Mark Hornstein, MD
NPI 1720038276 · Reproductive Endocrinology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Hornstein, MD is a Reproductive Endocrinology Physician provider in Boston, MA (NPI 1720038276).
Provider details
- NPI number
- 1720038276
- Entity type
- Individual
- Primary specialty
- Reproductive Endocrinology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 55051 (MA)
Specialties & taxonomies
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
2 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.
Practice location
Mailing address
Additional practice locations (1)
- 75 Francis StBoston, MA 02115Phone: (617) 732-4222
Registry dates
- Enumerated
- 2006-05-12
- Last updated
- 2024-06-11
- Certified
- 2024-06-11
Frequently asked questions
- What is Mark Hornstein's NPI number?
- Mark Hornstein's National Provider Identifier (NPI) is 1720038276, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Hornstein's specialty?
- Mark Hornstein is listed in the NPPES registry with a primary specialty of Reproductive Endocrinology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Hornstein located?
- Mark Hornstein's practice location on file with NPPES is 55 Fruit St, Boston, MA 02114-2621.
- What is Mark Hornstein's phone number?
- The practice phone number listed in the NPPES registry for Mark Hornstein is (617) 726-8433.
- Does Mark Hornstein accept Medicare?
- Mark Hornstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Hornstein's NPI active?
- Yes — Mark Hornstein's NPI (1720038276) is active in the NPPES registry as of the last update on 2024-06-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.