Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark A Vierra, MD

Surgery Physician in Monterey, CA · enumerated 2006.

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

National Provider Identifier

1295706448

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark A Vierra

Credential MD

Sex Male

Practice address 2 Upper Ragsdale Dr, B230, Monterey, CA, 93940

Phone (831) 649-0808

Enumeration date Jan 27, 2006

Last updated in NPPES Jan 11, 2010

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License G59649 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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 Vierra's NPI record?

Cross-check NPI 1295706448 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1295706448 active?

Yes, as of the latest NPPES snapshot, NPI 1295706448 is active (record last updated 2010-01-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-01-11.