A fast, free, no-login way to look up any U.S. healthcare provider in the federal NPPES registry.

Lookups

NPI Lookup
NPI Registry
By Specialty
By State

Resources

Guides
For Providers / API
Data Sources
About

Legal

Privacy
Terms
Correct a record

Data is sourced from the public NPPES (National Plan and Provider Enumeration System) registry published by CMS. NPI Central is not affiliated with, or endorsed by, CMSor any healthcare provider. Information is provided “as is” for general reference and is not medical advice.

FCRA notice: NPI Central is not a consumer reporting agency. This information may not be used to determine eligibility for employment, credentialing, insurance, or any other purpose covered by the Fair Credit Reporting Act.

© 2026 NPI Central. All rights reserved.

Mark Hornstein, MD — NPI 1720038276, Boston, MA | NPI Central

Home/
NPI Lookup/
MA/
NPI 1720038276

IndividualActive

Mark Hornstein, MD

NPI 1720038276 · Reproductive Endocrinology Physician · Boston, MA

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

Reproductive Endocrinology PhysicianPrimary207VE0102XLicense 55051 (MA)
Allopathic & Osteopathic Physicians

Practice location

55 Fruit St

Boston, MA 02114-2621

Phone: (617) 726-8433

Approximate (ZIP-level) locationGet directions

More MA providers

Mailing address

111 Cypress St

Brookline, MA 02445-6002

Additional practice locations (1)

75 Francis St
Boston, MA 02115
Phone: (617) 732-4222

Registry dates

Enumerated: 2006-05-12
Last updated: 2024-06-11
Certified: 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.