Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stephen L Blonsky, MD

Nephrology Physician in Muskego, WI · enumerated 2006.

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

National Provider Identifier

1497855126

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Registry record

Entity type Individual (Type 1)

Name Stephen L Blonsky

Credential MD

Sex Male

Practice address S88w12923 Upland Ln, Muskego, WI, 53150

Phone (715) 212-1291

Enumeration date Sep 23, 2006

Last updated in NPPES Jun 22, 2020

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 27560 (WI) Primary

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

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

What is the NPI number for Stephen Blonsky?

The National Provider Identifier (NPI) for Stephen Blonsky is 1497855126, a Type 1 (individual) record in the CMS NPPES registry.

Where does Stephen Blonsky practice?

The practice location on file with NPPES is in Muskego, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-06-22.