NPPES file of Aug 9, 2026

Nancy Marthakis, DO

Internal Medicine Physician · Grand Rapids, MI

Nancy Marthakis, DO is an internal medicine physician with a practice address in Grand Rapids, Michigan, and NPI 1780946236, issued on Jun 11, 2012. Check the license (Michigan 5101020834, 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
1780946236
Name
Nancy Marthakis
Credential
DO
Primary taxonomy
Internal Medicine Physician 207R00000X
License numbers
5101020834 MI
02004027A IN
Self-reported in NPPES; status is on the state search
Practice location
3355 Eagle Park Dr NE Ste 103, Grand Rapids, MI 49525
Phone
(616) 942-7400
Enumerated
Jun 11, 2012
Record last updated
Jul 21, 2022
Fax
(616) 942-7405
Medicaid ID
1780946236 MI
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 internal medicine physician records → All 5,735 in Michigan → Look up another NPI →

Also registered at 3355 Eagle Park Dr NE Ste 103

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

  1. Justin Davies, M.D.Internal Medicine Physician1376807933
  2. John Duhn, DOFamily Medicine Physician1821043613
  3. Rhiannon Freiberg, NPPhysician Assistant1801289459
  4. Michelle Gingrich, NP-CFamily Nurse Practitioner1356861801
  5. Jeffery Libra, M.D.Family Medicine Physician1619009826
  6. Chia-Hui Neilly, DNP, FNP-BC,PMHNP-BCFamily Nurse Practitioner1447744727

Verify Nancy Marthakis 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 5101020834    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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Nancy Marthakis among 5,735 internal medicine physician records in Michigan

Nancy Marthakis, DO is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% 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 2012, is newer than 59% of them.

  • NPI issued2012 · 59% of these records are older, 39% newer
  • In a Medicare fileNo · 79% of these records are
  • In the CMS Doctors and Clinicians fileNo · 62% of these records are
  • Record last updated2022 · 54% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

451 internal medicine physician records list a practice address in Grand Rapids

They are 451 of the 18,005 NPPES records with a practice address in Grand Rapids, and 5,735 internal medicine physician records in Michigan. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 5,735 in Michigan → Every provider in Grand Rapids → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Craig Anderson, M.D.Grand Rapids, MI 495251568876290
  2. Michael Borgeld, MDGrand Rapids, MI 495251073614251
  3. Justin Davies, M.D.Grand Rapids, MI 495251376807933
  4. Kenneth Fawcett, MDGrand Rapids, MI 495251972507788
  5. Matthew Gale, MDGrand Rapids, MI 495251952565509
  6. John Heslip, M.D.Grand Rapids, MI 495251023016466
  7. Amanda Huver, DOGrand Rapids, MI 495251619960598
  8. Elizabeth Kozak, M.D.Grand Rapids, MI 495251811076805

Common questions

What is Nancy Marthakis, DO's NPI number?

Nancy Marthakis, DO's National Provider Identifier (NPI) is 1780946236, issued on Jun 11, 2012. An NPI identifies a provider in billing; it is not a license.

Where is Nancy Marthakis, DO located?

The NPPES record lists a practice address at 3355 Eagle Park Dr NE Ste 103, Grand Rapids, MI, 49525. Phone: (616) 942-7400. Providers update this record themselves, so call before visiting.

How can I verify Nancy Marthakis, DO's license?

NPPES lists Michigan license number 5101020834, 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.