KAREN H COSTENBADER MD MPH
NPI 1447216825
Internal Medicine - Rheumatology in Boston, MA
About Karen H Costenbader Md Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAREN H COSTENBADER MD MPH (NPI 1447216825) is an individual rheumatology provider in Boston, Massachusetts, licensed in Massachusetts (208218) and active in the NPI registry since April 2006. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of Harvard Medical School (1995).
NPPES Registry Identity
Specialties & Licenses
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
Karen H Costenbader Md Mph 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 Karen Costenbader reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 4,574 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
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MABrigham And Women's Hospital
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02115 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 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 Karen Costenbader's NPI number?
The NPI number for Karen Costenbader is 1447216825. It was assigned to this individual provider in the NPPES registry on April 25, 2006.
Where is Karen Costenbader located?
Karen Costenbader practices at 45 Francis Street Brigham And Women's Hosp Robert B Brigham Arthritis Ctr, Boston, MA 02115. The listed phone number is (617) 732-5325.
What is Karen Costenbader's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Karen Costenbader enrolled in Medicare?
Yes. Karen Costenbader 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 Karen Costenbader's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Costenbader reassigns Medicare benefits to Brigham & Womens Physicians Organization Inc (Boston, 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 Karen Costenbader's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karen Costenbader accept?
Health plans from Taro Health list Karen Costenbader 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 Karen Costenbader affiliated with any hospitals?
According to CMS data, Karen Costenbader is affiliated with Massachusetts General Hospital and Brigham And Women's Hospital.
When was this NPI record last updated?
The NPPES record for Karen Costenbader was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Karen H Costenbader, MD MPH · NPI 1447216825
Rheumatology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 25, 2006.
## Identity
- **NPI:** 1447216825 (Entity type: Individual)
- **Enumerated:** April 25, 2006
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** 208218 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 45 FRANCIS STREET, BRIGHAM AND WOMEN'S HOSP ROBERT B BRIGHAM ARTHRITIS CTR, Boston, MA 02115
- **Phone:** (617) 732-5325
## 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:** Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1995
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1447216825) · Data from the CMS NPPES public registry.