IndividualActive
Erwin Greenstein
NPI 1972918621 · Pharmacist · Waltham, MA
Erwin Greenstein is a Pharmacist provider in Waltham, MA (NPI 1972918621).
Provider details
- NPI number
- 1972918621
- Entity type
- Individual
- Primary specialty
- PharmacistPharmacy Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 13124 (MA)
Specialties & taxonomies
Pharmacy Service Providers
Profile Score
Detailed profile(75/100 index)
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
1 documented practice location
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.
Practice location
80 River St
Waltham, MA 02453-8306
Phone: (781) 891-9750
Street-level locationGet directions
Mailing address
221 Bishops Forest Dr
Waltham, MA 02452-8804
Registry dates
- Enumerated
- 2014-06-20
- Last updated
- 2014-06-20
Frequently asked questions
- What is Erwin Greenstein's NPI number?
- Erwin Greenstein's National Provider Identifier (NPI) is 1972918621, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Erwin Greenstein's specialty?
- Erwin Greenstein is listed in the NPPES registry with a primary specialty of Pharmacist (Pharmacy Service Providers).
- Where is Erwin Greenstein located?
- Erwin Greenstein's practice location on file with NPPES is 80 River St, Waltham, MA 02453-8306.
- What is Erwin Greenstein's phone number?
- The practice phone number listed in the NPPES registry for Erwin Greenstein is (781) 891-9750.
- Is Erwin Greenstein's NPI active?
- Yes — Erwin Greenstein's NPI (1972918621) is active in the NPPES registry as of the last update on 2014-06-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.