CASEY CALLAHAN MD
NPI 1225657919
Family Medicine in Somerville, MA
About Casey Callahan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CASEY CALLAHAN MD (NPI 1225657919) is an individual family medicine provider in Somerville, Massachusetts, licensed in Massachusetts (1015482) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS, is affiliated with Cambridge Health Alliance, and maintains a secondary practice location in Stoneham.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 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 and accepts Medicare assignment
Casey Callahan Md 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 Casey Callahan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Cambridge, MA 02139
- Reassigned Medicare billing, Massachusetts enrollment
- 719 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Cambridge Health Alliance
Acute Care Hospitals · Cambridge, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02145 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
SOMERVILLE, MA 02145
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 Casey Callahan's NPI number?
The NPI number for Casey Callahan is 1225657919. It was assigned to this individual provider in the NPPES registry on April 13, 2020.
Where is Casey Callahan located?
Casey Callahan practices at 300 Broadway, Somerville, MA 02145. The listed phone number is (617) 284-7000.
What is Casey Callahan's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Casey Callahan enrolled in Medicare?
Yes. Casey 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 Casey Callahan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Casey Callahan reassigns Medicare benefits to Cambridge Public Health Commission (Cambridge, 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 Casey Callahan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Casey Callahan accept?
Health plans from Taro Health list Casey 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.
Is Casey Callahan affiliated with any hospitals?
According to CMS data, Casey Callahan is affiliated with Cambridge Health Alliance.
When was this NPI record last updated?
The NPPES record for Casey Callahan was last updated on August 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Casey Callahan, MD · NPI 1225657919
Family Medicine physician in Somerville, Massachusetts. Individual provider, active in the CMS NPPES registry since April 13, 2020.
## Identity
- **NPI:** 1225657919 (Entity type: Individual)
- **Enumerated:** April 13, 2020
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 1015482 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 300 BROADWAY, Somerville, MA 02145-2935
- **Phone:** (617) 284-7000
## 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:** Cambridge Public Health Commission (NPI 1932313228, Cambridge, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Jefferson Medical College Of Thomas Jefferson University, class of 2020
## Record status
- **NPPES last updated:** August 18, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1225657919) · Data from the CMS NPPES public registry.