DR. WILLIAM NEIL AMBROSINI M.D.
NPI 1881662898
Anesthesiology in Rochester, NY
About Dr. William Neil Ambrosini M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM NEIL AMBROSINI M.D. (NPI 1881662898) is an individual anesthesiology provider in Rochester, New York, licensed in New York (158785) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with St James Mercy Hospital, and is a graduate of Other (1983).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
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 Neil Ambrosini M.d. 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
9Medicare enrollment records show William Ambrosini reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rochester, NY 14642
- Reassigned Medicare billing, New York enrollment
- 458 clinicians in this Medicare group
Rochester, NY 14618
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Anesthesia Associates Of Rochester PC
- 142 clinicians in this Medicare group
Warsaw, NY 14569
- Reassigned Medicare billing, New York enrollment
- 25 clinicians in this Medicare group
Dansville, NY 14437
- Reassigned Medicare billing, New York enrollment
- 275 clinicians in this Medicare group
Hornell, NY 14843
- Reassigned Medicare billing, New York enrollment
- 436 clinicians in this Medicare group
Williamsville, NY 14221
- Reassigned Medicare billing, New York enrollment
- 29 clinicians in this Medicare group
Springville, NY 14141
- Reassigned Medicare billing, New York enrollment
- 25 clinicians in this Medicare group
Ithaca, NY 14850
- Reassigned Medicare billing, New York enrollment
- 328 clinicians in this Medicare group
Poughkeepsie, NY 12603
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Premier Medical Group Of The Hudson Valley PC
- 169 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 2
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St James Mercy Hospital
Acute Care Hospitals · Hornell, NYNicholas H Noyes Memorial Hospital
Acute Care Hospitals · Dansville, NYStrong Memorial Hospital
Acute Care Hospitals · Rochester, 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.
Other Providers at the Same Location NPPES 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ROCHESTER, NY 14618
ROCHESTER, NY 14618
ROCHESTER, NY 14618
ROCHESTER, NY 14618
ROCHESTER, NY 14618
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 Ambrosini's NPI number?
The NPI number for William Ambrosini is 1881662898. It was assigned to this individual provider in the NPPES registry on March 8, 2006.
Where is William Ambrosini located?
William Ambrosini practices at 1065 Senator Keating Blvd, Rochester, NY 14618. The listed phone number is (585) 256-1018.
What is William Ambrosini's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is William Ambrosini enrolled in Medicare?
Yes. William Ambrosini 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 Ambrosini's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Ambrosini reassigns Medicare benefits to 9 organizations: U Of R Anesthesiology Group (Rochester, NY), Anesthesia Associates Of Rochester, P.C. (Rochester, NY), Upstate New York Medical Professional Corporation (Warsaw, NY), Nicholas H. Noyes Memorial Hospital (Dansville, NY), St James Hospital (Hornell, NY) and 4 more organizations, listed in the Medicare section above. 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 Ambrosini's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Ambrosini affiliated with any hospitals?
According to CMS data, William Ambrosini is affiliated with St James Mercy Hospital, Nicholas H Noyes Memorial Hospital and Strong Memorial Hospital.
When was this NPI record last updated?
The NPPES record for William Ambrosini was last updated on March 17, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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 Neil Ambrosini, M.D. · NPI 1881662898
Anesthesiology physician in Rochester, New York. Individual provider, active in the CMS NPPES registry since March 8, 2006.
## Identity
- **NPI:** 1881662898 (Entity type: Individual)
- **Enumerated:** March 8, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 158785 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1065 SENATOR KEATING BLVD, Rochester, NY 14618-2673
- **Phone:** (585) 256-1018
## 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:** 9 organizations under Medicare reassignment (form CMS-855R): U Of R Anesthesiology Group (NPI 1609806488, Rochester, NY); Anesthesia Associates Of Rochester, P.C. (NPI 1760421788, Rochester, NY); Upstate New York Medical Professional Corporation (NPI 1801553128, Warsaw, NY); Nicholas H. Noyes Memorial Hospital (NPI 1982625661, Dansville, NY); St James Hospital (NPI 1013985399, Hornell, NY); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1983
## Record status
- **NPPES last updated:** March 17, 2020
- **Other identifiers:** Medicaid 010139270 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1881662898) · Data from the CMS NPPES public registry.