Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Margarethe M Maciulis, MD

Endocrinology, Diabetes & Metabolism Physician in Bay City, MI · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1689650103

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Registry record

Entity type Individual (Type 1)

Name Dr. Margarethe M Maciulis

Credential MD

Sex Female

Practice address 200 S Wenona St, Suite 260, Bay City, MI, 48706

Phone (989) 894-6040

Fax (989) 892-3983

Enumeration date Dec 16, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 4301056636 (MI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
1100910591	Other	MI	BCR & BCN
2665811	Medicaid	MI	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is NPI 1689650103 active?

Yes, as of the latest NPPES snapshot, NPI 1689650103 is active (record last updated 2007-07-08).

How do I verify Margarethe Maciulis's NPI record?

Cross-check NPI 1689650103 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Algimantas Maciulis Rheumatology Physician · Bay City, MI NPI 1043295066 Theresa Weaver Professional Counselor · Bay City, MI NPI 1255393401 Cynthia Hack Clinical Social Worker · Bay City, MI NPI 1255393153 Visiting Nurse Services of Michigan Durable Medical Equipment & Medical Supplies · Bay City, MI NPI 1770531451 Russell Struble Family Medicine Physician · Bay City, MI NPI 1154355477 Subbarao Chavali Cardiovascular Disease Physician · Bay City, MI NPI 1669490769 James Guigelaar Internal Medicine Physician · Bay City, MI NPI 1831105956 Sang Oh Obstetrics & Gynecology Physician · Bay City, MI NPI 1467468959

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.