Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Alexander Tang, MD

Pediatrics Physician in Boston, MA · enumerated 2019.

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

National Provider Identifier

1821652520

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Registry record

Entity type Individual (Type 1)

Name Alexander Tang

Credential MD

Sex Male

Practice address Boston, MA, 02115

Phone (617) 355-6000

Enumeration date Apr 28, 2019

Last updated in NPPES Dec 17, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 1014701 (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.

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Frequently asked questions

How do I verify Alexander Tang's NPI record?

Cross-check NPI 1821652520 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821652520 active?

Yes, as of the latest NPPES snapshot, NPI 1821652520 is active (record last updated 2025-12-17).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-17.