Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Lewis Vandewalker, M.D.

Allergy Physician in Columbia, MO · enumerated 2007.

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

National Provider Identifier

1386833358

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Lewis Vandewalker

Credential M.D.

Sex Male

Practice address 601 W Nifong Blvd, Suite 2b, Columbia, MO, 65203

Phone (573) 446-7000

Fax (573) 445-1000

Enumeration date Oct 16, 2007

Last updated in NPPES Oct 16, 2007

Taxonomy & licenses

207KA0200X Allergy Physician Allopathic & Osteopathic Physicians · License R2F17 (MO) 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 Vandewalker's NPI record?

Cross-check NPI 1386833358 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1386833358 active?

Yes, as of the latest NPPES snapshot, NPI 1386833358 is active (record last updated 2007-10-16).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-16.