NPPES file of Aug 9, 2026

Mark J. Tieszen, MD

Critical Care Medicine (Internal Medicine) Physician · Wyoming, MI

Mark J. Tieszen, MD is a critical care medicine (internal medicine) physician with a practice address in Wyoming, Michigan, and NPI 1003838681, issued on Jul 24, 2006. Check the license (Michigan 4301108689, as entered in NPPES) on the Michigan Board of Medicine (LARA); the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1003838681
Name
Mark J. Tieszen
Credential
MD
Primary taxonomy
Critical Care Medicine (Internal Medicine) Physician 207RC0200X
License numbers
4301108689 MI
6606 ND
Self-reported in NPPES; status is on the state search
Practice location
5900 Byron Center Ave SW, Wyoming, MI 49519
Phone
(616) 252-7200
Enumerated
Jul 24, 2006
Record last updated
Mar 17, 2018 (not updated in 8 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest critical care medicine (internal medicine) physician records → All 178 in Michigan → Look up another NPI →

Also registered at 5900 Byron Center Ave SW

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Nichole Accetta, NPPsychiatric/Mental Health Nurse Practitioner1093111734
  2. Jacob Ackermann, DOStudent in an Organized Health Care Education/Training Program1376391870
  3. Abigail AdamsRegistered Dietitian1215574553
  4. Marc Afman, DOEmergency Medical Services (Emergency Medicine) Physician1700844511
  5. Maria Alfonso, PT, DPTPhysical Therapist1265935613
  6. Sarah AliStudent in an Organized Health Care Education/Training Program1437094828

Verify Mark J. Tieszen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
    Search for license 4301108689    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Michigan license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Mark J. Tieszen among 178 critical care medicine (internal medicine) physician records in Michigan

Mark J. Tieszen, MD is one of 178 critical care medicine (internal medicine) physician records with a practice address in Michigan. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 6% of them.

  • NPI issued2006 · 6% of these records are older, 64% newer
  • In a Medicare fileNo · 91% of these records are
  • In the CMS Doctors and Clinicians fileNo · 76% of these records are
  • Record last updated2018 · 30% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Critical Care Medicine (Internal Medicine) Physician providers in Michigan

There are 178 critical care medicine (internal medicine) physician records in Michigan. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 178 in Michigan → Every provider in Wyoming → Critical Care Medicine (Internal Medicine) Physician nationwide →

The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes

  1. Bethany BusackWyoming, MI 495191659802684
  2. Anita Charochak, D.O.Wyoming, MI 495191760484869
  3. Eric Feucht, MDWyoming, MI 495191356321996
  4. Gabriel Pedraza, MDWyoming, MI 495191992785588
  5. Jason Frost, D.O.Grand Rapids, MI 495031033260005
  6. Emily Gualtieri Riley, M.D.Grand Rapids, MI 495031124092275
  7. Noah Jentzen, M.D.Grand Rapids, MI 495031508109034
  8. Mark Koets, MDGrand Rapids, MI 495031891735825

Common questions

What is Mark J. Tieszen, MD's NPI number?

Mark J. Tieszen, MD's National Provider Identifier (NPI) is 1003838681, issued on Jul 24, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Mark J. Tieszen, MD located?

The NPPES record lists a practice address at 5900 Byron Center Ave SW, Wyoming, MI, 49519. Phone: (616) 252-7200. Providers update this record themselves, so call before visiting.

How can I verify Mark J. Tieszen, MD's license?

NPPES lists Michigan license number 4301108689, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.