SPIROS MITSOPOULOS, MD, PLLC
NPI 1891130845
Internal Medicine in Manchester, NH
About Spiros Mitsopoulos, Md, Pllc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SPIROS MITSOPOULOS, MD, PLLC (NPI 1891130845) is a healthcare organization registered as an internal medicine in Manchester, New Hampshire and active in the NPI registry since May 2013. The organization lists Spiros Mitsopoulos, Physician Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Spiros Mitsopoulos, Md, Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Spiros Mitsopoulos, MD, PLLC, which bills Medicare for the services this clinician delivers.
Clinician (1)
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 Spiros Mitsopoulos, MD, PLLC's NPI number?
The NPI number for Spiros Mitsopoulos, MD, PLLC is 1891130845. It was assigned to this organization in the NPPES registry on May 3, 2013.
Where is Spiros Mitsopoulos, MD, PLLC located?
Spiros Mitsopoulos, MD, PLLC is located at 445 Cypress St Unit 9, Manchester, NH 03103. The listed phone number is (603) 663-8230.
What is Spiros Mitsopoulos, MD, PLLC's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Spiros Mitsopoulos, MD, PLLC enrolled in Medicare?
Yes. Spiros Mitsopoulos, MD, PLLC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Spiros Mitsopoulos, MD, PLLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Spiros Mitsopoulos, MD, PLLC. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Spiros Mitsopoulos, MD, PLLC was last updated on September 24, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Spiros Mitsopoulos, Md, Pllc · NPI 1891130845
Internal Medicine organization in Manchester, New Hampshire. Organization record, active in the CMS NPPES registry since May 3, 2013.
## Identity
- **NPI:** 1891130845 (Entity type: Organization)
- **Enumerated:** May 3, 2013
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **Organization subpart:** No
- **Authorized official:** Spiros Mitsopoulos, PHYSICIAN OWNER
## Practice location
- **Address:** 445 CYPRESS ST, UNIT 9, Manchester, NH 03103-3600
- **Phone:** (603) 663-8230 · **Fax:** (603) 663-8239
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Internal Medicine) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** September 24, 2014
- **Other identifiers:** Medicare UPIN B86181 (NH)
---
Source: [NPI Profile](https://npiprofile.com/npi/1891130845) · Data from the CMS NPPES public registry.