KAREN C NANJI M.D.
NPI 1902036346
Anesthesiology in Boston, MA
About Karen C Nanji M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAREN C NANJI M.D. (NPI 1902036346) is an individual anesthesiology provider in Boston, Massachusetts, licensed in Massachusetts (L-239895) and active in the NPI registry since July 2009. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of Other (2006).
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 C Nanji 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 Reassignments
2Medicare enrollment records show Karen Nanji reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
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 Nanji's NPI number?
The NPI number for Karen Nanji is 1902036346. It was assigned to this individual provider in the NPPES registry on July 20, 2009.
Where is Karen Nanji located?
Karen Nanji practices at Massachusetts General Hospital 55 Fruit Street, Boston, MA 02114. The listed phone number is (617) 726-3030.
What is Karen Nanji's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Karen Nanji enrolled in Medicare?
Yes. Karen Nanji 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 organizations bill Medicare for Karen Nanji's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Nanji reassigns Medicare benefits to 2 organizations: The General Hospital Corporation (Boston, MA) and Massachusetts General Physicians Organization Inc (Boston, 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 Karen Nanji's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karen Nanji accept?
Health plans from Taro Health list Karen Nanji 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 Nanji affiliated with any hospitals?
According to CMS data, Karen Nanji is affiliated with Massachusetts General Hospital.
When was this NPI record last updated?
The NPPES record for Karen Nanji was last updated on February 9, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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 C Nanji, M.D. · NPI 1902036346
Anesthesiology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since July 20, 2009.
## Identity
- **NPI:** 1902036346 (Entity type: Individual)
- **Enumerated:** July 20, 2009
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** L-239895 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET, Boston, MA 02114
- **Phone:** (617) 726-3030
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): The General Hospital Corporation (NPI 1023049236, Boston, MA); Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2006
## Record status
- **NPPES last updated:** February 9, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1902036346) · Data from the CMS NPPES public registry.