Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mark Andrew De Simone, D.D.S.

General Practice Dentistry in Anna, TX · enumerated 2008.

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

National Provider Identifier

1275781619

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Andrew De Simone

Credential D.D.S.

Sex Male

Practice address Anna, TX, 75409

Phone (972) 924-2452

Enumeration date Aug 27, 2008

Last updated in NPPES Mar 20, 2010

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

122300000X Dentist Dental Providers · License 24109 (TX) Secondary

1223G0001X General Practice Dentistry Dental Providers · License 24109 (TX) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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

Is NPI 1275781619 active?

Yes, as of the latest NPPES snapshot, NPI 1275781619 is active (record last updated 2010-03-20).

How do I verify Mark De Simone's NPI record?

Cross-check NPI 1275781619 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-03-20.