Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Leslie S T Fang, MD, PC

Q: What type of organization is Leslie S T Fang, MD, PC?

Leslie S T Fang, MD, PC is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

Internal Medicine Physician in Boston, MA · enumerated 2008 · authorized official Leslie Fang, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1871739649

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Registry record

Entity type Organization (Type 2)

Legal business name Leslie S T Fang, MD, PC

Practice address 151 Merrimac St, 3rd Floor, Boston, MA, 02114

Phone (617) 742-2054

Fax (617) 742-3157

Enumeration date Dec 30, 2008

Last updated in NPPES Dec 30, 2008

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 39471 (MA) Primary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 39471 (MA) Secondary

Authorized official

Name Leslie Fang

Title Owner

Phone (617) 742-2054

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What type of organization is Leslie S T Fang, MD, PC?

Leslie S T Fang, MD, PC is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-12-30.