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

Dr. Mark Steven Nelson, DDS

Dentist in Los Angeles, CA · enumerated 2009.

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

National Provider Identifier

1346577400

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Steven Nelson

Credential DDS

Sex Male

Practice address Los Angeles, CA, 90048

Phone (323) 933-4444

Fax (323) 933-0684

Enumeration date Nov 11, 2009

Last updated in NPPES Nov 11, 2009

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

Taxonomy & licenses

122300000X Dentist Dental Providers · License 30628 (CA) 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.

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Frequently asked questions

How do I verify Mark Nelson's NPI record?

Cross-check NPI 1346577400 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1346577400 active?

Yes, as of the latest NPPES snapshot, NPI 1346577400 is active (record last updated 2009-11-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-11-11.