NPPES file of Aug 9, 2026

James A. Guigelaar, MD

Internal Medicine Physician · Bay City, MI

James A. Guigelaar, MD is an internal medicine physician with a practice address in Bay City, Michigan, and NPI 1831105956, issued on Jul 31, 2006. Check the license (Michigan JG042006, 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
1831105956
Name
James A. Guigelaar
Credential
MD
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
JG042006 MI
Self-reported in NPPES; status is on the state search
Practice location
200 S Wenona St, Bay City, MI 48706
Phone
(989) 893-9705
Enumerated
Jul 31, 2006
Record last updated
Nov 19, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(989) 893-8206
Medicaid ID
4159093 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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Also registered at 200 S Wenona St

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

  1. Selina Akbar, M.D.Internal Medicine Physician1568571453
  2. Subbarao Chavali, M.D.Cardiovascular Disease Physician1669490769
  3. Cynthia Hack, LMSW, CSWClinical Social Worker1255393153
  4. Robert Lee, MDSpecialist1801957915
  5. Margarethe Maciulis, MDEndocrinology, Diabetes & Metabolism Physician1689650103
  6. Sang Oh, MDObstetrics & Gynecology Physician1467468959

Verify James A. Guigelaar 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 JG042006    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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29 internal medicine physician records list a practice address in Bay City

They are 29 of the 2,380 NPPES records with a practice address in Bay City, 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 29 in Bay City → All 5,735 in Michigan → Every provider in Bay City →

Other internal medicine physician records in Michigan

  1. Jamie Therese Abad, MDDetroit, MI1700573359
  2. Tomas Abalo, M.D.Iron Mountain, MI1336199975
  3. Ali Abbas, M.D.Pontiac, MI1972167526
  4. Sura Abbas, MDWarren, MI1801687405
  5. Ramzi Abbasi, MDSaginaw, MI1164270005
  6. Saadat Abbasi, MDKalamazoo, MI1912005596
  7. Shahzaman Abbasi, MDLansing, MI1376512111
  8. Youssef Abbiss, D.O.Mount Clemens, MI1982991881
  9. Valerie Abbott, MDSouthfield, MI1740289487
  10. Samer Abboud, MDSaginaw, MI1245804178

Common questions

What is James A. Guigelaar, MD's NPI number?

James A. Guigelaar, MD's National Provider Identifier (NPI) is 1831105956, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.

Where is James A. Guigelaar, MD located?

The NPPES record lists a practice address at 200 S Wenona St, Bay City, MI, 48706. Phone: (989) 893-9705. Providers update this record themselves, so call before visiting.

How can I verify James A. Guigelaar, MD's license?

NPPES lists Michigan license number JG042006, 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.