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

Dr. Arthur Seiji Hayashi, MD

Family Medicine Physician in Washington, DC · enumerated 2006.

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

National Provider Identifier

1912069055

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Registry record

Entity type Individual (Type 1)

Name Dr. Arthur Seiji Hayashi

Credential MD

Sex Male

Practice address Washington, DC, 20003

Phone (202) 715-7900

Enumeration date Dec 14, 2006

Last updated in NPPES Aug 6, 2015

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

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License MD33159 (DC) 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 NPI 1912069055 active?

Yes, as of the latest NPPES snapshot, NPI 1912069055 is active (record last updated 2015-08-06).

How do I verify Arthur Hayashi's NPI record?

Cross-check NPI 1912069055 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-08-06.