Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Steven R Sierakowski, DMD

Periodontics in Glen Mills, PA · enumerated 2006.

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

National Provider Identifier

1508889387

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Registry record

Entity type Individual (Type 1)

Name Dr. Steven R Sierakowski

Credential DMD

Sex Male

Practice address Glen Mills, PA, 19342

Phone (610) 558-8283

Fax (610) 558-9868

Enumeration date Jul 25, 2006

Last updated in NPPES Jul 22, 2021

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1223P0300X Periodontics Dental Providers · License 22DI02300400 (NJ) Secondary

1223P0300X Periodontics Dental Providers · License G1-0001284 (DE) Secondary

1223P0300X Periodontics Dental Providers · License DS036012 (PA) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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

Where does Steven Sierakowski practice?

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

What is the NPI number for Steven Sierakowski?

The National Provider Identifier (NPI) for Steven Sierakowski is 1508889387, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-22.