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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark A Vierra, M.D.

Specialist in Poway, CA · enumerated 2005.

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

National Provider Identifier

1730187121

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Registry record

Entity type Individual (Type 1)
Name Dr. Mark A Vierra
Credential M.D.
Sex Male
Practice address 15525 Pomerado Rd, Suite A-2, Poway, CA, 92064
Phone (858) 451-3311
Fax (858) 451-1142
Enumeration date Jul 11, 2005
Last updated in NPPES Jul 15, 2010

Taxonomy & licenses

174400000X Specialist Other Service Providers · License A64866 (CA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
00A648660 Medicaid CA -

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

Is NPI 1730187121 active?
Yes, as of the latest NPPES snapshot, NPI 1730187121 is active (record last updated 2010-07-15).
How do I verify Mark Vierra's NPI record?
Cross-check NPI 1730187121 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-07-15.