Joseph D Chun, M.D.
Joseph D Chun is an Allergy & Immunology specialist based in Fullerton, CA with over 42 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Also practices: ALLERGY/IMMUNOLOGY, PEDIATRIC MEDICINE
Joseph D Chun, M.D. has been part of the Fullerton medical community since 2007 in group practice. A University of California, Geffen School of Medicine graduate since 1984, he brings 42+ years of experience. CMS Medicare data shows his patients commonly have high cholesterol, hypertension, and arthritis.
At a glance
- Prescribes opioids less than 55% of reporting doctors in California
- Uses generic medications more than 31% of reporting doctors in California
- Virtual visits available — no app or travel required
Older · 108dNPPES updated 2026-02-04 · verify NPI on CMS · Verify license at Medical Board of California
How Does This Doctor Compare?
Based on Medicare data, this doctor prescribes opioid pain medications conservatively, favors affordable generic drugs over brand-name ones.
Opioid Rx
↓ Lower = better0.36%
California avg: 5.2 · US avg: 5.1
✓ Higher than most doctors nationally(-4.7 pts)
Typical range among reporting doctors in California0.36% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better83.2%
California avg: 83.3 · US avg: 82.8
✓ Higher than most doctors nationally(+0.4 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
270
Unique beneficiaries
Standard volumePrescription Recipients
952
Patients prescribed
Prescriptions Written
14,704
Total claims
Total Medicare drug cost: $2.51M
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 (+5%) — 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%↓ Fewer patients than average (-4%) — less common here
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+7%) — a focus area for this doctor
Weakened bones that are more prone to fractures, common in older adults
US avg: 18.1%↑ More patients than average (+13%) — a focus area for this doctor
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↓ Fewer patients than average (-9%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$38 received from industry
2 transactions reported in 2024 ·Low 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 Joseph D Chun's NPI.
Patient Reviews
No patient reviews yet. If you've seen Joseph D Chun, your feedback helps other patients.
Review PolicyAll feedback is moderated before publishing. We verify reviewer identity where possible and enforce a one-review-per-provider policy. Full guidelines →
Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1984
David Geffen School of Medicine at Ucla
Board certified · Feb 3, 2026
Self-reported via NPPES
42 years in practice
Senior practitioner
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
Taxonomy: 207K00000X
Education & Training
University of California, Geffen School of Medicine (Class of 1984)
Mailing address
Po Box 35380, Las Vegas, NV 89133-5380
Differs from practice location
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 190319
View hospital on Medicare Care CompareVirtual Allergy & Immunology Care With Joseph D Chun
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Joseph D Chun for cholesterol management, blood pressure monitoring, arthritis follow-ups — no travel to Fullerton 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 Joseph D Chun
Dr. Chun is listed as active in the NPI registry with telehealth listed in Fullerton, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (714) 410-3100.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
Is this your profile?
Verify credentials, update practice details, and manage telehealth.
Medical Disclaimer: NPI Telehealth is a provider directory for informational purposes only. This page does not constitute medical advice, diagnosis, or treatment recommendations. Provider data is sourced from the CMS NPPES federal registry and public Medicare datasets. NPI Telehealth does not verify clinical qualifications beyond federal records. Data may not reflect real-time availability — always contact the provider's office directly to confirm details before seeking care.
Contact Joseph D Chun
Practice Location
1501 W Commonwealth Ave, Fullerton, CA 92833-2727
Mailing Address
Po Box 35380, Las Vegas, NV 89133-5380
This is a provider directory. Contact the office directly to schedule appointments.
Related Providers