MR. WILLIAM MICHAEL GASSMANN MS RN NPP
NPI 1033390885
Nurse Practitioner - Psychiatric/Mental Health in Clifton Springs, NY
About Mr. William Michael Gassmann Ms Rn Npp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. WILLIAM MICHAEL GASSMANN MS RN NPP (NPI 1033390885) is an individual psychiatric/mental health provider in Clifton Springs, New York, licensed in New York (401059) and active in the NPI registry since November 2007. He is enrolled in Medicare PECOS, is affiliated with Rochester General Hospital, and is a graduate of Other (2006).
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
Mr. William Michael Gassmann Ms Rn Npp 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
5Medicare enrollment records show William Gassmann reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Clifton Springs, NY 14432
- Reassigned Medicare billing, New York enrollment
- 872 clinicians in this Medicare group
Sodus, NY 14551
- Reassigned Medicare billing, New York enrollment
- 2,285 clinicians in this Medicare group
Rochester, NY 14620
- Reassigned Medicare billing, New York enrollment
- 1,624 clinicians in this Medicare group
Rochester, NY 14617
- Reassigned Medicare billing, New York enrollment
- 1,442 clinicians in this Medicare group
Rochester, NY 14621
- Reassigned Medicare billing, New York enrollment
- 78 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
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.
Rochester General Hospital
Acute Care Hospitals · Rochester, NYClifton Springs Hospital And Clinic
Acute Care Hospitals · Clifton Springs, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 14432 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.
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 Gassmann's NPI number?
The NPI number for William Gassmann is 1033390885. It was assigned to this individual provider in the NPPES registry on November 21, 2007.
Where is William Gassmann located?
William Gassmann practices at 2 Coulter Rd, Clifton Springs, NY 14432. The listed phone number is (315) 462-1050.
What is William Gassmann's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.
Is William Gassmann enrolled in Medicare?
Yes. William Gassmann 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 Gassmann's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Gassmann reassigns Medicare benefits to 5 organizations: Clifton Springs Sanitarium Co (Clifton Springs, NY), Rochester General Hospital (Sodus, NY), University Of Rochester (Rochester, NY), The Unity Hospital Of Rochester (Rochester, NY) and Behavioral Health Network, Inc. (Rochester, 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 Gassmann's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Gassmann affiliated with any hospitals?
According to CMS data, William Gassmann is affiliated with Rochester General Hospital and Clifton Springs Hospital And Clinic.
When was this NPI record last updated?
The NPPES record for William Gassmann was last updated on February 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.
# Mr. William Michael Gassmann, MS RN NPP · NPI 1033390885
Psychiatric/Mental Health physician in Clifton Springs, New York. Individual provider, active in the CMS NPPES registry since November 21, 2007.
## Identity
- **NPI:** 1033390885 (Entity type: Individual)
- **Enumerated:** November 21, 2007
- **Primary specialty:** Nurse Practitioner - Psychiatric/Mental Health · taxonomy 363LP0808X
- **State license:** 401059 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 2 COULTER RD, Clifton Springs, NY 14432-1122
- **Phone:** (315) 462-1050 · **Fax:** (315) 462-0145
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Clifton Springs Sanitarium Co (NPI 1366505463, Clifton Springs, NY); Rochester General Hospital (NPI 1821163718, Sodus, NY); University Of Rochester (NPI 1982787537, Rochester, NY); The Unity Hospital Of Rochester (NPI 1457395766, Rochester, NY); Behavioral Health Network, Inc. (NPI 1093812729, Rochester, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2006
## Record status
- **NPPES last updated:** February 19, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1033390885) · Data from the CMS NPPES public registry.