Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark J Tieszen, MD

Q: What is the NPI number for Mark Tieszen?

The National Provider Identifier (NPI) for Mark Tieszen is 1003838681, a Type 1 (individual) record in the CMS NPPES registry.

Critical Care Medicine (Internal Medicine) Physician in Wyoming, MI · enumerated 2006.

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

National Provider Identifier

1003838681

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Registry record

Entity type Individual (Type 1)

Name Mark J Tieszen

Credential MD

Sex Male

Practice address 5900 Byron Center Ave Sw, Wyoming, MI, 49519

Phone (616) 252-7200

Enumeration date Jul 24, 2006

Last updated in NPPES Mar 17, 2018

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 4301108689 (MI) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 6606 (ND) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 4301108689 (MI) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Mark Tieszen practice?

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

What is the NPI number for Mark Tieszen?

The National Provider Identifier (NPI) for Mark Tieszen is 1003838681, 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 2018-03-17.