Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Francis Bilski, D. O.

Family Medicine Physician in Newark, DE · enumerated 2006 · practices at Anna Marie Sullivan D.O. P.A..

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

National Provider Identifier

1619922598

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Registry record

Entity type Individual (Type 1)

Name Dr. William Francis Bilski

Credential D. O.

Sex Male

Practice address 2 Polly Drummond Hill Rd, Newark, DE, 19711

Phone (302) 368-3600

Fax (302) 368-6099

Enumeration date May 22, 2006

Last updated in NPPES Nov 14, 2012

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License C20003381 (DE) 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
000255903	Medicaid	DE	-

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

How do I verify William Bilski's NPI record?

Cross-check NPI 1619922598 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1619922598 active?

Yes, as of the latest NPPES snapshot, NPI 1619922598 is active (record last updated 2012-11-14).

Other providers at this practice address

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Anna Marie Sullivan D.O. P.A. Health Service Clinic/Center · Newark, DE NPI 1194026088

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-11-14.