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Marcus Wesley Lum, MD

Family Medicine Physician in La Mirada, CA · enumerated 2006 · practices at Caremore Health Plan.

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

National Provider Identifier

1003839242

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Registry record

Entity type Individual (Type 1)
Name Marcus Wesley Lum
Credential MD
Sex Male
Practice address 15034 Imperial Hwy, La Mirada, CA, 90638
Phone (562) 902-3000
Fax (562) 902-9563
Enumeration date Jul 26, 2006
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License G073347 (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 specialty is Marcus Lum?
Marcus Lum is registered in NPPES with the primary taxonomy of Family Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.