Registry data as of Aug 27, 2026

Gregory Flentje, M.D. PHD

Child & Adolescent Psychiatry Physician · Kentwood, MI

Gregory Flentje, M.D. PHD is a child & adolescent psychiatry physician with a practice address in Kentwood, Michigan, and NPI 1669405163, issued on Jul 8, 2006. Check the license on the Michigan Board of Medicine; the Medicare figures below come from public CMS files.

Record from CMS NPPES, loaded Aug 27, 2026 · Medicare files 2023 and 2024 · method · Verify with CMS →

NPPES recordas of Aug 27, 2026
1669405163
Name
Gregory Flentje
Credential
M.D. PHD
Primary taxonomy
Child & Adolescent Psychiatry Physician 2084P0804X
Practice location
1403 60TH St SE, Kentwood, MI 49508
Phone
(616) 719-4488
Enumerated
Jul 8, 2006
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.
Download card Updates feed

Also registered at 1403 60TH St SE

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

  1. Marissa BultsmaClinical Social Worker1407708969
  2. Randall Christenson, MDGeriatric Psychiatry Physician1144253642
  3. Joshua Colby, M.A, LPC, CAADCAddiction (Substance Use Disorder) Counselor1093943169
  4. Lee Deckrow, LMSWSocial Worker1891800868
  5. Philip Fox, MDPsychiatry Physician1013976596
  6. Nicole Mick, LMSWClinical Social Worker1164091567

Verify Gregory Flentje in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMichigan Board of MedicineCheck 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.

90% fewer Medicare Part D claims than the average child & adolescent psychiatry physician in 2024

62 Medicare Part D claims for 23 beneficiaries, against an average of 608 among the 3,047 providers of this specialty who prescribed in Part D.

  1. Gregory Flentje62
  2. Specialty average608

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Child & Adolescent Psychiatry Physician providers in Michigan

There are 133 child & adolescent psychiatry physician records in Michigan.

All 133 in Michigan → Every provider in Kentwood →

Other child & adolescent psychiatry physician records in Michigan

  1. Hiba Abu Suhaiban, M.DJackson, MI1972090801
  2. Zakia Alavi, M.D.Jackson, MI1154474617
  3. Birgit Amann, M.D.Troy, MI1386663789
  4. Brian Ameel, MDSaginaw, MI1124095971
  5. Laura Andersen, M.D.Ann Arbor, MI1225478985
  6. Phillip Archer, M.D.Southfield, MI1487780672
  7. Cecilia Astorga-Switzer, M.D.Detroit, MI1659395044
  8. David Averbach, M.D., M.S.I.A.Commerce Township, MI1093907834
  9. Basivi Baddigam, MDClinton Twp, MI1386645299
  10. Kristine Baker, M.D.Traverse City, MI1235375775

Common questions

What is Gregory Flentje, M.D. PHD's NPI number?

Gregory Flentje, M.D. PHD's National Provider Identifier (NPI) is 1669405163, issued on Jul 8, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Gregory Flentje, M.D. PHD located?

The NPPES record lists a practice address at 1403 60TH St SE, Kentwood, MI, 49508. Phone: (616) 719-4488. Providers update this record themselves, so call before visiting.

How can I verify Gregory Flentje, M.D. PHD's license?

Search the Michigan Board of Medicine at https://www.michigan.gov/lara/bureau-list/bpl/health/hp-lic-health-prof/medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Gregory Flentje, M.D. PHD prescribe under Medicare Part D?

In 2024, Gregory Flentje, M.D. PHD had 62 Medicare Part D claims for 23 beneficiaries; the average among child & adolescent psychiatry physician prescribers was 608. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.