MARY BETH SON M.D.
NPI 1972665909
Pediatrics - Pediatric Rheumatology in Boston, MA
About Mary Beth Son M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY BETH SON M.D. (NPI 1972665909) is an individual pediatric rheumatology provider in Boston, Massachusetts, licensed in Massachusetts (219881) and active in the NPI registry since December 2006. She is enrolled in Medicare PECOS and is a graduate of University Of Massachusetts Medical School (2001).
NPPES Registry Identity
Specialties & Licenses
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
Mary Beth Son 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 Mary Beth Son 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
- 1,358 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.
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.
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 Mary Beth Son's NPI number?
The NPI number for Mary Beth Son is 1972665909. It was assigned to this individual provider in the NPPES registry on December 15, 2006.
Where is Mary Beth Son located?
Mary Beth Son practices at 300 Longwood Ave Childrens Hospital Boston, Boston, MA 02115. The listed phone number is (617) 355-6117.
What is Mary Beth Son's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Rheumatology, with taxonomy code 2080P0216X.
Is Mary Beth Son enrolled in Medicare?
Yes. Mary Beth Son 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 Mary Beth Son's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Beth Son reassigns Medicare benefits to Children's Hospital Pediatric Associates, 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 Mary Beth Son's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mary Beth Son was last updated on March 4, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Mary Beth Son, M.D. · NPI 1972665909
Pediatric Rheumatology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since December 15, 2006.
## Identity
- **NPI:** 1972665909 (Entity type: Individual)
- **Enumerated:** December 15, 2006
- **Primary specialty:** Pediatrics - Pediatric Rheumatology · taxonomy 2080P0216X
- **State license:** 219881 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, CHILDRENS HOSPITAL BOSTON, Boston, MA 02115-5724
- **Phone:** (617) 355-6117
## 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:** Children's Hospital Pediatric Associates, Inc (NPI 1457306664, Boston, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 2001
## Record status
- **NPPES last updated:** March 4, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1972665909) · Data from the CMS NPPES public registry.