Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Tom Ryan Demeester, MD

Surgery Physician in Los Angeles, CA · enumerated 2006.

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

National Provider Identifier

1902837289

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Registry record

Entity type Individual (Type 1)

Name Tom Ryan Demeester

Credential MD

Sex Male

Practice address 1510 San Pablo St, Suite 514, Los Angeles, CA, 90033

Phone (323) 442-5910

Fax (323) 442-6798

Enumeration date Jul 5, 2006

Last updated in NPPES Oct 13, 2009

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License C42820 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
00C428200	Other	CA	BLUE SHIELD PIN
020023696	Other	CA	MEDICARE RAILROAD PIN
00C428200C29	Other	CA	CAL OPTIMA PIN
00C428200	Medicaid	CA	-

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.

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Frequently asked questions

Is NPI 1902837289 active?

Yes, as of the latest NPPES snapshot, NPI 1902837289 is active (record last updated 2009-10-13).

How do I verify Tom Demeester's NPI record?

Cross-check NPI 1902837289 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 2009-10-13.