Douglas Long Nguyen, MD
NPI 1184880114ActiveIndividual· Internal Medicine, Gastroenterology· Mission Viejo, CA
Internal Medicine, Gastroenterology (MD) in Mission Viejo, California, trained at Cincinnati College of Medicine and Surgery (class of 2008). Their prescriptions cost Medicare Part D more than their services did: $1,957,924 for 1,654 claims, against $113,891 paid for services in 2024. Abbvie Inc. was the largest of 23 companies reporting payments in 2025, $406,320 in all, mostly speaking and faculty fees.
Overview
| NPI | 1184880114 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 30, 2008 |
| Last updated in NPPES | May 12, 2022 |
| Certified by provider | May 12, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A113814 | CA |
| Internal Medicine | 207R00000X | A113814 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 318 |
|---|---|
| Services billed | 946 across 41 procedure codes |
| Paid by Medicare | $113,891 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,654 · 2,621 30-day fills |
|---|---|
| Patients | 466 |
| Total drug cost | $1,957,924 |
| Generic share | 74% of claims |
Education and affiliations
| Medical school | Cincinnati College of Medicine and Surgery |
|---|---|
| Graduation year | 2008 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliations
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
- Providence Mission HospitalMission Viejo, CA
Industry payments (Open Payments)
- 2025$406,320 · 546 payments from 23 companies
- 2024$486,934 · 667 payments from 25 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $127,353 | 130 |
| Janssen Biotech, Inc. | $114,533 | 141 |
| Lilly USA, LLC | $97,580 | 111 |
| Celltrion USA Inc. | $35,609 | 37 |
| Pfizer Inc. | $26,217 | 34 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$299,488 · 82 payments
- Travel and Lodging$48,821 · 136 payments
- Honoraria$29,748 · 10 payments
- Consulting Fee$17,280 · 9 payments
- Food and Beverage$10,984 · 309 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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