THERESA CALLAHAN M.D.
NPI 1861480931
Pediatrics in Leominster, MA
About Theresa Callahan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THERESA CALLAHAN M.D. (NPI 1861480931) is an individual pediatrics provider in Leominster, Massachusetts, licensed in Massachusetts (80890) and active in the NPI registry since October 2005. She is enrolled in Medicare PECOS and is a graduate of University Of Massachusetts Medical School (1991).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Accepted Insurance
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
Theresa Callahan M.d. 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 Theresa Callahan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Leominster, MA 01453
- Reassigned Medicare billing, Massachusetts enrollment
- 7 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01453 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.
LEOMINSTER, MA 01453
LEOMINSTER, MA 01453
LEOMINSTER, MA 01453
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 Theresa Callahan's NPI number?
The NPI number for Theresa Callahan is 1861480931. It was assigned to this individual provider in the NPPES registry on October 12, 2005.
Where is Theresa Callahan located?
Theresa Callahan practices at 100 Hospital Rd Suite 4, Leominster, MA 01453. The listed phone number is (978) 514-6300.
What is Theresa Callahan's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Theresa Callahan enrolled in Medicare?
Yes. Theresa Callahan 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 Theresa Callahan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Theresa Callahan reassigns Medicare benefits to Medical Associates Pediatrics, P.C. (Leominster, MA). 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 Theresa Callahan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Theresa Callahan accept?
Health plans from Ambetter from NH Healthy Families, Anthem Blue Cross and Blue Shield and Taro Health list Theresa 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 Theresa Callahan was last updated on June 24, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Theresa Callahan, M.D. · NPI 1861480931
Pediatrics physician in Leominster, Massachusetts. Individual provider, active in the CMS NPPES registry since October 12, 2005.
## Identity
- **NPI:** 1861480931 (Entity type: Individual)
- **Enumerated:** October 12, 2005
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 80890 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 HOSPITAL RD, SUITE 4, Leominster, MA 01453-2253
- **Phone:** (978) 514-6300 · **Fax:** (978) 514-6324
## 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:** Medical Associates Pediatrics, P.C. (NPI 1417946161, Leominster, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 1991
## Record status
- **NPPES last updated:** June 24, 2011
- **Other identifiers:** Medicare PIN A2028201 (MA); Medicaid 3141454 (MA); Medicare UPIN G07307 (MA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1861480931) · Data from the CMS NPPES public registry.