Robert Sackstein, MD PHD
NPI 1306887302 · Internal Medicine Physician · Boston, MA
Robert Sackstein, MD PHD is a Internal Medicine Physician provider in Boston, MA (NPI 1306887302).
Provider details
- NPI number
- 1306887302
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD PHD
- Sex
- Male
- License
- 155205 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
Mailing address
Registry dates
- Enumerated
- 2006-06-09
- Last updated
- 2025-09-11
Frequently asked questions
- What is Robert Sackstein's NPI number?
- Robert Sackstein's National Provider Identifier (NPI) is 1306887302, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Sackstein's specialty?
- Robert Sackstein is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Sackstein located?
- Robert Sackstein's practice location on file with NPPES is 100 Blossom Street, Boston, MA 02114-2617.
- What is Robert Sackstein's phone number?
- The practice phone number listed in the NPPES registry for Robert Sackstein is (617) 724-1124.
- Is Robert Sackstein's NPI active?
- Yes — Robert Sackstein's NPI (1306887302) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.