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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Daniel M O Brien, DMD

General Practice Dentistry in Middletown, NY · enumerated 2006 · practices at Barry Fenner DDS PC.

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

National Provider Identifier

1235240334

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Registry record

Entity type Individual (Type 1)
Name Mr. Daniel M O Brien
Credential DMD
Sex Male
Practice address 831 Route 211 East, Middletown, NY, 10941
Phone (845) 692-5311
Fax (845) 692-6778
Enumeration date Aug 31, 2006
Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

122300000X Dentist Dental Providers · License 0344761 (NY) Secondary
1223G0001X General Practice Dentistry Dental Providers · License 0344761 (NY) Primary
DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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.

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Frequently asked questions

How do I verify Daniel O Brien's NPI record?
Cross-check NPI 1235240334 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1235240334 active?
Yes, as of the latest NPPES snapshot, NPI 1235240334 is active (record last updated 2025-09-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.