Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Arthur Michael Hoffman, M.D.

Psychiatry Physician in Mill Valley, CA · enumerated 2013.

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

National Provider Identifier

1285973719

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Registry record

Entity type Individual (Type 1)

Name Dr. Arthur Michael Hoffman

Credential M.D.

Sex Male

Practice address 30 Bayview Ave, Mill Valley, CA, 94941

Phone (415) 388-6700

Fax (415) 381-2316

Enumeration date Feb 4, 2013

Last updated in NPPES Feb 4, 2013

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License G18103 (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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Arthur Hoffman?

Arthur Hoffman is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-02-04.