Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Alan B Marks, MD

Rheumatology Physician in Concord, MA · enumerated 2006.

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

National Provider Identifier

1689773236

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Registry record

Entity type Individual (Type 1)

Name Mr. Alan B Marks

Credential MD

Sex Male

Practice address 290 Baker Ave Suite 102n, Alan B Marks MD, Concord, MA, 01742

Phone (978) 369-0502

Fax (978) 369-5943

Enumeration date Sep 21, 2006

Last updated in NPPES Sep 10, 2012

Taxonomy & licenses

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 42968 (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
042968	Other	-	TUFTS
25057	Other	-	HARVARD PILGRIM

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 specialty is Alan Marks?

Alan Marks is registered in NPPES with the primary taxonomy of Rheumatology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-10.