Mark Williams, MBBS
Anesthesiology Physician · Rochester, NY
Mark Williams, MBBS is an anesthesiology physician with a practice address in Rochester, New York, and NPI 1295178242, issued on Apr 9, 2013. Check the license (New York 286923, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark Williams
- Credential
- MBBS
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- 286923 NY
Self-reported in NPPES; status is on the state search - Practice location
- University OF Rochester Medical Ctr, Rochester, NY 14642
- Phone
- (585) 275-1384
- Enumerated
- Apr 9, 2013
- Record last updated
- Jul 7, 2023
- Medicare enrollment
- Enrolled (PECOS I20170802000131); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 5,062 in New York → Look up another NPI →
Also registered at University OF Rochester Medical Ctr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- John Herrmann, LMHCMental Health Counselor1275540650
- Kathryn Karch, PH.D.Clinical Psychologist1437570124
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- Philip Katzman, M.D.Anatomic Pathology Physician1275556557
Verify Mark Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 286923Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average anesthesiology physician in 2024
38 Medicare Part D claims for 25 beneficiaries, against an average of 402 among the 4,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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): 74.4 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: $714.20
24 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 17,774 providers of this specialty with any payment received $669.59 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
- U OF R Anesthesiology GroupRochester, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Williams among 5,062 anesthesiology physician records in New York
Mark Williams, MBBS is one of 5,062 anesthesiology physician records with a practice address in New York. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 72% of them.
- NPI issued2013 · 72% of these records are older, 26% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2007 · median 2006 among the 3,612 with a school on file
- Record last updated2023 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
267 anesthesiology physician records list a practice address in Rochester
They are 267 of the 20,520 NPPES records with a practice address in Rochester, and 5,062 anesthesiology physician records in New York.
All 5,062 in New York → Every provider in Rochester → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Adam Booser, MDRochester, NY 146421932167111
- Stephen Breneman, M.D.Rochester, NY 146421568498483
- Zana Cabakborovcanin, MDRochester, NY 146421477586774
- Mary Cherran, M.D.Rochester, NY 146421336174838
- Ashwani Chhibber, M.D.Rochester, NY 146421225061237
- Alan Curle, M.D.Rochester, NY 146421164455192
- Carol Diachun, M.D.Rochester, NY 146421487688446
- Joseph Fullone, MDRochester, NY 146421770572505
Common questions
What is Mark Williams, MBBS's NPI number?
Mark Williams, MBBS's National Provider Identifier (NPI) is 1295178242, issued on Apr 9, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Mark Williams, MBBS located?
The NPPES record lists a practice address at University OF Rochester Medical Ctr, Rochester, NY, 14642. Phone: (585) 275-1384. Providers update this record themselves, so call before visiting.
How can I verify Mark Williams, MBBS's license?
NPPES lists New York license number 286923, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Williams, MBBS prescribe under Medicare Part D?
In 2024, Mark Williams, MBBS had 38 Medicare Part D claims for 25 beneficiaries; the average among anesthesiology physician prescribers was 402. Part D covers Medicare prescriptions only.
What is Mark Williams, MBBS's MIPS final score?
The 2023 MIPS final score is 74.4 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.