Aaron Grinstein, PA
NPI 1457762106 · Physician Assistant · Easthampton, MA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Aaron Grinstein, PA is a Physician Assistant provider in Easthampton, MA (NPI 1457762106).
Provider details
- NPI number
- 1457762106
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA
- Sex
- Male
- Sole proprietor
- No
- License
- AMD-875 (HI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
12 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
4 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Atorvastatin Calcium | 13 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (3)
- 31 Hall DrAmherst, MA 01002-2751Phone: (413) 256-8561Fax: (866) 644-0869
- 70 Main StFlorence, MA 01062Phone: (413) 586-8400Fax: (866) 644-0872
- 329 Conway StGreenfield, MA 01301-1521Phone: (413) 774-6301Fax: (866) 644-0871
Registry dates
- Enumerated
- 2014-05-15
- Last updated
- 2025-03-10
- Certified
- 2025-02-25
Frequently asked questions
- What is Aaron Grinstein's NPI number?
- Aaron Grinstein's National Provider Identifier (NPI) is 1457762106, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Aaron Grinstein's specialty?
- Aaron Grinstein is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Aaron Grinstein located?
- Aaron Grinstein's practice location on file with NPPES is 238 Northampton St, Easthampton, MA 01027-1046.
- What is Aaron Grinstein's phone number?
- The practice phone number listed in the NPPES registry for Aaron Grinstein is (413) 529-9300.
- Does Aaron Grinstein accept Medicare?
- Aaron Grinstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Aaron Grinstein's NPI active?
- Yes — Aaron Grinstein's NPI (1457762106) is active in the NPPES registry as of the last update on 2025-03-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.