Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Bassel H Mahmoud, M.D., PH.D.

Dermatology Physician in Worcester, MA · enumerated 2009.

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

National Provider Identifier

1801023841

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Registry record

Entity type Individual (Type 1)

Name Dr. Bassel H Mahmoud

Credential M.D., PH.D.

Sex Male

Practice address 281 Lincoln St, Worcester, MA, 01605

Phone (508) 334-5979

Fax (508) 334-8466

Enumeration date Jun 17, 2009

Last updated in NPPES Nov 17, 2020

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 257776 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
110116426A	Medicaid	MA	-

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

Is NPI 1801023841 active?

Yes, as of the latest NPPES snapshot, NPI 1801023841 is active (record last updated 2020-11-17).

How do I verify Bassel Mahmoud's NPI record?

Cross-check NPI 1801023841 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-11-17.