Philip Louis Marjon, M.D.
Philip Louis Marjon is a Hematology & Oncology specialist based in San Marcos, CA with over 19 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Philip Louis Marjon, M.D. has practiced internal medicine for 19+ years, working in independent practice. Trained at University of New Mexico School of Medicine (class of 2007), he has been practicing for over 19 years. CMS Medicare data shows his patients commonly have high cholesterol, hypertension, and arthritis.
At a glance
- Uses generic medications more than 24% of reporting doctors in California
- Virtual visits available — no app or travel required
Older · 152dNPPES updated 2025-12-22 · verify NPI on CMS · Verify license at Medical Board of California
Contact & Location
Practice Location
838 Nordahl Rd Ste 300, San Marcos, CA 92069-3599
How Does This Doctor Compare?
Based on Medicare data, this doctor favors affordable generic drugs over brand-name ones.
Opioid Rx
↓ Lower = better7.69%
California avg: 5.2 · US avg: 5.1
⚠ Lower than most doctors nationally(+2.6 pts)
7.69% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better80.2%
California avg: 83.3 · US avg: 82.8
⚠ Lower than most doctors nationally(-2.6 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
61
Unique beneficiaries
Standard volumePrescription Recipients
202
Patients prescribed
Prescriptions Written
962
Total claims
Total Medicare drug cost: $1.86M
Percentile rankings compared against 9,360 reporting peers in California.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages High Cholesterol, Hypertension, and Arthritis.
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+2%) — a focus area for this doctor
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↑ More patients than average (+2%) — a focus area for this doctor
Diseases involving abnormal cell growth with potential to spread to other body parts
US avg: 20.8%↑ More patients than average (+13%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↓ Fewer patients than average (-1%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+3%) — a focus area for this doctor
Conditions affecting emotional state, including depression and bipolar disorder
The heart cannot pump blood efficiently enough to meet the body's needs
US avg: 22.5%↑ More patients than average (+8%) — a focus area for this doctor
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$6.2k received from industry
227 transactions reported in 2024 ·High tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Philip Louis Marjon's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 2007
University of New Mexico School of Medicine
Board certified · Dec 21, 2025
Self-reported via NPPES
19 years in practice
Experienced
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
Taxonomy: 207RH0003X
Education & Training
University of New Mexico School of Medicine (Class of 2007)
Mailing address
104 Woodmont Blvd Ste 500, Nashville, TN 37205-2245
Differs from practice location
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 190167
View hospital on Medicare Care CompareVirtual Hematology & Oncology Care With Philip Louis Marjon
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Philip Louis Marjon for cholesterol management, blood pressure monitoring, arthritis follow-ups — no travel to San Marcos required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Philip Louis Marjon
Dr. Marjon is listed as active in the NPI registry with telehealth listed in San Marcos, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (760) 747-8935.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Philip Louis Marjon
Practice Location
838 Nordahl Rd Ste 300, San Marcos, CA 92069-3599
Mailing Address
104 Woodmont Blvd Ste 500, Nashville, TN 37205-2245
This is a provider directory. Contact the office directly to schedule appointments.
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