DR. WILLIAM TERRIN MD
NPI 1154718476
Emergency Medicine in Brooklyn, NY
About Dr. William Terrin Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM TERRIN MD (NPI 1154718476) is an individual emergency medicine provider in Brooklyn, New York, licensed in New York (287158) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, is affiliated with Montefiore Medical Center, and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses 2
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
Dr. William Terrin 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 Reassignments
4Medicare enrollment records show William Terrin reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Brooklyn, NY 11203
- Reassigned Medicare billing, New York enrollment
- 63 clinicians in this Medicare group
Bronx, NY 10461
- Reassigned Medicare billing, New York enrollment
- 244 clinicians in this Medicare group
Far Rockaway, NY 11691
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Island Emergency Medical Services PC
- 290 clinicians in this Medicare group
Oceanside, NY 11572
- Reassigned Medicare billing, New York enrollment
- 52 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 3
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Montefiore Medical Center
Acute Care Hospitals · Bronx, NYMount Sinai South Nassau
Acute Care Hospitals · Oceanside, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11201 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.
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.
BROOKLYN, NY 11201
BROOKLYN, NY 11201
BROOKLYN, NY 11201
BROOKLYN, NY 11201
BROOKLYN, NY 11201
BROOKLYN, NY 11201
BROOKLYN, NY 11201
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 Terrin's NPI number?
The NPI number for William Terrin is 1154718476. It was assigned to this individual provider in the NPPES registry on April 24, 2015.
Where is William Terrin located?
William Terrin practices at 121 Dekalb Ave, Brooklyn, NY 11201. The listed phone number is (718) 250-8369.
What is William Terrin's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is William Terrin enrolled in Medicare?
Yes. William Terrin 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 organizations bill Medicare for William Terrin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Terrin reassigns Medicare benefits to 4 organizations: University Hospital Of Brooklyn Suny Downstate Health Sciences Univers (Brooklyn, NY), Hospitalist Medicine Physicians Of New York, PLLC (Bronx, NY), Island Emergency Medical Services, P.C. (Far Rockaway, NY) and South Nassau Physician Group PC (Oceanside, NY). 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 Terrin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Terrin affiliated with any hospitals?
According to CMS data, William Terrin is affiliated with Montefiore Medical Center and Mount Sinai South Nassau.
When was this NPI record last updated?
The NPPES record for William Terrin was last updated on July 20, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Dr. William Terrin, MD · NPI 1154718476
Emergency Medicine physician in Brooklyn, New York. Individual provider, active in the CMS NPPES registry since April 24, 2015.
## Identity
- **NPI:** 1154718476 (Entity type: Individual)
- **Enumerated:** April 24, 2015
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 287158 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 121 DEKALB AVE, Brooklyn, NY 11201-5425
- **Phone:** (718) 250-8369 · **Fax:** (718) 250-6528
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): University Hospital Of Brooklyn Suny Downstate Health Sciences Univers (NPI 1740853340, Brooklyn, NY); Hospitalist Medicine Physicians Of New York, PLLC (NPI 1205944329, Bronx, NY); Island Emergency Medical Services, P.C. (NPI 1639160385, Far Rockaway, NY); South Nassau Physician Group PC (NPI 1922460542, Oceanside, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** July 20, 2017
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Source: [NPI Profile](https://npiprofile.com/npi/1154718476) · Data from the CMS NPPES public registry.