DR. JOAN HELENE MATHEWS MD
NPI 1942294855
Pediatrics in Cambridge, MA
About Dr. Joan Helene Mathews Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOAN HELENE MATHEWS MD (NPI 1942294855) is an individual pediatrics provider in Cambridge, Massachusetts, licensed in Massachusetts (41038) and active in the NPI registry since September 2005. She has opted out of Medicare through July 28, 2028 and remains eligible to order and refer.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Opted out of Medicare
Dr. Joan Helene Mathews Md has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from July 28, 2016 through July 28, 2028.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02138 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 11
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CAMBRIDGE, MA 02138
CAMBRIDGE, MA 02138
CAMBRIDGE, MA 02138
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 Joan Mathews's NPI number?
The NPI number for Joan Mathews is 1942294855. It was assigned to this individual provider in the NPPES registry on September 7, 2005.
Where is Joan Mathews located?
Joan Mathews practices at 777 Concord Ave Ste 105, Cambridge, MA 02138. The listed phone number is (617) 876-6800.
What is Joan Mathews's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Joan Mathews enrolled in Medicare?
No. Joan Mathews has opted out of Medicare through July 28, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.
When was this NPI record last updated?
The NPPES record for Joan Mathews was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Joan Helene Mathews, MD · NPI 1942294855
Pediatrics physician in Cambridge, Massachusetts. Individual provider, active in the CMS NPPES registry since September 7, 2005.
## Identity
- **NPI:** 1942294855 (Entity type: Individual)
- **Enumerated:** September 7, 2005
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 41038 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 777 CONCORD AVE, STE 105, Cambridge, MA 02138-1056
- **Phone:** (617) 876-6800 · **Fax:** (617) 876-5713
## Medicare
- **Medicare:** Opted out of Medicare (opt-out affidavit on file, in effect through July 28, 2028); services are provided under private contract
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Medicaid 0131032 (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1942294855) · Data from the CMS NPPES public registry.