WILLIAM A GILMARTIN MD
NPI 1457454670
Internal Medicine in Hampton Bays, NY
About William A Gilmartin Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM A GILMARTIN MD (NPI 1457454670) is an individual internal medicine provider in Hampton Bays, New York, licensed in New York (227116) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with Suny/stony Brook University Hospital, and is a graduate of Georgetown University School Of Medicine (1993).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
William A Gilmartin Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show William Gilmartin reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Southampton, NY 11968
- Reassigned Medicare billing, New York enrollment
- 134 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 10
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Suny/Stony Brook University Hospital
Acute Care Hospitals · Stony Brook, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11946 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HAMPTON BAYS, NY 11946
HAMPTON BAYS, NY 11946
HAMPTON BAYS, NY 11946
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 Gilmartin's NPI number?
The NPI number for William Gilmartin is 1457454670. It was assigned to this individual provider in the NPPES registry on September 6, 2006.
Where is William Gilmartin located?
William Gilmartin practices at 182 West Montauk Hwy Bldg B Suite H, Hampton Bays, NY 11946. The listed phone number is (631) 723-0022.
What is William Gilmartin's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is William Gilmartin enrolled in Medicare?
Yes. William Gilmartin is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for William Gilmartin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Gilmartin reassigns Medicare benefits to Meeting House Lane Medical Practice PC (Southampton, 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 William Gilmartin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Gilmartin affiliated with any hospitals?
According to CMS data, William Gilmartin is affiliated with Suny/Stony Brook University Hospital.
When was this NPI record last updated?
The NPPES record for William Gilmartin was last updated on April 15, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# William A Gilmartin, MD · NPI 1457454670
Internal Medicine physician in Hampton Bays, New York. Individual provider, active in the CMS NPPES registry since September 6, 2006.
## Identity
- **NPI:** 1457454670 (Entity type: Individual)
- **Enumerated:** September 6, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 227116 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 182 WEST MONTAUK HWY, BLDG B SUITE H, Hampton Bays, NY 11946
- **Phone:** (631) 723-0022
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Meeting House Lane Medical Practice PC (NPI 1902088495, Southampton, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Georgetown University School Of Medicine, class of 1993
## Record status
- **NPPES last updated:** April 15, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1457454670) · Data from the CMS NPPES public registry.