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

Marek Walczak, M.D.

Hospitalist Physician in Plainview, TX · enumerated 2009.

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

National Provider Identifier

1083840375

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Registry record

Entity type Individual (Type 1)

Name Marek Walczak

Credential M.D.

Sex Male

Practice address Plainview, TX, 79072

Phone (806) 296-5531

Enumeration date Jun 1, 2009

Last updated in NPPES Jul 1, 2026

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

Taxonomy & licenses

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License N0537 (TX) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License N0537 (TX) Secondary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Marek Walczak practice?

The practice location on file with NPPES is in Plainview, TX. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Marek Walczak?

The National Provider Identifier (NPI) for Marek Walczak is 1083840375, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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