Dr. William M. Ko, MD
- Medicare services, 2024
- 3,437
- Medicare patients, 2024
- 262
- Part D claims, 2024
- 2,396
- Publications
- 1
- Hospital affiliations
- 1
- Practice address
- 100 E Valencia Mesa Dr, Fullerton, CA 92835
- Practice phone
- Call (714) 738-4282
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mesa Surgicenter
Fullerton, California
Find Dr. Ko's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William M. Ko is a pain medicine (anesthesiology) physician in Fullerton, California
Dr. Ko practices at Mesa Surgicenter in Fullerton, California.
Dr. Ko's NPI, 1629011762, was assigned on June 14, 2006. Dr. Ko graduated from Keck School of Medicine of USC in 2000. Dr. Ko holds California license A82916.
- NPI
- 1629011762NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5092714162
- NPI enumeration date
- June 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (714) 738-4282
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William M. Ko practices at Mesa Surgicenter in Fullerton, California
Dr. Ko's primary practice is Mesa Surgicenter, at 100 E Valencia Mesa Dr, Fullerton, CA 92835 in Orange County. The practice phone is (714) 738-4282.
- Mesa Surgicenter100 E Valencia Mesa Dr, Fullerton, CA 92835 · Orange CountyPhone(714) 738-4282
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. William M. Ko is affiliated with 3 sites of care and 1 medical group
Dr. Ko's primary practice is Mesa Surgicenter in Fullerton, California. Dr. Ko is also affiliated with Providence St. Jude Medical Center. The medical group on file is St. Jude Heritage Medical Group. Dmand AI also links Dr. Ko to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. William M. Ko's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ko practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mesa Surgicenter | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William M. Ko is one of 492 pain medicine (anesthesiology) physicians in California
Pain medicine is Dr. Ko's primary specialty in the NPI Registry, under taxonomy code 207LP2900X. Dr. Ko is board certified in anesthesiology by the American Board of Anesthesiology. Dr. Ko is licensed in California.
Specialties and state licenses
- Pain medicine (anesthesiology), CaliforniaPrimary
Clinical focus
Dmand AI lists back pain injection, lower back pain, muscle pain, fibromyalgia, and limb pain, neck pain and spine problems and thoracic spine disorders among the conditions Dr. Ko treats.
Pain medicine (anesthesiology) physicians near Dr. Ko
Counts of pain medicine (anesthesiology) physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William M. Ko billed Medicare for 3,437 services in 2024
CMS data shows 3,437 Medicare services from Dr. Ko across 13 procedure codes in 2024, for 262 Medicare patients. Medicare paid $108,720 for them. Every service was in an office.
Dr. Ko's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 2,5562024: 2,6403%
- Office and hospital visits
- 2023: 4282024: 4567%
- Surgery
- 2023: 2872024: 34119%
Dr. Ko compared with the California median for pain medicine (anesthesiology) physicians, 2024
- Dr. Ko
- California median
- Medicare services
- 3,437vs 5746.0 times
- Medicare patients
- 262vs 18542% above
- Part D claims
- 2,317vs 2519.2 times
Medians across 451 pain medicine (anesthesiology) physicians in California with Dmand AI profiles that report each measure.
Dr. Ko's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Ko?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ko and other pain medicine (anesthesiology) physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William M. Ko treated 262 Medicare patients in 2024, average age 75
CMS counts 262 Medicare patients who saw Dr. Ko in 2024. The largest group is 75 to 84, with 104 patients. 75% of them have arthritis, and 75% have high blood pressure. 13% are also on Medicaid. Their average risk score is 1.42, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ko's median patient age at 72, with 64% women.
Dr. Ko's Medicare patients by age, 2024
Dr. Ko's Medicare patients by sex, 2024
- Women16161%
- Men10139%
Chronic conditions among Dr. Ko's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Diabetes32%
- Mood disorders31%
- Depression29%
- Anxiety26%
- Osteoporosis26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ko's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women64%
- Men35%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William M. Ko wrote 2,396 Medicare Part D claims in 2024
In 2024, Dr. Ko wrote 2,396 Medicare Part D claims for 411 patients. 97% of them were for generic drugs. CMS names the drug for 2,317 of them, across 30 drugs with 11 or more claims each, at $68,305 in total drug cost. In 2023, CMS named 2,585 claims across 30 drugs.
Dr. Ko's Part D claims by kind of drug, 2024
- Generic2,335 claims97%
- Brand-name61 claims3%
Dr. Ko's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Ko's Part D claims, 2024
- Opioids52%1,253 of 2,396 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,5852024: 2,31710%
Drugs named by CMS: 30 in 2024, 30 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. William M. Ko offers telehealth to Medicare patients
Dr. Ko accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ko as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. William M. Ko has 1 publication on record
Dmand AI links 1 paper to Dr. Ko.
Recent publications by Dr. Ko
See who Dr. Ko researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ko works with, so you can find a warm path to the right pain medicine (anesthesiology) physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William M. Ko received $3,888 in industry payments from 2016 to 2025
CMS Open Payments shows 235 general payments to Dr. Ko from 37 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Medtronic, Inc. paid the most, $898.
General payments to Dr. Ko by program year, 2016 to 2025
Companies that paid Dr. Ko the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William M. Ko graduated from Keck School of Medicine of USC
Dr. Ko graduated from Keck School of Medicine of USC in 2000.
- Medical school
- Board certified in anesthesiology
- Board certified in pain medicine
Source: Dmand AI Professional Profile Data
Dr. William M. Ko accepts plans from 12 insurance carriers
Dr. Ko is in network with 12 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Elevance
- HCSC
- Alliant Health Plans
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
- +4 more carriersWith a free account
Plan types Dr. Ko accepts, by number of carriers
- PPO7
- HMO6
- EPO4
- Medicare4
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. William M. Ko's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William M. Ko
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William M. Ko's NPI number?
Dr. William M. Ko's NPI number is 1629011762. It was assigned on June 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William M. Ko?
Dr. William M. Ko is a pain medicine (anesthesiology) physician in Fullerton, California. The primary specialty in the NPI Registry is Pain Medicine (Anesthesiology) Physician (taxonomy code 207LP2900X).
Where does Dr. William M. Ko practice?
Dr. Ko practices at 100 E Valencia Mesa Dr, Fullerton, CA 92835. Dr. Ko's primary practice is Mesa Surgicenter in Fullerton, California. Dmand AI also links Dr. Ko to 1 group practice or clinic.
What is Dr. William M. Ko's office phone number?
The practice phone on file for Dr. Ko is (714) 738-4282.
What is Dr. William M. Ko's medical license number?
Dr. Ko holds California license A82916.
Which hospitals is Dr. William M. Ko affiliated with?
Dr. Ko is affiliated with Providence St. Jude Medical Center.
What medical group is Dr. William M. Ko part of?
Dr. Ko is linked to St. Jude Heritage Medical Group.
Does Dr. William M. Ko accept Medicare?
Yes. CMS data shows Dr. Ko billed Medicare for 3,437 services in 2024, and Dr. Ko accepts Medicare assignment.
Does Dr. William M. Ko offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ko as offering telehealth services.
How many Medicare patients does Dr. William M. Ko see?
CMS counts 262 Medicare patients who saw Dr. Ko in 2024, with an average age of 75.
Show 8 more questionsShow fewer questions
Is Dr. William M. Ko board certified?
Yes. Dr. Ko is board certified in anesthesiology by the American Board of Anesthesiology.
What services does Dr. William M. Ko bill to Medicare?
In 2024, Dr. Ko's most billed Medicare services were injected or infused drug (J3301), office visit, established patient (99214) and surgery: brain, spine and nerves (62323).
Where did Dr. William M. Ko go to medical school?
Dr. Ko graduated from Keck School of Medicine of USC in 2000.
What drugs does Dr. William M. Ko prescribe most?
In 2024 Medicare Part D data, Dr. Ko's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Gabapentin and Oxycodone-Acetaminophen.
Has Dr. William M. Ko received payments from drug or device companies?
CMS Open Payments shows $3,888 in general payments to Dr. Ko from 37 companies from 2016 to 2025. The largest total came from Medtronic, Inc.
How long has Dr. William M. Ko been practicing?
Dr. Ko graduated from medical school in 2000, 26 years ago.
Does Dr. William M. Ko do research?
Dmand AI links 1 publication to Dr. Ko.
What insurance does Dr. William M. Ko accept?
Dr. Ko is in network with 12 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
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