William T. Ko, M.D.
Dermatology Physician · Phoenix, AZ
William T. Ko, M.D. is a dermatology physician with a practice address in Phoenix, Arizona, and NPI 1841230976, issued on Jun 7, 2006. Check the license (Arizona 26333, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- William T. Ko
- Credential
- M.D.
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- 26333 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 2224 W Northern Ave Ste D300, Phoenix, AZ 85021
- Phone
- (602) 277-1449
- Enumerated
- Jun 7, 2006
- Record last updated
- Oct 25, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (602) 277-9984
- Medicaid ID
- 686868 AZ
- Medicare enrollment
- Enrolled (PECOS I20101020001483); accepts Medicare assignment
- Medical or professional school
- Northeastern Ohio University College Of Medicine, 1994
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 350 in Arizona → Look up another NPI →
Also registered at 2224 W Northern Ave Ste D300
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Crandall, M.D.Dermatology Physician1780863092
- Meghan DayPhysician Assistant1285345140
- Aubrey Downey, PA-CPhysician Assistant1639759525
- John Ebner, D.O.MOHS-Micrographic Surgery Physician1295927788
- Peter Sigal, DODermatology Physician1013457662
- Marlene Wright, FNPFamily Nurse Practitioner1215977467
Verify William T. Ko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 26333Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% more Medicare Part D claims than the average dermatology physician in 2024
1,368 Medicare Part D claims for 643 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 21 claims were for opioids.
Most prescribed
- Mupirocin484 claims
- Ketoconazole115 claims
- Valacyclovir84 claims
- Fluticasone Propionate79 claims
- Imiquimod67 claims
- Triamcinolone Acetonide62 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 63 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,713.88
153 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 10,250 providers of this specialty with any payment received $8,544.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Center For Dermatology PLLCScottsdale, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William T. Ko among 350 dermatology physician records in Arizona
William T. Ko, M.D. is one of 350 dermatology physician records with a practice address in Arizona. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1994 · median 2008 among the 241 with a school on file
- Record last updated2018 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207N00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in Arizona
There are 350 dermatology physician records in Arizona.
All 350 in Arizona → Every provider in Phoenix → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Michael Crandall, M.D.Phoenix, AZ 850211780863092
- Peter Sigal, DOPhoenix, AZ 850211013457662
- Yi Gao, MDPhoenix, AZ 850201457857336
- Morgan Mackey, D.O.Phoenix, AZ 850201699087809
- Deborah Mendelson, MDPhoenix, AZ 850201508852492
- Adam Norberg, MDPhoenix, AZ 850181487048583
- Brett Thomas, DOPhoenix, AZ 850181548848492
- Christopher Bengson, M.D., M.H.S.Phoenix, AZ 850161063619484
Common questions
What is William T. Ko, M.D.'s NPI number?
William T. Ko, M.D.'s National Provider Identifier (NPI) is 1841230976, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William T. Ko, M.D. located?
The NPPES record lists a practice address at 2224 W Northern Ave Ste D300, Phoenix, AZ, 85021. Phone: (602) 277-1449. Providers update this record themselves, so call before visiting.
How can I verify William T. Ko, M.D.'s license?
NPPES lists Arizona license number 26333, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William T. Ko, M.D. prescribe under Medicare Part D?
In 2024, William T. Ko, M.D. had 1,368 Medicare Part D claims for 643 beneficiaries; the average among dermatology physician prescribers was 797. Part D covers Medicare prescriptions only.
What is William T. Ko, M.D.'s MIPS final score?
The 2023 MIPS final score is 63 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.