ARI HIRSHFELD
NPI 1881154268
Hospitalist in Ellsworth, ME
About Ari Hirshfeld NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ARI HIRSHFELD (NPI 1881154268) is an individual hospitalist provider in Ellsworth, Maine, licensed in Maine (MD26639) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with Hackensack University Medical Center, and is a graduate of Other (2019).
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
Ari Hirshfeld 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 Reassignment
Medicare enrollment records show Ari Hirshfeld reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Montclair, NJ 07042
- Reassigned Medicare billing, New Jersey enrollment
- 252 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.
Hackensack University Medical Center
Acute Care Hospitals · Hackensack, NJPalisades Medical Center
Acute Care Hospitals · North Bergen, NJPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 04605 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 Ari Hirshfeld's NPI number?
The NPI number for Ari Hirshfeld is 1881154268. It was assigned to this individual provider in the NPPES registry on March 22, 2019.
Where is Ari Hirshfeld located?
Ari Hirshfeld practices at 50 Union St, Ellsworth, ME 04605. The listed phone number is (207) 664-5311.
What is Ari Hirshfeld's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Ari Hirshfeld enrolled in Medicare?
Yes. Ari Hirshfeld 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 organization bills Medicare for Ari Hirshfeld's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ari Hirshfeld reassigns Medicare benefits to Plover Inpatient Services LLC (Montclair, NJ). The 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 Ari Hirshfeld's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Ari Hirshfeld affiliated with any hospitals?
According to CMS data, Ari Hirshfeld is affiliated with Hackensack University Medical Center and Palisades Medical Center.
When was this NPI record last updated?
The NPPES record for Ari Hirshfeld was last updated on May 19, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Ari Hirshfeld · NPI 1881154268
Hospitalist physician in Ellsworth, Maine. Individual provider, active in the CMS NPPES registry since March 22, 2019.
## Identity
- **NPI:** 1881154268 (Entity type: Individual)
- **Enumerated:** March 22, 2019
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** MD26639 (Maine)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 50 UNION ST, Ellsworth, ME 04605-1534
- **Phone:** (207) 664-5311
## 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:** Plover Inpatient Services LLC (NPI 1134534688, Montclair, NJ), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** May 19, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1881154268) · Data from the CMS NPPES public registry.