Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Leon Frederick O'Neill IV, DO

Cardiovascular Disease Physician in Eatontown, NJ · enumerated 2007 · practices at Monmouth Cardiology Associates, LLC.

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

National Provider Identifier

1275723736

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Registry record

Entity type Individual (Type 1)

Name Dr. Leon Frederick O'Neill IV

Credential DO

Sex Male

Practice address 11 Meridian Rd, Eatontown, NJ, 07724

Phone (732) 776-5138

Fax (732) 776-6601

Enumeration date Jul 30, 2007

Last updated in NPPES Apr 9, 2024

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 0102208428 (VA) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 25MB08394100 (NJ) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
22-3052989	Other	NJ	TAX ID#
0267929	Medicaid	NJ	-

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.

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Frequently asked questions

How do I verify Leon O'Neill's NPI record?

Cross-check NPI 1275723736 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1275723736 active?

Yes, as of the latest NPPES snapshot, NPI 1275723736 is active (record last updated 2024-04-09).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-04-09.