LIONEL WILLIAMS JR. MD
NPI 1285631994
Anesthesiology in Poughkeepsie, NY
About Lionel Williams Jr. Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LIONEL WILLIAMS JR. MD (NPI 1285631994) is an individual anesthesiology provider in Poughkeepsie, New York, licensed in New York (180410) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS, is affiliated with Vassar Brothers Medical Center, and is a graduate of State University Of New York At Buffalo School Of Medicine (1988).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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
Lionel Williams Jr. 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 Lionel Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Melville, NY 11747
- Reassigned Medicare billing, New York enrollment
- 508 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 15
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.
Vassar Brothers Medical Center
Acute Care Hospitals · Poughkeepsie, NYMedicare 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.
Reported Quality Measures
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.
POUGHKEEPSIE, NY 12601
POUGHKEEPSIE, NY 12601
POUGHKEEPSIE, NY 12601
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 Lionel Williams's NPI number?
The NPI number for Lionel Williams is 1285631994. It was assigned to this individual provider in the NPPES registry on July 7, 2005.
Where is Lionel Williams located?
Lionel Williams practices at 45 Reade Pl Anesthesia Department, Poughkeepsie, NY 12601. The listed phone number is (845) 431-5629.
What is Lionel Williams's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Lionel Williams enrolled in Medicare?
Yes. Lionel Williams 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 Lionel Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lionel Williams reassigns Medicare benefits to North American Partners In Anesthesia LLP (Melville, 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 Lionel Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Lionel Williams affiliated with any hospitals?
According to CMS data, Lionel Williams is affiliated with Vassar Brothers Medical Center.
When was this NPI record last updated?
The NPPES record for Lionel Williams was last updated on November 4, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Lionel Williams Jr., MD · NPI 1285631994
Anesthesiology physician in Poughkeepsie, New York. Individual provider, active in the CMS NPPES registry since July 7, 2005.
## Identity
- **NPI:** 1285631994 (Entity type: Individual)
- **Enumerated:** July 7, 2005
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 180410 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 45 READE PL, ANESTHESIA DEPARTMENT, Poughkeepsie, NY 12601-3947
- **Phone:** (845) 431-5629
## 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:** North American Partners In Anesthesia LLP (NPI 1649264706, Melville, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York At Buffalo School Of Medicine, class of 1988
## Record status
- **NPPES last updated:** November 4, 2009
- **Other identifiers:** Medicare ID-Type Unspecified 99B981 (NY); Medicare UPIN F77875 (NY); Medicaid 01901660 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1285631994) · Data from the CMS NPPES public registry.