Joseph Chun, M.D.
NPI 1710015425 · Allergy & Immunology Physician · Fullerton, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Chun, M.D. is a Allergy & Immunology Physician provider in Fullerton, CA (NPI 1710015425).
Provider details
- NPI number
- 1710015425
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G61950 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,157 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 297 | $139 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 212 | $62 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 175 | $98 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 122 | $140 |
| Advance Care Planning, First 30 Minutes99497 | 98 | $87 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 163 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 973 | 282 |
| Losartan Potassium | 885 | 250 |
| Amlodipine Besylate | 816 | 236 |
| Rosuvastatin Calcium | 605 | 199 |
| Metformin Hcl | 509 | 136 |
| Levothyroxine Sodium | 366 | 96 |
| Lipase/Protease/Amylase |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$38 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 6261 Stanton AveBuena Park, CA 90621-2436Phone: (714) 739-4325
Registry dates
- Enumerated
- 2007-03-02
- Last updated
- 2026-02-04
- Certified
- 2026-02-04
Frequently asked questions
- What is Joseph Chun's NPI number?
- Joseph Chun's National Provider Identifier (NPI) is 1710015425, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Chun's specialty?
- Joseph Chun is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Chun located?
- Joseph Chun's practice location on file with NPPES is 1501 W Commonwealth Ave, Fullerton, CA 92833-2727.
- What is Joseph Chun's phone number?
- The practice phone number listed in the NPPES registry for Joseph Chun is (714) 410-3100.
- Does Joseph Chun accept Medicare?
- Joseph Chun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Chun's NPI active?
- Yes — Joseph Chun's NPI (1710015425) is active in the NPPES registry as of the last update on 2026-02-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.