Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Martin P. Greydanus, M.D.

Specialist in Grand Rapids, MI · enumerated 2005.

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

National Provider Identifier

1043215544

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Registry record

Entity type Individual (Type 1)

Name Dr. Martin P. Greydanus

Credential M.D.

Sex Male

Practice address 310 Lafayette Ave Se, Ste 400, Grand Rapids, MI, 49503

Phone (616) 752-6525

Fax (616) 752-6556

Enumeration date Jun 20, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 4301048500 (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
2701613	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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Martin Greydanus's NPI record?

Cross-check NPI 1043215544 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1043215544 active?

Yes, as of the latest NPPES snapshot, NPI 1043215544 is active (record last updated 2007-07-08).

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