NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Hart, M.D.

Sleep Medicine (Internal Medicine) Physician in Capitola, CA · enumerated 2006.

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

National Provider Identifier

1609856582

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name William Hart
Credential M.D.
Sex Male
Practice address 815 Bay Ave, Suite B, Capitola, CA, 95010
Phone (831) 460-7300
Enumeration date Jan 18, 2006
Last updated in NPPES Dec 7, 2017

Taxonomy & licenses

207RS0012X Sleep Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License G62162 (CA) 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 William Hart?
The National Provider Identifier (NPI) for William Hart is 1609856582, a Type 1 (individual) record in the CMS NPPES registry.
Where does William Hart practice?
The practice location on file with NPPES is in Capitola, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-12-07.