Quick answers
- Does Helen P. Mastro accept Medicare assignment?
- Yes. Medicare's clinician data says Helen P. Mastro accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Helen P. Mastro see?
- In 2024, CMS data shows 15 Original Medicare patients and 61 services for Helen P. Mastro. This counts Original Medicare only and measures volume, not quality.
- What is Helen P. Mastro's NPI number?
- 1730152638. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Helen P. Mastro, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 15 |
|---|---|
| Services billed to Medicare | 61 |
| Different services or procedures | 2 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Therapy procedure reassessment for nutrition management, each 15 minutes (97803)52 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Diabetes75%
- High blood pressure73%
- High cholesterol73%
Practice locations
Addresses where Helen P. Mastro is enrolled with Medicare (CMS data updated October 2, 2026).
- 133 Brookline AveBoston, MA 02215 (617) 421‑1000
- 40 Holland StSomerville, MA 02144 (617) 629‑6000
Group practices
Medicare enrollment lists Helen P. Mastro as a member of this group (CMS data updated October 2, 2026).
- Atrius Health Inc1,222 clinicians in the group
Specialties
Find other clinicians: Registered Dietitian or Nutrition Professional, Massachusetts →
Other dietitians in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Other clinicians in Atrius Health Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MNT |
|---|---|
| Graduation year | 1979 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1730152638 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians