MAINE MEDICAL SERVICES LLC
NPI 1053878371
Hospitalist in Ellsworth, ME
About Maine Medical Services Llc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAINE MEDICAL SERVICES LLC (NPI 1053878371) is a healthcare organization registered as a hospitalist in Ellsworth, Maine and active in the NPI registry since February 2019. The organization lists David J Istvan, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Maine Medical Services Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
128Medicare enrollment records show 128 clinicians reassign Medicare billing to Maine Medical Services LLC, which bills Medicare for the services they deliver. Of these, 6 practice at this address and 7 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 9
Nearest to this location (20)
See all 128Ellsworth, ME 04605
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Maine Medical Services LLC's NPI number?
The NPI number for Maine Medical Services LLC is 1053878371. It was assigned to this organization in the NPPES registry on February 22, 2019.
Where is Maine Medical Services LLC located?
Maine Medical Services LLC is located at 50 Union St, Ellsworth, ME 04605. The listed phone number is (865) 693-1000.
What is Maine Medical Services LLC's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Maine Medical Services LLC enrolled in Medicare?
Yes. Maine Medical Services LLC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Maine Medical Services LLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 128 clinicians in 9 Medicare specialties reassign their Medicare billing to Maine Medical Services LLC. A 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 the clinician's services. The largest specialties are Internal Medicine (79), Nurse Practitioner (17) and Family Practice (13). Of these, 6 practice at this address and 7 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Maine Medical Services LLC accept?
Health plans from Anthem Blue Cross and Blue Shield list Maine Medical Services LLC as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Maine Medical Services LLC was last updated on February 22, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Maine Medical Services Llc · NPI 1053878371
Hospitalist organization in Ellsworth, Maine. Organization record, active in the CMS NPPES registry since February 22, 2019.
## Identity
- **NPI:** 1053878371 (Entity type: Organization)
- **Enumerated:** February 22, 2019
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **Organization subpart:** No
- **Authorized official:** David Istvan, PRESIDENT
## Practice location
- **Address:** 50 UNION ST, Ellsworth, ME 04605-1534
- **Phone:** (865) 693-1000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 128 clinicians in 9 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Internal Medicine (79), Nurse Practitioner (17), Family Practice (13); 6 practice at this address and 7 within 10 miles; [full list](https://npiprofile.com/npi/1053878371/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 22, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1053878371) · Data from the CMS NPPES public registry.