AARON FRANCIS FIELDS MD
NPI 1518300110
Emergency Medicine in Canandaigua, NY
About Aaron Francis Fields Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
AARON FRANCIS FIELDS MD (NPI 1518300110) is an individual emergency medicine provider in Canandaigua, New York, licensed in New York (283786) and active in the NPI registry since April 2013. He is enrolled in Medicare PECOS, is affiliated with F F Thompson Hospital, and is a graduate of Other (2013).
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
Aaron Francis Fields 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 Reassignments
8Medicare enrollment records show Aaron Fields reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Canandaigua, NY 14424
- Reassigned Medicare billing, New York enrollment
- 347 clinicians in this Medicare group
Rochester, NY 14623
- Reassigned Medicare billing, New York enrollment
- 112 clinicians in this Medicare group
Rochester, NY 14642
- Reassigned Medicare billing, New York enrollment
- 1,624 clinicians in this Medicare group
Rochester, NY 14642
- Reassigned Medicare billing, New York enrollment
- 7 clinicians in this Medicare group
Rochester, NY 14642
- Reassigned Medicare billing, New York enrollment
- 197 clinicians in this Medicare group
Rochester, NY 14642
- Reassigned Medicare billing, New York enrollment
- 124 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
F F Thompson Hospital
Acute Care Hospitals · Canandaigua, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 14424 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 Aaron Fields's NPI number?
The NPI number for Aaron Fields is 1518300110. It was assigned to this individual provider in the NPPES registry on April 12, 2013.
Where is Aaron Fields located?
Aaron Fields practices at 350 Parrish St, Canandaigua, NY 14424. The listed phone number is (585) 396-6150.
What is Aaron Fields's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Aaron Fields enrolled in Medicare?
Yes. Aaron Fields 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 Fields's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Fields reassigns Medicare benefits to 8 organizations: The Frederick Ferris Thompson Hospital (Canandaigua, NY), University Of Rochester Urgent Care (Rochester, NY), University Of Rochester (Rochester, NY), University Of Rochester Emergency Associates Toxicology Group (Rochester, NY), Emergency Associates - University Of Rochester (Rochester, NY) and 3 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 Aaron Fields's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Aaron Fields affiliated with any hospitals?
According to CMS data, Aaron Fields is affiliated with F F Thompson Hospital.
When was this NPI record last updated?
The NPPES record for Aaron Fields was last updated on January 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Aaron Francis Fields, MD · NPI 1518300110
Emergency Medicine physician in Canandaigua, New York. Individual provider, active in the CMS NPPES registry since April 12, 2013.
## Identity
- **NPI:** 1518300110 (Entity type: Individual)
- **Enumerated:** April 12, 2013
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 283786 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 350 PARRISH ST, Canandaigua, NY 14424-1731
- **Phone:** (585) 396-6150
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): The Frederick Ferris Thompson Hospital (NPI 1194776351, Canandaigua, NY); University Of Rochester Urgent Care (NPI 1700260395, Rochester, NY); University Of Rochester (NPI 1346285657, Rochester, NY); University Of Rochester Emergency Associates Toxicology Group (NPI 1861702334, Rochester, NY); Emergency Associates - University Of Rochester (NPI 1346281268, Rochester, NY); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** January 5, 2026
- **Other identifiers:** Medicaid 04505455 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1518300110) · Data from the CMS NPPES public registry.