William Mak, D.O.
Pediatric Emergency Medicine (Pediatrics) Physician · Stony Brook, NY
William Mak, D.O. is a pediatric emergency medicine (pediatrics) physician with a practice address in Stony Brook, New York, and NPI 1811256258, issued on May 4, 2012. Check the license (New York 279661, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- William Mak
- Credential
- D.O.
- Primary taxonomy
- Pediatric Emergency Medicine (Pediatrics) Physician 2080P0204X
- License number
- 279661 NY
Self-reported in NPPES; status is on the state search - Practice location
- Suny AT Stony Brook Department OF Pediatrics, Stony Brook, NY 11794
- Phone
- (631) 444-2020
- Enumerated
- May 4, 2012
- Record last updated
- Mar 6, 2025
- Fax
- (631) 444-2894
- Medicare enrollment
- Enrolled (PECOS I20250624003167); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest pediatric emergency medicine (pediatrics) physician records → All 261 in New York → Look up another NPI →
Verify William Mak 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 279661Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The MIPS final score for 2023 (Medicare payment program): 91.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
William Mak among 261 pediatric emergency medicine (pediatrics) physician records in New York
William Mak, D.O. is one of 261 pediatric emergency medicine (pediatrics) physician records with a practice address in New York. 28% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 70% of them.
- NPI issued2012 · 70% of these records are older, 26% newer
- In a Medicare fileYes · 28% of these records are
- In the CMS Doctors and Clinicians fileYes · 15% of these records are
- Graduated2012 · median 2010 among the 38 with a school on file
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0204X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Emergency Medicine (Pediatrics) Physician providers in New York
There are 261 pediatric emergency medicine (pediatrics) physician records in New York.
All 261 in New York → Every provider in Stony Brook → Pediatric Emergency Medicine (Pediatrics) Physician nationwide →
The 8 pediatric emergency medicine (pediatrics) physician records with the nearest ZIP codes
- Richard Bruckner, M.D.Stony Brook, NY 117941417124264
- Kathleen Doobinin, MDStony Brook, NY 117941043231939
- Caitlin Feeks, D.O.Stony Brook, NY 117941912264060
- Devin Grossman, M.D.Stony Brook, NY 117941588708887
- Carl Kaplan, MDStony Brook, NY 117941962515825
- Jessica Miller Mantell, D.OStony Brook, NY 117941689051401
- Ryan Paranal, MDStony Brook, NY 117941336671163
- Prina Patel, M.DStony Brook, NY 117941922369479
Common questions
What is William Mak, D.O.'s NPI number?
William Mak, D.O.'s National Provider Identifier (NPI) is 1811256258, issued on May 4, 2012. An NPI identifies a provider in billing; it is not a license.
Where is William Mak, D.O. located?
The NPPES record lists a practice address at Suny AT Stony Brook Department OF Pediatrics, Stony Brook, NY, 11794. Phone: (631) 444-2020. Providers update this record themselves, so call before visiting.
How can I verify William Mak, D.O.'s license?
NPPES lists New York license number 279661, 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.
What is William Mak, D.O.'s MIPS final score?
The 2023 MIPS final score is 91.3 of 100. 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.