Gregory Mark McWilliams, MD
Internal Medicine Physician · New York, NY
Gregory Mark McWilliams, MD is an internal medicine physician with a practice address in New York, New York, and NPI 1710418512, issued on Mar 23, 2017. Check the license (New York 301713, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Gregory Mark McWilliams
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 301713 NY
Self-reported in NPPES; status is on the state search - Practice location
- 215 E 85TH St, New York, NY 10028
- Phone
- (646) 962-7300
- Enumerated
- Mar 23, 2017
- Record last updated
- Jul 3, 2023
- Fax
- (646) 962-0409
- Medicare enrollment
- Enrolled (PECOS I20201021003105); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 2017
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
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Also registered at 215 E 85TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Mark McWilliams 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 301713Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,406 Medicare Part D claims for 161 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium186 claims
- Amlodipine Besylate70 claims
- Rosuvastatin Calcium58 claims
- Levothyroxine Sodium42 claims
- Eliquis39 claims
- Pantoprazole Sodium39 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 MIPS final score for 2023 (Medicare payment program): 100 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).
Bills Medicare through one group practice
- Weill Medical College OF CornellNew York, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Mark McWilliams among 12,067 internal medicine physician records in New York
Gregory Mark McWilliams, MD is one of 12,067 internal medicine physician records with a practice address in New York. 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 2017, is newer than 80% of them.
- NPI issued2017 · 80% of these records are older, 18% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2017 · median 2002 among the 7,221 with a school on file
- Record last updated2023 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,434 internal medicine physician records list a practice address in New York
They are 2,434 of the 98,468 NPPES records with a practice address in New York, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in New York → Internal Medicine Physician nationwide →
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Common questions
What is Gregory Mark McWilliams, MD's NPI number?
Gregory Mark McWilliams, MD's National Provider Identifier (NPI) is 1710418512, issued on Mar 23, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Mark McWilliams, MD located?
The NPPES record lists a practice address at 215 E 85TH St, New York, NY, 10028. Phone: (646) 962-7300. Providers update this record themselves, so call before visiting.
How can I verify Gregory Mark McWilliams, MD's license?
NPPES lists New York license number 301713, 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 Gregory Mark McWilliams, MD prescribe under Medicare Part D?
In 2024, Gregory Mark McWilliams, MD had 1,406 Medicare Part D claims for 161 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Gregory Mark McWilliams, MD's MIPS final score?
The 2023 MIPS final score is 100 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.