Marcus Wesley Lum, MD
Family Medicine Physician · La Mirada, CA
Marcus Wesley Lum, MD is a family medicine physician with a practice address in La Mirada, California, and NPI 1003839242, issued on Jul 26, 2006. Check the license (California G073347, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marcus Wesley Lum
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G073347 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15034 Imperial Hwy, La Mirada, CA 90638
- Phone
- (562) 902-3000
- Enumerated
- Jul 26, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (562) 902-9563
- Medicare enrollment
- Enrolled (PECOS I20101108001331); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 15034 Imperial Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marcus Wesley Lum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G073347Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average family medicine physician in 2024
7,643 Medicare Part D claims for 565 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 83 claims were for opioids.
Most prescribed
- Atorvastatin Calcium780 claims
- Amlodipine Besylate314 claims
- Levothyroxine Sodium287 claims
- Lisinopril284 claims
- Rosuvastatin Calcium279 claims
- Losartan Potassium251 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,012.11
48 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Imperial Primary Care Medical GroupLa Mirada, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marcus Wesley Lum among 17,133 family medicine physician records in California
Marcus Wesley Lum, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1990 · median 2005 among the 10,652 with a school on file
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 family medicine physician records list a practice address in La Mirada
They are 11 of the 427 NPPES records with a practice address in La Mirada, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in La Mirada → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Gregory Galbreath, M.D.La Mirada, CA 906381780022327
- Hyejin Jae, M.D.La Mirada, CA 906381851607253
- Eileen Lee, M.D.La Mirada, CA 906381932467347
- Claudia Martin, MDLa Mirada, CA 906381821462516
- Alexander Mendez, M.D.La Mirada, CA 906381255423323
- Nghia Pham, M.D.La Mirada, CA 906381841676491
- Joseph Ravenna, M.D.La Mirada, CA 906381548412869
- Anthony Reyes, M.D.La Mirada, CA 906381447332911
Common questions
What is Marcus Wesley Lum, MD's NPI number?
Marcus Wesley Lum, MD's National Provider Identifier (NPI) is 1003839242, issued on Jul 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marcus Wesley Lum, MD located?
The NPPES record lists a practice address at 15034 Imperial Hwy, La Mirada, CA, 90638. Phone: (562) 902-3000. Providers update this record themselves, so call before visiting.
How can I verify Marcus Wesley Lum, MD's license?
NPPES lists California license number G073347, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marcus Wesley Lum, MD prescribe under Medicare Part D?
In 2024, Marcus Wesley Lum, MD had 7,643 Medicare Part D claims for 565 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.