Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael Casmir Kowalczyk, DO

Internal Medicine Physician in Lansing, MI · enumerated 2005.

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

National Provider Identifier

1649277211

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Registry record

Entity type Individual (Type 1)

Name Michael Casmir Kowalczyk

Credential DO

Sex Male

Practice address 3955 Patient Care Dr Ste A, Lansing, MI, 48911

Phone (517) 374-7600

Fax (885) 480-9150

Enumeration date Jun 28, 2005

Last updated in NPPES Mar 18, 2025

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MK010436 (MI) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
2901730-11	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

Is NPI 1649277211 active?

Yes, as of the latest NPPES snapshot, NPI 1649277211 is active (record last updated 2025-03-18).

How do I verify Michael Kowalczyk's NPI record?

Cross-check NPI 1649277211 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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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-18.