Eugene Yoon, M.D.
NPI 1861618449 · Gastroenterology Physician · Fullerton, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Eugene Yoon, M.D. is a Gastroenterology Physician provider in Fullerton, CA (NPI 1861618449).
Provider details
- NPI number
- 1861618449
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A81190 (CA)
Specialties & taxonomies
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
814 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) |
|---|---|---|
| Moderate Sedation Services Provided By the Same Physician Or Other Qualified Health Care Professional Performing a Gastrointestinal Endoscopic Service That Sedation Supports, Requiring the Presence of an Independent Trained Observer to Assist in the MonitoG0500 | 185 | $6 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 98 | $136 |
| Diagnostic Exam of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43235 | 79 | $105 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 78 | $257 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 72 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 215 | 82 |
| Nortriptyline Hcl | 93 | 29 |
| Pantoprazole Sodium | 57 | 25 |
| Mesalamine | 54 | 12 |
| Dicyclomine Hcl | 40 | 21 |
| Colestipol Hcl | 31 | 14 |
| Sucralfate | 25 | — |
| Ondansetronbrand: Ondansetron Odt |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,756 across 78 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
Registry dates
- Enumerated
- 2007-04-18
- Last updated
- 2024-10-24
- Certified
- 2024-10-22
Frequently asked questions
- What is Eugene Yoon's NPI number?
- Eugene Yoon's National Provider Identifier (NPI) is 1861618449, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Eugene Yoon's specialty?
- Eugene Yoon is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Eugene Yoon located?
- Eugene Yoon's practice location on file with NPPES is 1837 Sunny Crest Dr, Fullerton, CA 92835-3616.
- What is Eugene Yoon's phone number?
- The practice phone number listed in the NPPES registry for Eugene Yoon is (714) 446-5831.
- Does Eugene Yoon accept Medicare?
- Eugene Yoon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Eugene Yoon's NPI active?
- Yes — Eugene Yoon's NPI (1861618449) is active in the NPPES registry as of the last update on 2024-10-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.