Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas E. Arnold, M.D.

Vascular Surgery Physician in Port Jefferson Station, NY · enumerated 2006.

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

National Provider Identifier

1356312334

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas E. Arnold

Credential M.D.

Sex Male

Practice address 1110 Hallock Avenue, Port Jefferson Station, NY, 11776

Phone (631) 476-9100

Enumeration date Jan 30, 2006

Last updated in NPPES Apr 9, 2014

Taxonomy & licenses

2086S0129X Vascular Surgery Physician Allopathic & Osteopathic Physicians · License 193100 (NY) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Thomas Arnold's NPI record?

Cross-check NPI 1356312334 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1356312334 active?

Yes, as of the latest NPPES snapshot, NPI 1356312334 is active (record last updated 2014-04-09).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-04-09.