Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Nicolas A. Nelken, MD

Vascular Surgery Physician in Honolulu, HI · enumerated 2007.

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

National Provider Identifier

1396899902

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Registry record

Entity type Individual (Type 1)

Name Dr. Nicolas A. Nelken

Credential MD

Sex Male

Practice address 3288 Moanalua Rd, Honolulu, HI, 96819

Phone (808) 432-0000

Enumeration date Jan 22, 2007

Last updated in NPPES May 26, 2021

Taxonomy & licenses

2086S0129X Vascular Surgery Physician Allopathic & Osteopathic Physicians · License MD-12257 (HI) 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
0000241232	Other	HI	HMSA BILLING NUMBER
530007-01	Medicaid	HI	-

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 Nicolas Nelken?

Nicolas Nelken is registered in NPPES with the primary taxonomy of Vascular Surgery 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 2021-05-26.