Office Hours: Mon/Wed 8AM–6PM | Tue/Th 8AM–5PM | Fri 8AM–12PM | Sat by appointment | 25620 Gibraltar Rd., Flat Rock, MI | (734) 789-9355

Call Us! (734) 789-WELL

Family Medicine Specialists


Our Doctors are longtime members in good standing with the American Osteopathic Association, the Michigan Osteopathic Association, the Michigan Association of Osteopathic Family Physicians, and Sigma Sigma Phi (Osteopathic Honors Fraternity).



Our highly trained and professional care team at Flat Rock Physicians includes our front desk personnel, medical assistants, phlebotomists, billing staff and Office Manager, Karen Jones.

Dr. Fretz

Dr. Jennifer Fretz is a 1993 graduate of Michigan State University College of Osteopathic Medicine. She served as Secretary and Vice-chair of Family Medicine at Oakwood Southshore Hospital.

Dr. Fretz is Board Certified in Family Medicine by the ABOFP. Dr. Fretz also has additional training in Dermatology. Flat Rock Aesthetics is onsite for skincare, laser therapy and, hair reduction.


Set up your online access at your next appointment. 


Dr. Patterson

Dr. David Patterson is a 1994 graduate of The Kirksville College of Osteopathic Medicine. He serves as the Chair of Family Medicine at Beaumont, Trenton Hospital.

He has served as a Clinical Instructor at MSU College of Osteopathic Medicine. He is a member of the Flat Rock Rotary. Dr. Patterson is Board Certified in Family Medicine by the ABOFP.


Set up your online access at your next appointment. 


Schedule an appointment today!

Flat Rock Physicians offers the option of making appointments by email if you do not have access to the Patient Portal.  Please email us and you'll receive a response within one business day, often the same day!

Dr. David Patterson

Dr. David Patterson is trained in Family Practice which allows him to provide high-quality medical treatment from birth through geriatrics.


Hospital Affiliations

Beaumont Health - Trenton

Henry Ford - Wyandotte

Dr. Jennifer Fretz

Dr. Jennifer Fretz is trained in Family Practice which allows her to provide high-quality medical treatment from birth through geriatrics.


Hospital Affiliations

Beaumont Health - Trenton

Henry Ford - Wyandotte

Family Doctor


From the "Top Thyroid Doctors in Michigan" website: Dr. Fretz is an outstanding primary care doctor. She is thorough, spends a lot of time, and truly investigates autoimmune conditions, including hypothyroidism. She is not reluctant to make referrals and always follows through. When was the last time you got a personal call from your doctor? Last Friday for me. The best thing that Dr. Fretz does is coordinate care. She calls the specialists you see directly so you don't have to navigate your diagnosis on your own. Thank goodness for Dr. Fretz who now accepts even more insurances.


Dr. Fretz is the best physician I have ever dealt with. She is compassionate, knowledgeable and generous with her time, ensuring that I receive top notch treatment. Most of all, she truly cares about me and my health. She pays attention to my concerns and readily makes referrals when needed. When I take the time to reflect on the things in life I am grateful for, Dr. Fretz is always at the top of the list. 

- Lisa J of Lincoln Park, a very satisfied patient

I just wanted to thank Dr. Patterson for his accurate diagnosis and treatment. Please let him know that I am pain-free now. The pains that I had are completely gone--they went away about 10 days after completing the antibiotics. I appreciated the way that Dr. Patterson explained the potential causes of the pain and that he was very thorough during the exam. He also listened closely to what I had to say and the concerns that I had. Also please thank Dr. Patterson for calling me with regards to the PSA test results. He eased some of my worries by agreeing to have my PSA levels tested despite my age, but with regard to family history.

-Scott S of the Downriver area

I've been seeing Dr. Fretz for over 10 years and I'm so happy with her and her staff.  My son now sees her too and is very happy.  She's helped me through my thyroid issues and has helped tremendously!  She is very personable and really cares.  Sometimes you may have to wait to see her,  but it's because she is so personable and cares about her patients.  She doesn't rush as some doctors do. I highly recommend Dr. Fretz as your primary care physician 🙂

~Jennie S - Flat Rock, MI 

Best physicians downriver! The staff is very friendly! Was in and out in less the 30 minutes!

~Becky Mullins

I have been coming to this office for 3 years now, and have had nothing but amazing service! The staff is so efficient and friendly, always quick to be able to fit my family and I on the schedule if need be. They are always to help when I have questions or need refills. I really love the online portal system where you can get results and message the doctors. The Doctors are so nice and knowledgeable. I have been to several downriver clinics and this is by far my favorite office. I can't imagine going to any other office!

~ Jessica Seymour

The staff is very nice and always very welcoming! I have been coming here since I was a baby and the office is always clean and decorated for holidays. They are very kid friendly and very kind!

~ Emily Jones

I absolutely trust Dr. Fretz. My family and I followed her from when she was in Southgate at Blanzy Clinic. Dr. Fretz not only diagnoses and treats, but she takes the time to explain details of her diagnosis and gives great information about the illness/affliction that's ailing you. As long as Dr. Fretz is practicing, I will be a patient.

~Ryan Shipman

About Us

Flat Rock Physicians

Ready to serve as your medical home!

Superbly qualified, board-certified family practice physicians available six days per week to meet all your general practice, pediatric, and geriatric care needs.


Call Us:
(734) 789-WELL (9355)

New Patients

* Accepting New Patients!

Our Doctors are trained in Family Practice which allows them to provide high-quality medical treatment from birth through geriatrics.

Healthcare for the Entire Family!

Flat Rock Physicians

Specializing in Family Medicine, with a focus on wellness, treatment, care management, prevention and quality of life.

If your insurance requires a referral, our office requests 14 business days to process. On the spot referrals will not be granted.

Medical Services

  • Osteopathic Manipulative Treatment (OMT)
  • X-Rays (in-office)
  • Ultrasound
  • Dermatologic Skin Exams to Diagnose Skin Cancer
  • Mole/Wart Removal
  • Flu Shots
  • Allergy Testing/Treatment
  • Diabetic Eye Exam
  • Vaccines
  • Pediatrics
  • Gynecology
  • Electrocardiography (EKG)
  • Work/School Physicals
  • Lung Function Testing
  • Orthopedic & Rheumatologic joint injections
  • Labcorp (in-office lab)
    Billing info. 800.845.6167 (8AM-5PM, M-F)