NPI Portal NPI Lookup & Verification

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

Dr. Mark Derek Emerson, DC

Chiropractor in Saratoga, CA · enumerated 2007.

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

National Provider Identifier

1801939046

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Registry record

Entity type Individual (Type 1)
Name Dr. Mark Derek Emerson
Credential DC
Sex Male
Practice address Saratoga, CA, 95070
Phone (408) 872-1031
Fax (408) 872-1074
Enumeration date Feb 15, 2007
Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 851 (HI) Secondary
111N00000X Chiropractor Chiropractic Providers · License 26278 (CA) Primary
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

Other identifiers

Identifier Type State Issuer
851 Other HI HAWAII CHIROPRACTIC LICEN
26278 Other CA CA-LICENSE

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 Emerson's NPI record?
Cross-check NPI 1801939046 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1801939046 active?
Yes, as of the latest NPPES snapshot, NPI 1801939046 is active (record last updated 2007-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.