WILLIAM H STILWELL FNP
NPI 1407102734
Nurse Practitioner - Family in Oswego, NY
About William H Stilwell Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM H STILWELL FNP (NPI 1407102734) is an individual family provider in Oswego, New York, licensed in New York (337400) and active in the NPI registry since July 2012. He is enrolled in Medicare PECOS, is affiliated with Oswego Hospital, and is a graduate of Other (2012).
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 H Stilwell Fnp 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
3Medicare enrollment records show William Stilwell reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oswego, NY 13126
- Reassigned Medicare billing, New York enrollment
- 70 clinicians in this Medicare group
Oswego, NY 13126
- Reassigned Medicare billing, New York enrollment
- 129 clinicians in this Medicare group
Liverpool, NY 13090
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Wellnow Urgent Care, P.C.
- 511 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 8
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.
Oswego Hospital
Acute Care Hospitals · Oswego, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 13126 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Stilwell's NPI number?
The NPI number for William Stilwell is 1407102734. It was assigned to this individual provider in the NPPES registry on July 24, 2012.
Where is William Stilwell located?
William Stilwell practices at 110 W 6th St, Oswego, NY 13126. The listed phone number is (315) 349-5752.
What is William Stilwell's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is William Stilwell enrolled in Medicare?
Yes. William Stilwell 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 Stilwell's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Stilwell reassigns Medicare benefits to 3 organizations: Physician Care PC (Oswego, NY), Port City Emergency Physicians LLP (Oswego, NY) and Wellnow Urgent Care, PC (Liverpool, 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 Stilwell's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Stilwell affiliated with any hospitals?
According to CMS data, William Stilwell is affiliated with Oswego Hospital.
When was this NPI record last updated?
The NPPES record for William Stilwell was last updated on March 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# William H Stilwell, FNP · NPI 1407102734
Family physician in Oswego, New York. Individual provider, active in the CMS NPPES registry since July 24, 2012.
## Identity
- **NPI:** 1407102734 (Entity type: Individual)
- **Enumerated:** July 24, 2012
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 337400 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 110 W 6TH ST, Oswego, NY 13126-2507
- **Phone:** (315) 349-5752 · **Fax:** (315) 349-5769
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Physician Care PC (NPI 1073868113, Oswego, NY); Port City Emergency Physicians LLP (NPI 1134370547, Oswego, NY); Wellnow Urgent Care, PC (NPI 1669825162, Liverpool, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** March 11, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1407102734) · Data from the CMS NPPES public registry.