GERALDINE CALLAHAN NP
NPI 1669865473
Nurse Practitioner in Nashua, NH
About Geraldine Callahan Np NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GERALDINE CALLAHAN NP (NPI 1669865473) is an individual nurse practitioner in Nashua, New Hampshire, licensed in Massachusetts (204352) and active in the NPI registry since March 2015. She is enrolled in Medicare PECOS and is a graduate of Other (1991).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Geraldine Callahan Np is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Geraldine Callahan reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Nashua, NH 03060
- Reassigned Medicare billing, New Hampshire enrollment
- 19 clinicians in this Medicare group
Derry, NH 03038
- Reassigned Medicare billing, New Hampshire enrollment
- 35 clinicians in this Medicare group
Gardner, MA 01440
- Reassigned Medicare billing, Massachusetts enrollment
- 344 clinicians in this Medicare group
Taunton, MA 02780
- Reassigned Medicare billing, Massachusetts enrollment
- 689 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 03060 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 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NASHUA, NH 03060
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 Geraldine Callahan's NPI number?
The NPI number for Geraldine Callahan is 1669865473. It was assigned to this individual provider in the NPPES registry on March 18, 2015. The provider is also known as Geraldine Callahan Np.
Where is Geraldine Callahan located?
Geraldine Callahan practices at 39 Simon St Ste 5, Nashua, NH 03060. The listed phone number is (603) 889-8648.
What is Geraldine Callahan's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Geraldine Callahan enrolled in Medicare?
Yes. Geraldine Callahan is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Geraldine Callahan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Geraldine Callahan reassigns Medicare benefits to 4 organizations: Lamora Psychological Associates, P.A. (Nashua, NH), Mental Health Center For Southern New Hampshire Inc (Derry, NH), Henry Heywood Memorial Hospital (Gardner, MA) and Northeast Health Services, LLC (Taunton, MA). 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 Geraldine Callahan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Geraldine Callahan accept?
Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Geraldine Callahan 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 Geraldine Callahan was last updated on May 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Geraldine Callahan, NP · NPI 1669865473
Nurse Practitioner physician in Nashua, New Hampshire. Individual provider, active in the CMS NPPES registry since March 18, 2015.
## Identity
- **NPI:** 1669865473 (Entity type: Individual)
- **Enumerated:** March 18, 2015
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 204352 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 39 SIMON ST STE 5, Nashua, NH 03060-3045
- **Phone:** (603) 889-8648
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Lamora Psychological Associates, P.A. (NPI 1407876253, Nashua, NH); Mental Health Center For Southern New Hampshire Inc (NPI 1003914466, Derry, NH); Henry Heywood Memorial Hospital (NPI 1205448701, Gardner, MA); Northeast Health Services, LLC (NPI 1225067481, Taunton, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1991
## Record status
- **NPPES last updated:** May 15, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1669865473) · Data from the CMS NPPES public registry.