Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Joseph Curtiss, DDS

General Practice Dentistry in Harbor Springs, MI · enumerated 2007.

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

National Provider Identifier

1508076399

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Registry record

Entity type Individual (Type 1)

Name Dr. William Joseph Curtiss

Credential DDS

Sex Male

Practice address 617 E Lake St, Harbor Springs, MI, 49740

Phone (231) 526-1166

Fax (231) 526-1188

Enumeration date May 23, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 012256 (MI) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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 William Curtiss practice?

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

What is the NPI number for William Curtiss?

The National Provider Identifier (NPI) for William Curtiss is 1508076399, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.