NPI registry status
Active
2026 NPPES data Pediatric Rheumatology Physician NPI 1972665909 M.D.
Verify on CMS → Mary Beth Son, M.D.
Pediatric Rheumatology Physician in Boston, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 394 in Pediatric Rheumatology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
35
Medicare Part D claims · Pediatric Rheumatology Physician avg: 200
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mary Beth Son, M.D. filed 35 Medicare Part D claims in 2023 as a Pediatric Rheumatology Physician in Boston, Massachusetts.
- 35
- Part D claims, 2023
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Mary Beth Son, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
35 0th percentile higher than 0% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Mary Beth Son, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mary Beth Son, M.D.?
Quality data not reportedPrimary specialty
Pediatric Rheumatology Physician
Medicare Part D claims
35 82% vs specialty avg
Specialty distribution in Massachusetts
How Pediatric Rheumatology Physician compares to other specialties among Massachusetts providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Pediatric Rheumatology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Mary Beth Son, M.D. appears in the CMS NPPES registry as a Pediatric Rheumatology Physician provider holding M.D. credentials at 300 LONGWOOD AVE, Boston, MA, 02115, with a listed phone of (617) 355-6117. NPI 1972665909 was issued on 12/15/2006.
Medicare Part D records for calendar year 2023 show 35 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $43K in drug spend.
Pediatric Rheumatology Physician is a narrow specialty nationwide, with 394 enrolled providers across 43 states and an average of 200 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1972665909 |
|---|---|
| Specialty | Pediatric Rheumatology Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 12/15/2006 |
Hospital and facility affiliations
Facilities where Mary Beth Son, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Children's Hospital Pediatric Associates, Inc
Boston, MA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Massachusetts BORIM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Mary Beth Son, M.D.. To verify Mary Beth Son, M.D.'s current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
35
Total Claims
$43K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 35
- Total Day Supply
- 1,032
- Generic Drug Cost
- $256
Patient Demographics
- Average Patient Age
- 22.0 years
- Avg HCC Risk Score
- 2.75
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Famotidine | 13 |
| Prednisone | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Pediatric Rheumatology Physician in MA →
All providers in Massachusetts →
Compare specialties →
Pediatric Rheumatology Physician Overview
How Mary Beth Son, M.D. fits within the Pediatric Rheumatology Physician landscape nationally.
394
Pediatric Rheumatology Physician Providers in US
43
States with Pediatric Rheumatology Physician
200
Avg Claims per Provider
Mary Beth Son, M.D.'s 35 claims are below the specialty average of 200.
Nearby Pediatric Rheumatology Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Son.
Dr. Elizabeth Ang
MD
Boston, MA
Dr. Peter Blier
MD
Springfield, MA
Dr. Daniel Brown
M.D.
Boston, MA
Dr. Joyce Chang
M.D.
Boston, MA
Dr. Margaret Chang
M.D., PH.D.
Boston, MA
Compare Pediatric Rheumatology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Pediatric Rheumatology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Mary Beth Son, M.D.'s specialty? ▼
Mary Beth Son, M.D. specializes in Pediatric Rheumatology Physician and practices in Boston, Massachusetts. Credentials: M.D..
How much does Mary Beth Son, M.D. prescribe under Medicare Part D? ▼
In 2023, Mary Beth Son, M.D. wrote 35 Medicare Part D claims totaling $43K in drug costs for N/A beneficiaries.
Where is Mary Beth Son, M.D. located? ▼
Mary Beth Son, M.D. is located at 300 LONGWOOD AVE, Boston, MA, 02115. Phone: (617) 355-6117.
What is Mary Beth Son, M.D.'s NPI number? ▼
Mary Beth Son, M.D.'s National Provider Identifier (NPI) is 1972665909, issued on 12/15/2006.
How many Pediatric Rheumatology Physician providers are there in the US? ▼
There are 394 Pediatric Rheumatology Physician providers across 43 states in the US. The average Pediatric Rheumatology Physician provider writes 200 Medicare Part D claims per year.
What drugs does Mary Beth Son, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mary Beth Son, M.D.'s most frequently prescribed drugs include Famotidine, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mary Beth Son, M.D. accept Medicare? ▼
Mary Beth Son, M.D. appears in CMS Medicare data with 35 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mary Beth Son, M.D.'s credentials? ▼
Mary Beth Son, M.D.'s NPI is 1972665909 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.