NPPES file of Aug 9, 2026

Justin D. Triemstra, M.D.

Pediatrics Physician · Grand Rapids, MI

Justin D. Triemstra, M.D. is a pediatrics physician with a practice address in Grand Rapids, Michigan, and NPI 1588002661, issued on Jun 11, 2013. Check the license (Michigan 4301111989, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1588002661
Name
Justin D. Triemstra
Credential
M.D.
Primary taxonomy
Pediatrics Physician 208000000X
License number
4301111989 MI
Self-reported in NPPES; status is on the state search
Practice location
275 Michigan St NE, Grand Rapids, MI 49503
Phone
(616) 391-2123
Enumerated
Jun 11, 2013
Record last updated
Jun 17, 2025
Medicare enrollment
Enrolled (PECOS I20170707003100); accepts Medicare assignment
Medical or professional school
Loyola University Of Chicago, Stritch School Of Medicine, 2013
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest pediatrics physician records → All 2,180 in Michigan → Look up another NPI →

Also registered at 275 Michigan St NE

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

  1. Shan Abbas, M.D.Epilepsy Physician1730362674
  2. Esam Abobaker, DONeurology Physician1225770639
  3. Asad Ahrar, MDVascular Neurology Physician1861919722
  4. Shruti Anand, MDGeriatric Medicine (Internal Medicine) Physician1063908416
  5. Mara Arnett, PA-CPhysician Assistant1841692001
  6. Charles Asbury, D.O.Epilepsy Physician1114378692

Verify Justin D. Triemstra 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 4301111989    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.

Is this page about you? You can ask us to correct, restrict or remove it: how.

Bills Medicare through one group practice

  1. Spectrum Health Primary Care PartnersGrand Rapids, MI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Justin D. Triemstra among 2,180 pediatrics physician records in Michigan

Justin D. Triemstra, M.D. is one of 2,180 pediatrics physician records with a practice address in Michigan. 38% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 67% of them.

  • NPI issued2013 · 67% of these records are older, 30% newer
  • In a Medicare fileYes · 38% of these records are
  • In the CMS Doctors and Clinicians fileYes · 11% of these records are
  • Graduated2013 · median 2011 among the 235 with a school on file
  • Record last updated2025 · 52% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

251 pediatrics physician records list a practice address in Grand Rapids

They are 251 of the 18,005 NPPES records with a practice address in Grand Rapids, and 2,180 pediatrics physician records in Michigan.

All 2,180 in Michigan → Every provider in Grand Rapids → Pediatrics Physician nationwide →

The 8 pediatrics physician records with the nearest ZIP codes

  1. Rebecca Bultman, MDGrand Rapids, MI 495031972574309
  2. Timothy Conroy, MDGrand Rapids, MI 495031932189651
  3. Jill Golden, M.D.Grand Rapids, MI 495031396793261
  4. Jeri Kessenich, MDGrand Rapids, MI 495031386624633
  5. Cheryl Kuz, MDGrand Rapids, MI 495031447230107
  6. Michael Metz, MDGrand Rapids, MI 495031083694426
  7. James Moses, MDGrand Rapids, MI 495031912998683
  8. Dominic Sanfilippo, MDGrand Rapids, MI 495031386615763

Common questions

What is Justin D. Triemstra, M.D.'s NPI number?

Justin D. Triemstra, M.D.'s National Provider Identifier (NPI) is 1588002661, issued on Jun 11, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Justin D. Triemstra, M.D. located?

The NPPES record lists a practice address at 275 Michigan St NE, Grand Rapids, MI, 49503. Phone: (616) 391-2123. Providers update this record themselves, so call before visiting.

How can I verify Justin D. Triemstra, M.D.'s license?

NPPES lists Michigan license number 4301111989, 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. Medicare files from data.cms.gov. 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.