William M. Ko, MD
Fullerton, CA 92835
- Mission Heritage Medical Group and Affiliated Physicians
- St. Joseph Heritage Medical Group and Affiliated Physicians
- St. Jude Heritage Medical Group and Affiliated Physicians
St. Jude Heritage Fullerton - Pain Medicine
100 East Valencia Mesa Drive, Suite 310, Fullerton, CA 92835
Insurances Accepted
This information provides an overview of accepted insurance plan types. Coverage may vary by specific plan. Please verify your with your insurance provider before visiting us for care.
- TriWest - Tricare
- United HealthCare PPO
- Providence Health Plan - Medicare Advantage
- Blue Shield of CA HMO - Trio
- Health Net - Medicare Advantage
- Blue Shield of CA HMO
- Anthem Blue Cross Medicare Advantage
- Anthem Blue Cross Medicare PPO
- Anthem Blue Cross HMO
- Blue Shield of CA Medicare Advantage
- Vivity by Anthem Blue Cross
- Health Net PPO
- Aetna HMO
- Aetna Medicare Advantage HMO
- Aetna Medicare Advantage PPO
- Aetna PPO
- Cigna HMO
- SCAN Medicare Advantage
- Health Net HMO
- Multiplan PPO
- Blue Shield of CA PPO
- United Healthcare HMO
- Cigna PPO
- Anthem Blue Cross PPO
- US Family Health Plan - TriCare
- Coventry/First Health PPO
- HealthSmart (Interplan) PPO
- No results found
Please contact your insurance provider to verify coverage.
You're not covered
Unfortunately, this provider doesn’t accept your insurance or plan.Don’t worry, we can help you find other providers who do.
View More Providers
About William M. Ko
Dr. William Ko is board certified in Anesthesiology and Pain Medicine practicing for over 12 years in Orange County. Dr. Ko completed medical school at University of Southern California before finishing his anesthesiology residency at Harbor-UCLA Medical Center and his pain medicine fellowship at UCLA Medical Center. His areas of interest include chronic musculoskeletal pain, spine pain, neuropathic pain, interventional pain management, spinal cord stimulation, and intrathecal pumps. Dr. Ko believes in working with patients and their families to create a comprehensive treatment plan to manage their pain condition.
- American Board of Anesthesiology, Anesthesiology
- American Board of Anesthesiology, Pain Medicine
100 East Valencia Mesa Drive, Suite 310
Fullerton, CA 92835
Providence St. Jude Medical Center
Community Reviews
At Providence, we're dedicated to providing you quality, personalized health care. We are constantly striving to optimize your experience.
As part of ensuring you have a positive experience with Providence, our online provider directory includes ratings and patient comments for select providers. More about our survey.
Love the care I receive at st Jude's Dr Ko especially
Providence Patient
I appreciate Dr. Ko listening to my concerns and request. He provided his preferred medication and explained why, and acted quickly to address my needs.
Providence Patient
Prompt met with Dr Ko discusses my pain issue.
Providence Patient
Dr. Ko is extremely competent in his expertise in pain management. I trust him with my ability to walk and not be an invalid.
Providence Patient
Very satisfied with the care
Providence Patient
Great pain Dr
Providence Patient
Dr Ko is exceptional
Providence Patient
Has always taken very good care of me!! Very satisfied with this doctor!!
Providence Patient
Doctor and his staff are rated highly in my opinion. In and out for procedure, very professional and courteous. Prayers the procedure works for me.
Providence Patient
They have improved the quality of care and made it easier to obtain necessary medicines
Providence Patient
I love the service I love my doctor he's the greatest and the nurses are the greatest also they are always smiling even when I'm in a lot of time they are always there to make me smile and take good care of me they let me know what I need and what I don't need and I thank them with all my heart God has really really been good to me when he gave me a Doctor William Cole and his staff and hope I never have to leave from there either really really good pain management doctor Dr James is the greatest also and I still would like to have my surgery from him I just had a mishap that I could not because I have no one to watch over you and I need it badly love you all and may God bless you and may be with you have a blessed day [name] God bless you
Providence Patient
Dr Ko is an outstanding physician. He is a pain specialist, and is very cognizant of the problems in my back. I receive injections in two different parts of my back spaced 3 months apart that allow me to maintain my mobility. Dr Ko explains things thoroughly and carefully analyzes any new changes. With his care I have a much more normal life.
Providence Patient
He did such a good job there was no pain at all happy happy.
Providence Patient
100% satisfied patient
Providence Patient
In just the last 5 or 6 months the nurses and office has improved!Dr Ko is always exceptional!
Providence Patient
Very helpful
Providence Patient
Overall very pleased
Providence Patient
Good
Providence Patient
Doctor and staff do an excellent job.
Providence Patient
Dr. Ko is Always Very Attentive and Helpful.
Providence Patient
DR.KO IS VERY KIND AND EXPLAINS EVERYTHING THROUGHLY. HE IS INTUNED WITH HELPING YOU GET THE CARE YOU NEED. I HAVE SEEN HIM 6 OR 7 TIMES NOW.
Providence Patient
Doctor and staff were excellent!
Providence Patient
Courteous, attentive and concern
Providence Patient
Wonderful care from Dr Ko and his staff.
Providence Patient
Great group.
Providence Patient
Thank you for your excellent care as always~
Providence Patient
Every thing about Dr. Ko and his people are amazing and kind but the only thing was I had to wait 5 months to get my injections for my bursas so for 5 months I had extremely agonizing pain which effected my ability to drive and walk and do any kind of stairbut over all there the best.
Providence Patient
Very pleased, I love my doctors
Providence Patient
After the visit and treatment, I do have less pain.
Providence Patient
Dr Ko was a little late but because of his careful attention, he is well worth waiting for!!!
Providence Patient
Dr. Ko, Is a caring, sincere physician; he provided very good treatment.
Providence Patient
I have been a patient of Dr. Ko's for well over a decade now. During that time, he was the only physician in the area qualified to perform thoracic spinal epidurals which I was in desperate need of. Dr. Ko has been and continues to be a vital part of my medical journey. Without the exceptional quality of care, those brilliant minds constantly thinking outside the box & refusing to accept the limits he & a few of his fearless colleagues were given, I am certain I would not be able to use my limbs today. Though my pain is completely debilitating, my freedom is priceless THANK YOU
Providence Patient
All good.
Providence Patient
Dr.Ko is a very good provider and that's why I continue going back to him for certain procedures
Providence Patient
Dr. Ko performed a great procedure. I was happy with the doctor and staff and rate them superior.
Providence Patient
Very caring and professional manner.
Providence Patient
Dr. Ko listens to my concerns, but I prefer not to wait long periods of time for my appointments.
Providence Patient
We're dealing with my spine and I've been with Dr Ko's office team for many many years & I TRUST him with my spinal care.
Providence Patient
Dr. Ko is a phenomenal pain management physician. He understands physiology and my pain issues and knows where to apply treatment to maximize my ability to continue functioning. He literally keeps me moving and pain free to low pain.
Providence Patient
Dr Ko has always been very informative regarding my procedure.
Providence Patient
I had this past problem for over 5 months. I went the ER, that's when the treatment was put into place it was handled within 1 1/2 weeksWeeks. It truly has been a blessing. My pain is gone,, I'm feeling normal again. [Name(s)]
Providence Patient
My doctor Dr ko is very wonderful very kind and very understanding and a great doctor thank you
Providence Patient
Doctor KO, was excellent, unexplained the procedure as he was doing it. For example, a numbing the area near the sacrum where he was putting the shots in. He would always let me know that at this time he was numbing it and then he was placing the medicine in he did this on both the right and left sides.He explained everything as he Was performing the procedure. He told me what my limitations were on that day and future days.I was very impressed with the staff as they called me the next day to see how I was doing. Also to let me know that the shots that he put in might take a couple weeks to take effect and to just not overdo it.The staff was very attentive from the moment I checked in verified. I had a driver and took me immediately and took my blood pressure and vitals prior to the procedure and got me in the gown and everything ready to do the procedure.I have had this done before in February 2025. And this time did not disappoint. They were so professional, and Dr. Cole explained everything like I said above as he was injecting my back as far as putting in the numbing process and then the medicine going inI would definitely recommend this doctor and this group at Val Mesa. Also, they called to verify my follow up appointment with Dr. KO'sPA Dr. Estrada.Thank you for making this procedure as easy as possible.
Providence Patient
Dr Ko has been and excellent and professional at all of my visits
Providence Patient
As Always, Thanks
Providence Patient
Dr Ko is kind and listens to my concerns
Providence Patient
Dr. KO EXPLAINED EVERYTHING TO ME. HE LISTENED TO ME COMPLETELY AND THEN TOLD ME WHY MEDICATION TESTING ARE SOIMPORTANT. EVEN THOUGH I AM 74 YEARSI HAVE BETTER UNDERSTANDING ABOUT MEDICATIONS. HE IS EXTREMELY KIND , EXTREMELY KNOWLEDGEABLE AND UNDERSTAND ABOUT A PATIENT FEELINGS
Providence Patient
My interactions and care with all staff since I changed to St Jude Heritage Medical Group have been top notch. I'm very happy with my providers, the offices and the care I am receiving.
Providence Patient
Professional, courteous and very caring!
Providence Patient
Great Doctor
Providence Patient
Always the best experience visiting Dr. Ko , he's the best Dr. I have ever had.
Providence Patient
I find that St Jude's Providence is much better than Sharp hospital
Providence Patient
Dr Ko is a wonderful doctor. He is an excellent listener, and asks questions when he needs clarification. He is friendly and efficient! I love the way who cares about how /what is hurting, and how you are feeling!
Providence Patient
A big experience for me but the doctor and staff were great. It makes a difference when you have a procedure and you have a caring team.
Providence Patient
My doctor is very good. His staff is very nice and kind.
Providence Patient
Great staff. Great Doctor
Providence Patient
Very good experiences & super pleased with my care at Dr. Ko's office!
Providence Patient
Good
Providence Patient
Dr Ko is very good and very nice. His staff is very nice too.
Providence Patient
Very thorough doctor, wait time has been much longer than expected.
Providence Patient
Dr Ko is absolutely wonderful. He has a calming way about him that relaxes the patient.
Providence Patient
Dr. Ko is great and shows compassion. His staff is also timely with refills and efficient
Providence Patient
My Doctor schedule was running late, but gave me full attention on my treatment.
Providence Patient
Dr is caring and understanding. Always answers questions with satisfaction. He is a very kind Dr
Providence Patient
Dr Ko is excellent and caring but having to wait 3-4 months for an epidural when in extreme pain with compressed vertebra and spinal fractures is too long. He is booked out 3 and 4 months ahead. He is excellent when you get in to see him.
Providence Patient
I have very good experience each time I go into the office to see the doctor or any other doctor in the system that I've been seeing they all done. Excellent work I've seen 45 different doctors and they're all good.
Providence Patient
All good
Providence Patient
Doctor Ko is amazing
Providence Patient
Dr. Explained even thing to me in detail. After appt. I feel great!
Providence Patient
Dr.Ko was very compassionate, knowledgeable,and attentive relating to my present health issues and gave me positive vibes on my future course of action..
Providence Patient
Staff and Doctor are always friendly and thorough.
Providence Patient
Dr Ko is very knowledgeable and treats me with respect.
Providence Patient
Office is well-run, organized and professional.
Providence Patient
Excellent provider and staff
Providence Patient
Dr Lo and I staff are always providing me with the best care possible and I highly recommend them to anyone who needs help in pain management. [Name(s)] [Date] 2025
Providence Patient
Dr. Ko is the best
Providence Patient
I received a follow up phone call from this office inquiring if all was well after my procedure. Very much appreciated!!
Providence Patient
This provider and his staff are extremely efficient and kind. They respond to my chart messages quickly and address many of my concerns and questions.
Providence Patient
No complaints
Providence Patient
It's pretty good overall if it is just a follow up appointment and if the doctor knows you well.
Providence Patient
Love Dr Ko. Very attentive!!
Providence Patient
Dr Ko and his staff are excellent. Dr Ko is a doctor that always provides excellent care with kindness and compassion. He is an expert in his field. His staff is equally as wonderful. I have been Fortunate to have Dr Ko as My pain management position for 15 to 16 years. He provides above and beyond care. He listens clearly and is knowledgeable with kindness in his answers. I appreciate Dr Ko and his staff immensely
Providence Patient
Dr Ko always talks me through my procedure
Providence Patient
My conditions are chronic, with little available in the way of 'standard' treatments. My practitioner has done an amazing job at improving his knowledge about my conditions, reads up on clinical trials and other research publications, and has made it clear that they actually care about me as the patient.They make the patient a critical part of the health care team, treating for the patient, not the illness or just following the CDC standard practice...
Providence Patient
Excellent provider takes time to explain things very compassionate Md
Providence Patient
Excellent care from this provider Dr. William Ko and his staff!!! Kindness & dignity to me are shown during my visits!!!
Providence Patient
EXCELLENT
Providence Patient
He's amazin%
Providence Patient
Dr. Ko always professional and curteous
Providence Patient
Dr Ko is logical, professional, personable, and he cares!
Providence Patient
Dr Ko is kind and understanding, listens well and is flexible
Providence Patient
My experience was good.
Providence Patient
Dr. William Ko is an outstanding doctor. Honest and trustworthy.
Providence Patient
Dr Ko is a good doctor. He is kind and helpful with my questions. He has compassion for his patients.
Providence Patient
Dr Ko and his staff are very kind and helpful.
Providence Patient
Great Dr
Providence Patient
Dr. Ko always does an excellent job in his service to me . He makes sure that my health and wellbeing is good. Dr. Ko is a great doctor. I have been seeing him for years.
Providence Patient
Dr. Ko is a very caring and compassionate Dr.I appreciate being his patient.
Providence Patient
Pls continue your good service.
Providence Patient
Dr Ko's office is great! His staff takes care with trying to help me if I have a problem and I appreciate the prescription refill line for always trying to get my refill request to Dr Ko and then to my pharmacy in a timely manner. I would recommend Dr Ko and his office to anyone I know looking for a doctor with his specialty. I like the MyChart app too! It makes It really easy to check In and send messages to Dr Ko and to my other doctors at Providence St Jude. I've also found It really easy to go to St Mary's facilities near my home for X-rays, Imaging, Urgent care, etc. You make It so easy and I love that they have access to my records
Providence Patient
Very professional in advising what treatment would relieve severe back pain.
Providence Patient
Thanks, Dr. Ko !! [Name(s)]
Providence Patient
I received excellent care from all affiliated with this practice. The wait to get an appointment can be frustrating
Providence Patient
Dr ko practice/office /staff excellent, professional and knowledgeable about my care. Friendly and compassionate since I have so much pain. Very attentive before/ during. After procedure. Always have after care phone call for any questions or post op issues such as bleeding.
Providence Patient
Always efficient, kind and good care
Providence Patient
Dr. Ko is understanding and helpful.
Providence Patient
Dr Ko was exceptional! I had an epidural and he explained everything from start to finish. He gave me an epidural earlier in the year and it was so successful I came from Michigan to get another one. The office staff is very accommodating as well.
Providence Patient
Always good!
Providence Patient
Dr. William Ko is a great doctor. I have no complaints.
Providence Patient
Excellent service. Very caring and professional.
Providence Patient
Love Dr. Ko rapport!!!
Providence Patient
It is so convenient to have video visits
Providence Patient
Dr Ko is very professional always takes the time to know his patients and has empathy for his patients
Providence Patient
Conditions and Procedures
- Amplified Musculoskeletal Pain Syndrome (Amps)
- Cancer Pain
- Causalgia Of Lower Limb
- Causalgia Of Upper Limb
- Chronic Migraines
- Chronic Pain
- Degenerative Spine Pain
- Diabetic Neuropathy
- Erythromelalgia
- Facet Joint Syndrome
- Failed Back Surgery Syndrome
- Fibromyalgia
- Hiv Neuropathy
- Intractable Pain
- Lumbosacral Radiculopathy
- Methadone Treatment
- Migraine
- Mononeuritis
- Mononeuritis Multiplex
- Nerve Compression Syndrome
- Neuralgia
- Neuritis
- Neuropathy
- Opioid Issues
- Pain Amplification Syndromes
- Pain Management
- Peripheral Neuropathy
- Persistent Pain After Orthopedic Surgery
- Phantom Limb
- Plexitis
- Polyneuropathy
- Post Laminectomy Syndrome
- Post Radiation Pain
- Postherpetic Neuralgia
- Radiculopathy
- Reflex Sympathetic Dystrophy
- Severe Pain
- Spinal Stenosis
- Spine Injection
- Virtual Care
I have had this procedure before and Dr Ko made an effort to make the procedure as painless as possible
Providence Patient