Dr. Marcus Wesley Lum, MD
- Medicare services, 2024
- 333
- Medicare patients, 2024
- 126
- Part D claims, 2024
- 7,643
- Hospital affiliations
- 1
- Industry payments
- $9,577
- Practice address
- 15625 Imperial Hwy, La Mirada, CA 90638
- Practice phone
- Call (562) 902-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Imperial Primary Care Medical Group
La Mirada, California
Find Dr. Lum's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Marcus Wesley Lum is a family medicine physician in La Mirada, California
Dr. Lum practices at Imperial Primary Care Medical Group in La Mirada, California.
Dr. Lum's NPI, 1003839242, was assigned on July 26, 2006. Dr. Lum holds California license G073347.
- NPI
- 1003839242NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3072588912
- NPI enumeration date
- July 26, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (562) 902-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marcus Wesley Lum practices at Imperial Primary Care Medical Group in La Mirada, California
Dr. Lum's primary practice is Imperial Primary Care Medical Group, at 15625 Imperial Hwy, La Mirada, CA 90638 in Los Angeles County. The practice phone is (562) 902-3000.
- Imperial Primary Care Medical Group15625 Imperial Hwy, La Mirada, CA 90638 · Los Angeles CountyPhone(562) 902-3000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Marcus Wesley Lum is affiliated with 3 sites of care and 1 medical group
Dr. Lum's primary practice is Imperial Primary Care Medical Group in La Mirada, California. Dr. Lum is also affiliated with PIH Health Whittier Hospital. The medical group on file is Imperial Primary Care Medical Group. Dmand AI also links Dr. Lum to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Marcus Wesley Lum's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lum practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Imperial Primary Care Medical Group | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marcus Wesley Lum is one of 15,680 family medicine physicians in California
Family medicine is Dr. Lum's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Lum is licensed in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Family medicine physicians near Dr. Lum
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marcus Wesley Lum billed Medicare for 333 services in 2024
CMS data shows 333 Medicare services from Dr. Lum across 7 procedure codes in 2024, for 126 Medicare patients. Medicare paid $24,626 for them. Every service was in an office.
Dr. Lum's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2592024: 22314%
- Other services
- 2023: 902024: 5934%
- Surgery
- 2023: 272024: 2411%
- Lab and pathology
- 2023: 202024: 1430%
- Tests and treatments
- 2023: 442024: 1370%
Dr. Lum compared with the California median for family medicine physicians, 2024
- Dr. Lum
- California median
- Medicare services
- 333vs 24635% above
- Medicare patients
- 126vs 1187% above
- Part D claims
- 6,970vs 8338.4 times
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Lum's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marcus Wesley Lum treated 126 Medicare patients in 2024, average age 76
CMS counts 126 Medicare patients who saw Dr. Lum in 2024. The largest group is 65 to 74, with 62 patients. 70% of them have high blood pressure, and 62% have high cholesterol. 29% are also on Medicaid. Their average risk score is 1.18, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Lum's median patient age at 59, with 54% women.
Dr. Lum's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Lum's Medicare patients by sex, 2024
- Women7560%
- Men5140%
Chronic conditions among Dr. Lum's Medicare patients, 2024
- High blood pressure70%
- High cholesterol62%
- Arthritis44%
- Diabetes35%
- Chronic kidney disease32%
- Osteoporosis18%
- Anxiety17%
- Mood disorders17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lum's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Marcus Wesley Lum wrote 7,643 Medicare Part D claims in 2024
In 2024, Dr. Lum wrote 7,643 Medicare Part D claims for 565 patients. 87% of them were for generic drugs. CMS names the drug for 6,970 of them, across 123 drugs with 11 or more claims each, at $552,524 in total drug cost. In 2023, CMS named 6,915 claims across 116 drugs.
Dr. Lum's Part D claims by kind of drug, 2024
- Generic6,681 claims87%
- Brand-name901 claims12%
- Other61 claims1%
Dr. Lum's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Lum's Part D claims, 2024
- Opioids1%83 of 7,643 claims
- Antibiotics1%113 of 7,643 claims
- Antipsychotics, patients 65 and over0%37 of 7,643 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6,9152024: 6,9701%
Drugs named by CMS: 123 in 2024, 116 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Marcus Wesley Lum offers telehealth to Medicare patients
Dr. Lum accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Lum as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Marcus Wesley Lum received $9,577 in industry payments from 2016 to 2025
CMS Open Payments shows 537 general payments to Dr. Lum from 39 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Eli Lilly and Company paid the most, $1,265.
General payments to Dr. Lum by program year, 2016 to 2025
General payments to Dr. Lum by kind, 2016 to 2025
- Food and beverage$9,37998%
- Education$1972%
Companies that paid Dr. Lum the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Marcus Wesley Lum's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marcus Wesley Lum
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marcus Wesley Lum's NPI number?
Dr. Marcus Wesley Lum's NPI number is 1003839242. It was assigned on July 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marcus Wesley Lum?
Dr. Marcus Wesley Lum is a family medicine physician in La Mirada, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Marcus Wesley Lum practice?
Dr. Lum practices at 15625 Imperial Hwy, La Mirada, CA 90638. Dr. Lum's primary practice is Imperial Primary Care Medical Group in La Mirada, California. Dmand AI also links Dr. Lum to 1 group practice or clinic.
What is Dr. Marcus Wesley Lum's office phone number?
The practice phone on file for Dr. Lum is (562) 902-3000.
What is Dr. Marcus Wesley Lum's medical license number?
Dr. Lum holds California license G073347.
Which hospitals is Dr. Marcus Wesley Lum affiliated with?
Dr. Lum is affiliated with PIH Health Whittier Hospital.
What medical group is Dr. Marcus Wesley Lum part of?
Dr. Lum is linked to Imperial Primary Care Medical Group.
Does Dr. Marcus Wesley Lum accept Medicare?
Yes. CMS data shows Dr. Lum billed Medicare for 333 services in 2024, and Dr. Lum accepts Medicare assignment.
Does Dr. Marcus Wesley Lum offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Lum as offering telehealth services.
How many Medicare patients does Dr. Marcus Wesley Lum see?
CMS counts 126 Medicare patients who saw Dr. Lum in 2024, with an average age of 76.
Show 4 more questionsShow fewer questions
What services does Dr. Marcus Wesley Lum bill to Medicare?
In 2024, Dr. Lum's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and medicare service (G0439).
What drugs does Dr. Marcus Wesley Lum prescribe most?
In 2024 Medicare Part D data, Dr. Lum's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Levothyroxine Sodium.
Has Dr. Marcus Wesley Lum received payments from drug or device companies?
CMS Open Payments shows $9,577 in general payments to Dr. Lum from 39 companies from 2016 to 2025. The largest total came from Eli Lilly and Company.
How long has Dr. Marcus Wesley Lum been practicing?
Dr. Lum graduated from medical school in 1990, 36 years ago.
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