Mark Williams, MD
Emergency Medicine Physician · Northport, NY
Mark Williams, MD is an emergency medicine physician with a practice address in Northport, New York, and NPI 1275645806, issued on Aug 31, 2006. Check the license (New York 178086, 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
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 178086 NY
Self-reported in NPPES; status is on the state search - Practice location
- 79 Middleville RD, Northport, NY 11768
- Phone
- (631) 261-4400
- Enumerated
- Aug 31, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 5,025 in New York → Look up another NPI →
Also registered at 79 Middleville RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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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 178086Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average emergency medicine physician in 2024
15 Medicare Part D claims, against an average of 226 among the 54,106 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.
Mark Williams among 5,025 emergency medicine physician records in New York
Mark Williams, MD is one of 5,025 emergency medicine physician records with a practice address in New York. 86% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 72% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2007 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in New York
There are 5,025 emergency medicine physician records in New York.
All 5,025 in New York → Every provider in Northport → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Lindsey Schuster, DOMount Sinai, NY 117661003022823
- Joy Harrison, M.D.Oyster Bay, NY 117711366432486
- Joshua Ardise, MDPatchogue, NY 117721841242922
- Natalie Digioia, MDPatchogue, NY 117721306889043
- Robert Ehlers, DOPatchogue, NY 117721285677583
- Carl Goodman, DOPatchogue, NY 117721205889847
- Margaret Macleod, DOPatchogue, NY 117721225101835
- Andrew Mapley, D.O.Patchogue, NY 117721154589380
Common questions
What is Mark Williams, MD's NPI number?
Mark Williams, MD's National Provider Identifier (NPI) is 1275645806, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Williams, MD located?
The NPPES record lists a practice address at 79 Middleville RD, Northport, NY, 11768. Phone: (631) 261-4400. Providers update this record themselves, so call before visiting.
How can I verify Mark Williams, MD's license?
NPPES lists New York license number 178086, 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, MD prescribe under Medicare Part D?
In 2024, Mark Williams, MD had 15 Medicare Part D claims; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
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.