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

Dr. Alexander Adu Clerk, M.D.

Sleep Specialist (PhD) in San Jose, CA · enumerated 2006.

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

National Provider Identifier

1902911381

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Registry record

Entity type Individual (Type 1)

Name Dr. Alexander Adu Clerk

Credential M.D.

Sex Male

Practice address San Jose, CA, 95128

Phone (408) 295-4532

Fax (408) 295-4738

Enumeration date Aug 19, 2006

Last updated in NPPES Jan 19, 2021

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

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License A36573 (CA) Secondary

173F00000X Sleep Specialist (PhD) Other Service Providers · License 448 (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

Where does Alexander Clerk practice?

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

What is the NPI number for Alexander Clerk?

The National Provider Identifier (NPI) for Alexander Clerk is 1902911381, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-19.