NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Leung, M.D.

Gastroenterology Physician in Boston, MA · enumerated 2006.

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

National Provider Identifier

1447328711

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. John Leung
Credential M.D.
Sex Male
Practice address 65 Harrison Ave Ste 201, Boston, MA, 02111
Phone (617) 804-6767
Fax (877) 726-8492
Enumeration date Dec 2, 2006
Last updated in NPPES Jul 28, 2022

Taxonomy & licenses

207KI0005X Clinical & Laboratory Immunology (Allergy & Immunology) Physician Allopathic & Osteopathic Physicians · License 230907 (MA) Secondary
207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License 230907 (MA) Secondary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 230907 (MA) Secondary
207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 230907 (MA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

Where does John Leung practice?
The practice location on file with NPPES is in Boston, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Leung?
The National Provider Identifier (NPI) for John Leung is 1447328711, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-28.