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ALEX K WILLIAMSON M.D.
NPI 1659552438
Pathology - Anatomic Pathology & Clinical Pathology in New Hyde Park, NY

Active since November 20, 2007PECOS Enrolled
91.25/100
CMS Quality Rating
6 OHIO DR, SUITE #202, NEW HYDE PARK, NY 11042(516) 304-7265 Get Directions Write a Review

NPPES record last updated: March 25, 2016. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Alex K Williamson M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALEX K WILLIAMSON M.D. (NPI 1659552438) is an individual anatomic pathology & clinical pathology provider in New Hyde Park, New York, licensed in New York (2566821) and active in the NPI registry since November 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1659552438
Entity TypeIndividualMale
Primary Taxonomy207ZP0102X
Provider Legal NameALEX K WILLIAMSONCredential: M.D.
Location Address6 OHIO DR, SUITE #202New Hyde Park, NY 11042-1124
Mailing Address270-05 76th Ave, Lijmc Department Of Pathology, Room # B68New Hyde Park, NY 11042 · (718) 470-7490
Phone(516) 304-7265
Sole ProprietorNo
Enumeration DateNovember 20, 2007
Last NPPES UpdateMarch 25, 2016
✔ NPI 1659552438 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
License✔ Licensed in NY · 2566821
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
Also ListedPathology · Forensic PathologyTaxonomy 207ZF0201X · License 2566821 (NY)
Also ListedPathology · Pediatric PathologyTaxonomy 207ZP0213X · License 2566821 (NY)
6 OHIO DR, New Hyde Park, NY 11042
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Alex K Williamson M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Alex Williamson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

North Shore - Lij Medical PC
1.1 mi
Internal Medicine
270-05 76TH AVE
New Hyde Park, NY 11040
  • Reassigned Medicare billing, New York enrollment
  • 9,353 clinicians in this Medicare group
NPI 1790043479 (516) 465-8089

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11042 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$154.28 typical visit price
range $67.40 – $203.53
Typical copayment $38.57 (range $16.85 – $50.88)
Most-billed visit code 99204
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

91.25/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality74.92
Promoting Interoperability91.67
Improvement Activities40

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. NINA HAGHI M.D.
Pathology (Clinical Pathology)
6 OHIO DR, SUITE 202
NEW HYDE PARK, NY 11042
Nassau County (516) 304-7295
YONAH ZIEMBA MD
Student in an Organized Health Care Education/Training Program
6 OHIO DR
NEW HYDE PARK, NY 11042
Nassau County (516) 304-7221
LILI LEE MD
Pathology (Anatomic Pathology & Clinical Pathology)
6 OHIO DR, 202
NEW HYDE PARK, NY 11042
Nassau County (516) 304-7278
DR. LUKE MUELLER M.D., M.B.A.
Radiology (Diagnostic Radiology)
6 OHIO DR
NEW HYDE PARK, NY 11042
Nassau County (609) 731-0640
TAISIA VITKOVSKI D.O.
Pathology (Anatomic Pathology & Clinical Pathology)
6 OHIO DR, SUITE 202
NEW HYDE PARK, NY 11042
Nassau County (516) 304-7295
DR. DENISE JANUS RUTTGEIZER MD
Internal Medicine (Pulmonary Disease)
6 OHIO DR, NORTH SHORE PULMONARY ASSOCIATES, P.C. LSQ MEDICAL BUIL
LAKE SUCCESS, NY 11042
Nassau County (516) 328-8700
DR. STACEY SAILESH GANDHI M.D.
Radiology (Diagnostic Radiology)
6 OHIO DR, 1811
NEW HYDE PARK, NY 11042
Nassau County (516) 603-6097
DR. CHRISTOPHER MICHAEL FORESTO M.D.
Radiology (Diagnostic Radiology)
6 OHIO DR
NEW HYDE PARK, NY 11042
Nassau County (516) 684-4774

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Alex Williamson's NPI number?

The NPI number for Alex Williamson is 1659552438. It was assigned to this individual provider in the NPPES registry on November 20, 2007.

Where is Alex Williamson located?

Alex Williamson practices at 6 Ohio Dr Suite #202, New Hyde Park, NY 11042. The listed phone number is (516) 304-7265.

What is Alex Williamson's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Alex Williamson enrolled in Medicare?

Yes. Alex Williamson is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Alex Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alex Williamson reassigns Medicare benefits to North Shore - Lij Medical PC (New Hyde Park, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alex Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Alex Williamson was last updated on March 25, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.