AARON WILLEN DO
NPI 1316352776
Emergency Medicine in Saratoga Springs, NY
About Aaron Willen Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
AARON WILLEN DO (NPI 1316352776) is an individual emergency medicine provider in Saratoga Springs, New York, licensed in New York (302721) and active in the NPI registry since June 2014. He is enrolled in Medicare PECOS, is affiliated with Samaritan Hospital Of Troy, New York, and maintains a secondary practice location in Kalamazoo.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 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
Aaron Willen Do 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 Aaron Willen reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saratoga Springs, NY 12866
- Reassigned Medicare billing, New York enrollment
- 456 clinicians in this Medicare group
Amsterdam, NY 12010
- Reassigned Medicare billing, New York enrollment
- 64 clinicians in this Medicare group
Amsterdam, NY 12010
- Reassigned Medicare billing, New York enrollment
- 65 clinicians in this Medicare group
Poughkeepsie, NY 12601
- Reassigned Medicare billing, New York enrollment
- 356 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Samaritan Hospital Of Troy, New York
Acute Care Hospitals · Troy, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 12866 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.
SARATOGA SPRINGS, NY 12866
SARATOGA SPRINGS, NY 12866
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 Aaron Willen's NPI number?
The NPI number for Aaron Willen is 1316352776. It was assigned to this individual provider in the NPPES registry on June 24, 2014.
Where is Aaron Willen located?
Aaron Willen practices at 211 Church St, Saratoga Springs, NY 12866. The listed phone number is (518) 886-5957.
What is Aaron Willen's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Aaron Willen enrolled in Medicare?
Yes. Aaron Willen 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 Aaron Willen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Willen reassigns Medicare benefits to 5 organizations: Saratoga Hospital (Saratoga Springs, NY), Upstate Ny Physician PLLC (Amsterdam, NY), Wajeeh Sana Physician PC (Amsterdam, NY), Emergency Physician Services Of New York, P.C. (Poughkeepsie, NY) and Island Emergency Medical Services, P.C. (Far Rockaway, 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 Aaron Willen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Aaron Willen affiliated with any hospitals?
According to CMS data, Aaron Willen is affiliated with Samaritan Hospital Of Troy, New York.
When was this NPI record last updated?
The NPPES record for Aaron Willen was last updated on May 16, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Aaron Willen, DO · NPI 1316352776
Emergency Medicine physician in Saratoga Springs, New York. Individual provider, active in the CMS NPPES registry since June 24, 2014.
## Identity
- **NPI:** 1316352776 (Entity type: Individual)
- **Enumerated:** June 24, 2014
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 302721 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 211 CHURCH ST, Saratoga Springs, NY 12866-1003
- **Phone:** (518) 886-5957
## 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): Saratoga Hospital (NPI 1073569331, Saratoga Springs, NY); Upstate Ny Physician PLLC (NPI 1487484523, Amsterdam, NY); Wajeeh Sana Physician PC (NPI 1700643830, Amsterdam, NY); Emergency Physician Services Of New York, P.C. (NPI 1093759847, Poughkeepsie, NY); Island Emergency Medical Services, P.C. (NPI 1639160385, Far Rockaway, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Philadelphia College Of Osteopathic Medicine, class of 2014
## Record status
- **NPPES last updated:** May 16, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1316352776) · Data from the CMS NPPES public registry.