Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William A Bonnefil, MD

Obstetrics & Gynecology Physician in Warren, MI · enumerated 2005.

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

National Provider Identifier

1639160930

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Registry record

Entity type Individual (Type 1)

Name Dr. William A Bonnefil

Credential MD

Sex Male

Practice address 11012 E 13 Mile Rd, Ste 212, Warren, MI, 48093

Phone (586) 582-7150

Fax (586) 582-7164

Enumeration date Nov 4, 2005

Last updated in NPPES Jun 28, 2026

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 4301030530 (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
4071780	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

What is the NPI number for William Bonnefil?

The National Provider Identifier (NPI) for William Bonnefil is 1639160930, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Bonnefil practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-28.