What patients are saying
Overall rating
4.69
Average wait time
4.77
Bedside manner
4.72
“Dr. Co was very knowledgeable, efficient, and answered all my questions. I was able to get an appointment next day, and there was very little wait at the office.”
Heather S.February 12, 2026
“I saw Dr. Co to treat what I suspected was a fungal foot infection (fortunately, it wasn’t that!), and he was extremely professional and courteous. He explained my condition and recommended that I come back for a follow up in January 2026. I look forward to seeing him again! ”
Initials hiddenNovember 24, 2025
About Dr. Mark Co
Dr. Mark Co is a board-qualified podiatric physician treating patients in the San Francisco Bay Area. He is a staff physician with California Pacific Medical Center and St. Mary’s Medical Center.
Dr. Co did not start his career as a physician. He graduated Johns Hopkins University with a concurrent Bachelor’s and Master’s degree in Electrical and Computer Engineering. While working as an engineer for AT&T he completed an MBA at New York University Stern School of Business in the evenings. He subsequently pursued telecommunications and Internet product management opportunities rising to Director-level positions managing small teams of product managers.
Despite his success in high technology, he realized his calling through a defining moment volunteering at San Francisco General Hospital. He has spent nearly a decade realizing his goal of becoming a physician, the profession of his father, a general surgeon, and his mother, an anesthesiologist. Dr. Co attended the California College of Podiatric Medicine and graduated from an extremely competitive 3-year Kaiser Permanente Residency program in the Bay Area.
Dr. Co treats the full complement of foot and ankle issues. He provides general consultations, laser toenail treatment, custom orthotics, and treatment for issues including foot and ankle trauma, Achilles tendon ruptures, heel pain, bunions, hammertoes, ingrown toenails, corns/calluses, warts and gout among other pathology.
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In-network insurances
99% of patients have successfully booked with these insurances
Aetna
BlueCross BlueShield
Cigna
Medicare
UnitedHealthcare
UnitedHealthcare Oxford
Office location
Dr. Mark Co, DPM also offers online video visits for patients
Northern California Foot & Ankle Center
45 Castro St, Unit 315, San Francisco, CA 94114
Education and background
Practice names
Hospital affiliations
- California Pacific Medical Center - California Campus
- California Pacific Medical Center - Davies Campus
Board certifications
- American Board of Podiatric Surgery
- Foot Surgery (Podiatric Surgery)
- Reconstructive Rearfoot / Ankle Surgery (Podiatric Surgery)
Education and training
- Samuel Merritt University, California School of Podiatric Medicine, Doctor of Podiatric Medicine
- Kaiser Permanente Hayward Medical Center (Residency)
- Kaiser Permanente Fremont Medical Center (Residency)
- Johns Hopkins University (Bachelor's)
- Johns Hopkins University, Master’s in Electrical and Computer Engineering
- New York University, Master’s in Business Administration
Professional memberships
- American College of Foot and Ankle Surgeons
- American Podiatric Medical Association, Inc
- California Podiatric Medical Association
- American Academy of Podiatric Practice Management
Awards and publications
- “Arthroscopically-assisted minimally-invasive calcaneal ORIF” Glenn Weinraub DPM, Mark Co DPM MBA, Benjamin Cullen DPM, Gabriel van Gompel DPM. Presented at the 70th Annual Scientific Conference, San Antonio, TX, February 2012
- The surgical reconstruction of the rheumatoid midfoot and hindfoot deformities. Jason D. Neufeld DPM, Mark S. Co DPM MBA, Ernesto S. Hernandez DPM, Glenn M. Weinraub DPM. Clinics in Podiatric Medicine and Surgery 27(2010) 261-273.
- “Robust fixation construct for a trimalleolar ankle fracture in the setting of Osteogenesis Imperfecta: A Case Report” Glenn Weinraub DPM, Jason Neufeld DPM, Mark Co DPM MBA, Benjamin Cullen DPM. Presented at the 69th Annual Scientific Conference, Fort Lauderdale, FL, March 2011.
Languages spoken
- English
Provider's gender
Male
NPI number
1124316005
Patient reviews
All reviews have been submitted by patients after interacting with the practice.
Overall rating
4.69
Wait time
4.77
Bedside manner
4.72
Your trust is our top concern, so providers can't pay to alter or remove reviews. We also don't publish reviews that contain any private patient health information. Learn more here
231 reviews
Most relevant
Would not recommend. MD spent 4 minutes with me, never evaluated my foot and the entire visit was rushed and disorganized
September 29, 2025Whitney M.Verified patient
They spend 0 effort and expect the patient to handle all insurance communications, which is insane
October 17, 2025Xiang Y.Verified patient
Dr. Co gave me some very good advice and preferred lifestyle changes over expensive and invasive surgery. I appreciate that.
More than 1 year agoInitials hidden
Sensible recommendation for my issue. Glad to find a podiatrist who doesn't immediately want to pull out the scalpel and cut!
More than 1 year agoInitials hidden
All fine, but this is too much. I will never fill in one of these forms again.
Less than 1 year agoInitials hidden
It was very informative. Dr Co presented me with two treatment alternatives. Answered all questions. Thank you!
April 25, 2023Initials hidden
He taught me a lot of stuff and entertained all my questions.
November 20, 2025Rishabh M.Verified patient
Amazing!! It was seamless. My foot feels much better and I’m well informed about next steps
November 2, 2024Anne R.Verified patient
Office was pleasant. Doctor appears to know his stuff and has a very nice manner.
More than 1 year agoJerilyn M.Verified patient
The Visit was awesome. I got written tips on how I should procede with my issue and will be seeing Dr. Co soon.
May 30, 2013Initials hidden
The office was professional and kind. They really showed an invested interest in my concerns.
September 20, 2023Derrick W.Verified patient
Dr. Co, was receptive and honestly shared with alternatives that work to address my needs.
September 5, 2023Derrick W.Verified patient
I love my podiatrist and his staff. DR. MARK is gentle and compassionate. I will always come back.
July 24, 2014Patricia G.Verified patient
Dr. Mark was prompt, efficient and courteous. I will return to his office again if needed.
February 26, 2016Initials hidden
This is my 2nd procedure with dr co. He and his staff are knowledgable precise and caring
July 9, 2014Initials hidden
Approachable and knowledgeable. I left learning a new way to mitigate my bunion.
February 4, 2015Jen H.Verified patient
Incredibly rushed and rude. Felt dismissed. Would not visit again
April 15, 2023Initials hidden
I definitely will go back. No waiting, pleasant care.
September 20, 2023Lee A.Verified patient
I had a lot of questions for Mark and he was very patient.
More than 1 year agoLloyd S.Verified patient
He was really great and very solution focused. I'm very pleased
April 7, 2016Amber G.Verified patient
Excellent, cleared up my problem. Very quick and professional.
July 26, 2017Daniel C.Verified patient
I only waited about 3 mins. I was very satisfied overall.
February 21, 2017Justin B.Verified patient
Nice doctor who gave me new advice that was helpful.
December 29, 2021Paul H.Verified patient
very friendly, very knowledgeable, incredibly helpful.
March 5, 2016Initials hidden
Dr. Co is awesome.
Less than 3 months agoInitials hidden
Dr. Co was very knowledgeable, efficient, and answered all my questions. I was able to get an appointment next day, and there was very little wait at the office.
February 12, 2026Heather S.Verified patient
Professional. Efficient. I will go back.
February 2, 2026Frederick S.Verified patient
Clear communicator
January 15, 2026Terri A.Verified patient
I would recommend Dr Co
January 15, 2026Lynne D.Verified patient
I saw Dr. Co to treat what I suspected was a fungal foot infection (fortunately, it wasn’t that!), and he was extremely professional and courteous. He explained my condition and recommended that I come back for a follow up in January 2026. I look forward to seeing him again!
November 24, 2025Initials hidden
It was all good!
November 2, 2025Sharon P.Verified patient
I had a very painful callous. I previously saw a podiatrist whose "cure" lasted about a day and I was no better than when I started. Dr. Co swore he would do better than my last encounter and he did - and then some. I left the office and for the first time in months I could rely on my foot not sending me into convulsions! He's the real deal. See him!!
July 30, 2025Marcos E.Verified patient
Excellent service all the way around
June 25, 2025Roberta M.Verified patient
easy appointment at compatible time, Dr. Co is welcoming, knowledgeable and friendly. Able to diagnose and treat minor foot issue immediately in office. Have been to his office many times and always walk away satisfied. Highly recommending for any podiatry issues.
June 24, 2025William D.Verified patient
I had a very disappointing experience with my doctor at the Foot & Ankle Center. The doctor seemed extremely rushed and impersonal, and they caused me pain without asking for my consent to proceed with the procedures. It felt like they didn’t even review my chart before our meeting and didn’t ask many questions about my condition or how I was feeling. Overall, I felt neglected and uncared for during and after my appointment. I would not recommend this practice to others.
Less than 1 year agoInitials hidden
Easy as could be - great appointment!
January 10, 2025Tom P.Verified patient
I was taken 5-10 min early, but my appt was for 3pm and I was shown my way out at 2:58pm. That’s how little time the dr spent with me :/ I didn’t get to explain all the issues I had been having and what I have tried in the past, pain level etc. I told him I had an abscess on one toe and an ingrown on the other. He hardly looked at the toe with the abscess, and the toe with ingrown he said he thought it was just calluses. So he started scraping it with a little tool and that hurt, it caused my toe to start bleeding. I kept flinching but he kept going. Then he accidentally cut the side of my toe where he wasn’t even working, and said “sorry I nicked you” but it was painful and blood was literally dripping down my toe but all he did was put on a bandaid. He told me to soak it every day for two weeks and come back if it wasn’t better. I ended up going back to urgent care because I bled through my sock and it pooled into my shoe. Really sad cause he was so highly recommended by my dr.
August 30, 2024Karina H.Verified patient
Dr. Co is terrific. Great listener. Gives good information about dealing with whatever problems you have with your feet. Highly recommend.
My only problem was I got conflicting messages about the time of my appointment. One message said 9, one said 10. Had to call office to confirm time. They said it was the fault of Zocdoc but don't know.
July 12, 2024Karen T.Verified patient
My experience today with Dr. Ko and the staff at this office was very good. I was in the exam room on time (even a couple of minutes before my actual scheduled appt) and Dr. Ko was good at explaining what he thought was happening with my heel pain and how to start the process of healing it. Big thumbs up for the entire expereince.
June 17, 2024Kimberly F.Verified patient
I really liked Dr Co. He has a gentle manner and seems to be a good listener.
The appointment felt a little rushed, and I believe it's because appointments are scheduled to be 15 minutes long at this practice (I could be wrong). Maybe that is industry standard, but I think that's a too short for a new patient.
November 8, 2023Initials hidden
Good experience. Not sure if I will return.
March 29, 2023Robert N.Verified patient
New to SF and chose a provider after reading numerous reviews online. Made the right choice as Dr. Co was efficient, nice, and knowledgeable, along with his staff. Would recommend!
January 12, 2023Rachel M.Verified patient
Dr. Co was efficient, and helpful about my feet problems, that my Kaiser insurance does not cover. I would continue care with Dr. Co
December 12, 2022Bj D.Verified patient
I am a long-time runner with a very proactive approach to resolving issues mechanical issues. Mark provided an informative and insightful assessment and diagnosis. I look forward to working with him in the future.
November 17, 2022David S.Verified patient
Very happy yeah he told me everything that was wrong and what I needed to do and have suggested a couple of things that took care of me right away he was wonderful
October 28, 2022Michael S.Verified patient
Dr. Co is knowledgeable and attentive. He actively listened to my complaints and provided an insightful diagnosis and treatment plan. I recommend Dr. Co and will return to him if I experience any issues with my feet in the future.
October 18, 2022Donald B.Verified patient
Excellent care: Excellent doctor
Efficient, informative. great bedside manner, precise diagnosis, solid treatment plan. Easy follow up appointment scheduling.
DEFINITELY RECOMMENDED!
November 15, 2017JIYOUNG C.Verified patient
Dr. Mark is awesome - highly recommend
August 16, 2017Kimberly M.Verified patient
Very informative, quick service, friendly staff & great office. The staff was very friendly kind & polite the office was beautiful clean & organized.
Dr.Co explained what my problem was in great detail & then discussed all my options & really took away all my worries & fears. This is a great office with a great staff & an wonderful doctor
October 15, 2016Stephanie D.Verified patient
Super quick& efficient.
July 27, 2016Marissa B.Verified patient
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How soon can I make an appointment with Dr. Mark Co?
Generally, Dr. Mark Co has appointments available on Zocdoc within 1 week. You can see Dr. Co's earliest availability on Zocdoc and make an appointment online.
Is Dr. Mark Co accepting new patients?
Dr. Mark Co generally accepts new patients on Zocdoc. You can see Dr. Co's earliest availability on Zocdoc and schedule an appointment online.
Does Dr. Mark Co accept my insurance?
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Can I make an appointment with Dr. Mark Co online?
Yes, you can make an appointment online with Dr. Co using Zocdoc. It’s simple, secure, and free.
Which hospital is Dr. Mark Co affiliated with?
Dr. Mark Co is affiliated with California Pacific Medical Center - California Campus and California Pacific Medical Center - Davies Campus.
What practice does Dr. Mark Co work with?
Dr. Mark Co works with Northern California Foot & Ankle Center.
Where is Dr. Mark Co's office located?
Dr. Mark Co has 2 office locations in San Francisco, view full addresses on Dr. Co's profile.
Which board certifications does Dr. Mark Co have?
Dr. Mark Co is certified by American Board of Podiatric Surgery, Foot Surgery (Podiatric Surgery), and Reconstructive Rearfoot / Ankle Surgery (Podiatric Surgery).
What are common reasons for patients to see Dr. Mark Co?
Dr. Mark Co frequently sees patients for Foot Consultation, Podiatric Care, Sports Injury, Surgery Consultation, and X-ray. You can see other visit reasons for Dr. Mark Co on their profile.
What languages does Dr. Mark Co speak?
Dr. Mark Co speaks English.
How do patients rate Dr. Mark Co in reviews?
231 patients have reviewed Dr. Mark Co. The overall rating for this doctor is 4.69/5. They have a 4.72/5 rating for bedside manner and a 4.77/5 rating for wait time. You can read individual reviews and ratings on their profile.