greenbrae , CALyons , COScottsdale , AZUpland , CA
Med School: Jefferson Medical College Of Thomas Jefferson University Med School: Duke University School Of Medicine Med School: Univ Iberoamericana Unibe Santo Domingo Med School: University Of Aleppo Faculty Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Justin Joseph Mager

  • Aetna
  • Anthem Blue Cross
  • BLUE CROSS of CALIFORNIA
  • Blue Shield of California
  • Cigna
  • Kaiser Permanente
  • Medicaid - Medicaid
  • Medicare
  • Medicare - Medicaid
  • Medicare - Medicare
  • Partnership HealthPlan of California
  • UnitedHealthcare

Medical Specialties

Dr. Justin Joseph Mager has the following specialty

Specialty Expertise

Dr. Justin Joseph Mager has the following 8 areas of expertise

  • Check-up
  • Heartburn
  • Holistic Health
  • Immunization
  • Physical
  • Vaccination
  • Weight Loss
  • Weight Loss (non-surgical)

Certifications, License, & Education

22 Years Experience

MEDICAL LICENSE

Medical Doctor, California, 2026, Expired

EDUCATION & TRAINING

Residency

California Pacific Medical Center Pacific

Medical School

Jefferson Medical College Of Thomas Jefferson UniversityGraduated in 2006
Sidney Kimmel Medical College At Thomas Jefferson UniversityGraduated in 2004

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Frequently Asked Questions

Does Dr. Justin Mager accept my insurance?
You can see the insurance plans that Dr. Justin Mager accepts on their Vitals profile.
How can I make an appointment with Dr. Justin Mager?
You can find contact information for Dr. Justin Mager here on Vitals.
Where is Dr. Justin Mager's office located?
Dr. Justin Mager's office is located at 599 Sir Francis Drake Boulevard Ste 206, Greenbrae, CA, 94904.
Which hospitals is Dr. Justin Mager affiliated with?
Dr. Justin Mager is affiliated with Marinhealth Medical Center.
Does Dr. Justin Mager accept virtual/telehealth appointments?
Dr. Justin Mager has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.

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