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WILLIAM MAK D.O.
NPI 1811256258
Pediatrics - Pediatric Emergency Medicine in Stony Brook, NY

Active since May 04, 2012PECOS Enrolled
91.25/100
CMS Quality Rating
SUNY AT STONY BROOK DEPARTMENT OF PEDIATRICS, HSC T-11 / 040, STONY BROOK, NY 11794(631) 444-2020(631) 444-2894 Get Directions Write a Review

NPPES record last updated: March 6, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 6, 2025, Sep 16, 2016 (2 updates tracked since 2016).

About William Mak D.o. NPPES

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

WILLIAM MAK D.O. (NPI 1811256258) is an individual pediatric emergency medicine provider in Stony Brook, New York, licensed in New York (279661) and active in the NPI registry since May 2012. He is enrolled in Medicare PECOS and maintains a secondary practice location in Rochester.

NPPES Registry Identity

NPI1811256258
Entity TypeIndividualMale
Primary Taxonomy2080P0204X
Provider Legal NameWILLIAM MAKCredential: D.O.
Location AddressSUNY AT STONY BROOK DEPARTMENT OF PEDIATRICS, HSC T-11 / 040Stony Brook, NY 11794-8111
Mailing AddressSuny At Stony Brook Department Of Pediatrics, Hsc T-11 / 040Stony Brook, NY 11794-8111 · (631) 444-2020 · Fax (631) 444-2894
Phone(631) 444-2020
Fax(631) 444-2894
Sole ProprietorNo
Enumeration DateMay 4, 2012
Last NPPES UpdateMarch 6, 20252 updates tracked since enumeration
NPPES CertifiedMarch 6, 2025
✔ NPI 1811256258 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatrics · Pediatric Emergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2080P0204X
License✔ Licensed in NY · 279661
Definition
A pediatrician who has special qualifications to manage emergencies in infants and children.
Also ListedPediatricsTaxonomy 208000000X · License 279661 (NY)
SUNY AT STONY BROOK DEPARTMENT OF PEDIATRICS, Stony Brook, NY 11794
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Secondary Practice Location 1

Location 11425 Portland AveRochester, NY 14621-3011 · Phone (585) 922-2000

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health Maintenance Organization of Florida.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Mak D.o. 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 Reassignments

5

Medicare enrollment records show William Mak reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

North Shore-Lij Medical PC
31 mi
Urology
1010 NORTHERN BLVD STE 110
Great Neck, NY 11021
  • Reassigned Medicare billing, New York enrollment
  • 9,353 clinicians in this Medicare group
NPI 1053688572 (516) 321-7400
Clifton Springs Sanitarium Co
249 mi
General Acute Care Hospital
2 COULTER RD
Clifton Springs, NY 14432
  • Reassigned Medicare billing, New York enrollment
  • 872 clinicians in this Medicare group
NPI 1366505463 (315) 462-9561
Newark Wayne Community Hospital
251 mi
General Acute Care Hospital
1200 DRIVING PARK AVE
Newark, NY 14513
  • Reassigned Medicare billing, New York enrollment
  • 679 clinicians in this Medicare group
NPI 1346369212 (315) 332-2022
Rochester General Hospital
258 mi
Internal Medicine
6692 MIDDLE RD
Sodus, NY 14551
  • Reassigned Medicare billing, New York enrollment
  • 2,285 clinicians in this Medicare group
NPI 1821163718 (315) 483-9135
Emergency Medicine Services Of Fl, LLC
1,106 mi
Emergency Medicine
20900 BISCAYNE BLVD
Aventura, FL 33180
  • Reassigned Medicare billing, Florida enrollment
  • 1,912 clinicians in this Medicare group
NPI 1043917180 (305) 682-7000

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

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

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 William Mak's NPI number?

The NPI number for William Mak is 1811256258. It was assigned to this individual provider in the NPPES registry on May 4, 2012.

Where is William Mak located?

William Mak practices at Suny At Stony Brook Department Of Pediatrics Hsc T-11 / 040, Stony Brook, NY 11794. The listed phone number is (631) 444-2020.

What is William Mak's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Emergency Medicine, with taxonomy code 2080P0204X.

Is William Mak enrolled in Medicare?

Yes. William Mak is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for William Mak's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Mak reassigns Medicare benefits to 5 organizations: North Shore-Lij Medical PC (Great Neck, NY), Clifton Springs Sanitarium Co (Clifton Springs, NY), Newark Wayne Community Hospital (Newark, NY), Rochester General Hospital (Sodus, NY) and Emergency Medicine Services Of Fl, LLC (Aventura, FL). Each 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 William Mak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Mak accept?

Health plans from Oscar Health Maintenance Organization of Florida list William Mak as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for William Mak was last updated on March 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months 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.