Dr. Mary M. Koumas, DO | Lake Forest, CA | Family Physician

.about .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Mary Koumas specializes in family medicine, providing comprehensive care for patients of all ages. She earned her medical degree from A T Still University Kirksville College of Osteopathic Medicine and has been practicing for nearly five decades. Dr. Koumas is fluent in both English and Spanish.

Dr. Koumas is affiliated with MemorialCare Saddleback Medical Center and College Hospital Costa Mesa, with practice locations in Lake Forest and Laguna Hills, California. She focuses on managing high cholesterol and high blood pressure in her patients. Her services include preventive care such as flu vaccinations and comprehensive health assessments. Patients rate Dr. Koumas 4.3 out of 5 stars for her care.

Overview based on verified provider data

accepting new patients
4.3

19 Ratings
48 years of experience
speaks English, Spanish
A T Still University Kirksville College Of Osteopathic Medicine
8 written reviews
1 specialty
6 areas of expertise
2 hospital affiliations
2 office locations
Female

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me

Based on patient feedback. Read the reviews

Dr. Koumas' Ratings and Reviews

4.3

19 Ratings with 8 written Reviews

Average Wait Time 30 Minutes

How was your appointment with
Dr. Koumas?

Patients’ Perspective

Gave an accurate diagnosis: (11) Did WellNeeds Improvement (2)
Had a good bedside manner: (10) Did WellNeeds Improvement (2)
Spent time with me: (11) Did WellNeeds Improvement (2)
Provided follow-up after the visit: (10) Did WellNeeds Improvement (2)
Flexible scheduling: (11) Did WellNeeds Improvement (2)
Saw me in a timely manner: No Ratings
Staff was courteous: No Ratings

19 ratings & reviews

Sort:

Showing 1 to 8 of 8 reviews

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

I love Dr.Mary she treats me like family and takes very good care of all my needs and concerns. She spends time with me, and does research on any concerning issues and sends me to specialists when needed.

October 5th, 2020

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Mary Koumas is a awesome physician, she gave my mother the best care when dealing with my mother's diagnosis Alzheimer's and Dementia for 6 years. Now my mother is with the Lord Jesus. Dr. Mary is a awesome physician and a dear friend. Thank You Dr. Mary from me and my family

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

July 24th, 2020

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

the waiting time is rediculous even with an appointment, staff is rude no compassion for patients had to change doctors never will recommend this Dr. to anyone..

Did Well

Needs Improvement

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

October 29th, 2015

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Six week time frame to get an appointment. Dr. Koumas rarely in the office. Loves to prescribe pills to old people to move them in and out. Even when the patient doesn't know where they are, who the president is, she'll prescribe a pill and watch as the patient hands behind the driver seat getting ready to drive! No conscience this doctor.

Did Well

Needs Improvement

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

September 21st, 2015

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Doctor Mary has been our family doctor for over 23 years and she is the best. Typically runs late, but the wait is worth the care she provides.

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

August 13th, 2012

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

There are so many words to describe Dr Mary Koumas, but AMAZING would be the most appropriate. I have been seeing Dr Mary since 1988. She is caring, ...

Did Well

Gave an accurate diagnosis
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

August 7th, 2012

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Koumas is by far the best doctor I've ever seen but had to stop seeing her after many years for many reasons. The Pros- Dr. Mary Koumas is an excellent doctor, very caring, very knowledgeable and spends a good amount of time talking to you to understand the problem.The Cons- Her staff is terrible. The front desk is extremely curt, brusque, unfriendly and rude. Another issue is the wait time. Expect to wait between 45 mins - 1.25 hrs if you're seeing Dr. Mary (as she is know by her patients since her brother is also a doctor there). Even if you book the 1st appt. of the morning, there will be 2 or 3 other people booked at the same exact time as you!!! If you start your day by triple and quadruple booking like that, OF COURSE it's going to snowball throughout the day, EVERYDAY.It's too bad b/c Dr. Mary is an excellent, excellent doctor & I would have loved to continue seeing her as my doctor. It's been awhile but I haven't found a dr. I trust as much as her.I could have suffered… the unfriendly staff but the wait time just drove me nuts!

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

April 8th, 2010

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

I have been a patient of Doctor Koumas for over 30 years and I have always known her to compassionate, caring and generous with her time.

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Flexible scheduling

Needs Improvement

May 6th, 2009

Lake Forest Medical Group

24401 Muirlands Blvd Ste ALake Forest, CA 92630

Tel: (714) 597-7214

Mon9:00 am - 6:00 pm

Tue9:00 am - 6:00 pm

Wed9:00 am - 6:00 pm

Thu9:00 am - 6:00 pm

Fri9:00 am - 6:00 pm

SatClosed

SunClosed

Memorialcare Saddleback Medical Center

24451 Health Center DrLaguna Hills, CA 92653

Tel: (949) 837-4500


Dr. Mary M Koumas, DO	Dr. Claudia Eppele, MD	Dr. Mona Salib Ghobrial, MD	Dr. Neil Raaj Soni, MD
Family Medicine	Family Medicine	Family Medicine	Family Medicine
Accepts New Patients	Accepts New Patients	Accepts New Patients	Accepts New Patients
4.3 (19 Ratings)	0 (0 Ratings)	0 (0 Ratings)	4.5 (13 Ratings)
48 Years of Experience	29 Years of Experience		21 Years of Experience
No Virtual Visit Option	No Virtual Visit Option	No Virtual Visit Option	No Virtual Visit Option
Speaks English, Spanish	Speaks English	Speaks English, Arabic	Speaks English, Spanish, Indian (Hindi), Indian (Punjabi), Vietnamese
Lake Forest , CA	Costa Mesa , CA	Newport Beach , CA	Fountain Valley , CA
Med School: A T Still University Kirksville College Of Osteopathic Medicine	Med School: Universidad Autonoma De San Luis Potosi Facultad De Medicina	Med School: Ain Shams University, Bachelor of Medicine, Bachelor of Surgery	Med School: Northwestern University Feinberg School Of Medicine
Current Profile	View Profile	View Profile	View Profile

Search for your insurance and plan

Accepts Medicare
Accepts Medicaid

Family Medicine

Check-up
Contraception
Family Planning
Immunization
Influenza
Weight Loss

Dr. Mary M Koumas holds an expired medical license in the state of California.

Medical License

Doctor Of Osteopathy with an expired medical license in the state of California that expired in 2025.

Education & Training

Medical School

Graduated from A T Still University Kirksville College Of Osteopathic Medicine in 1978.

NPI Number

Dr. Koumas' NPI number is 1306838909.

Dr. Sidney Dale Nixon
Public Health & General Preventive Medicine
49 Years Exp | Riverside, CA
(0)
Dr. Darryl Mckinley Sexton
Dentistry
51 Years Exp | Long Beach, CA
(0)
Dr. Gloria Anne Schmidt
Public Health & General Preventive Medicine
68 Years Exp | Cypress, CA
(4)
Dr. Gary Michael Flashner
Emergency Medicine
46 Years Exp | La Palma, CA
(0)
Dr. Harold Kravitz
Dentistry
67 Years Exp | Costa Mesa, CA
(0)
Dr. James Paul Crossan
Osteopathic Medicine
49 Years Exp | Anaheim, CA
(0)
Dr. F A Nakamura
Dentistry
54 Years Exp | Long Beach, CA
(0)
Dr. Bernard Horowitz
Dentistry
64 Years Exp | Corona del Mar, CA
(0)
Dr. Alfred Thomas Pepino
Dentistry
64 Years Exp | Dana Point, CA
(0)
Dr. Corazon Delr Abundo
Pediatrics
58 Years Exp | Jamaica, NY
(0)

Is Dr. Mary M Koumas accepting new patients?: Dr. Mary M Koumas is accepting new patients on Vitals. View Dr. Mary M Koumas's profile on Vitals to make an appointment.
Does Dr. Mary M Koumas accept my insurance?: You can see the insurance plans that Dr. Mary M Koumas accepts on their Vitals profile.
What languages does Dr. Mary M Koumas speak?: Dr. Mary M Koumas speaks English and Spanish.
Does Dr. Mary M Koumas accept virtual/telehealth appointments?: Dr. Mary M Koumas has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Which hospitals is Dr. Mary M Koumas affiliated with?: Dr. Mary M Koumas is affiliated with Memorialcare Saddleback Medical Center and College Hospital Costa Mesa.

Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.

Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.

Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.

Copyright © 2026 Vitals Consumer Services, LLC. US Patent No. 8, 694, 441. All Rights Reserved.
As more fully set forth in this website's terms of use . (1) nothing contained on or offered by or through this website should be construed as medical advice and should not be relied upon for medical diagnosis or treatment. Vitals Consumer Services, LLC ("Vitals"). the provider of this website, does not recommend or endorse any particular healthcare provider whose information or ratings appear on this website; and (2) Vitals has granted you a limited license to access and use this website for your own noncommercial use. You are not permitted to copy, reproduce, distribute, transmit, mirror, frame, scrape, extract, wrap, create derivative works of, reverse engineer, decompile or disassemble any part or aspect of this website.