Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nicholas Marks, M.D.

Obstetrics & Gynecology Physician in Littleton, NH · enumerated 2006.

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

National Provider Identifier

1669448650

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Registry record

Entity type Individual (Type 1)

Name Nicholas Marks

Credential M.D.

Sex Male

Practice address 580 St. Johnsbury Rd., Littleton, NH, 03561

Phone (603) 444-9371

Fax (603) 444-9075

Enumeration date Feb 28, 2006

Last updated in NPPES Sep 3, 2014

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 12267 (NH) 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
5414128	Other	NH	CIGNA HEALTHCARE
80300008	Medicaid	NH	-
H64742	Other	NH	HARVARD PILGRIM HEALTHCAR
01Y003926ME02	Other	NH	BLUE CROSS/BLUE SHIELD
1010578	Medicaid	VT	-
785945	Other	NH	MVP

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 Nicholas Marks?

Nicholas Marks is registered in NPPES with the primary taxonomy of Obstetrics & Gynecology 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-09-03.