Khai Do, M.D.
NPI 1396939526ActiveIndividual· Internal Medicine· Santa Ana, CA
Internal Medicine (M.D.) in Santa Ana, California, trained at Louisiana State University School of Medicine in New Orleans (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $1,618,000 for 10,461 claims, against $709.19 paid for services in 2024. Amgen Inc. was the largest of 15 companies reporting payments in 2025, $2,371 in all, mostly food and beverage.
Overview
| NPI | 1396939526 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 30, 2007 |
| Last updated in NPPES | Jun 23, 2026 |
| Certified by provider | Jun 23, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A42932 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 11 |
|---|---|
| Services billed | 12 across 3 procedure codes |
| Paid by Medicare | $709.19 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,461 · 21,303 30-day fills |
|---|---|
| Patients | 396 |
| Total drug cost | $1,618,000 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | Louisiana State University School of Medicine in New Orleans |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | General Practice |
Medical group
- Thien Phuoc Medical Center IncWestminster, CA · 2 clinicians
Other facilities
- Compassionate Health Hospice, IncHospice · Westminster, CA
Industry payments (Open Payments)
- 2025$2,371 · 93 payments from 15 companies
- 2024$1,440 · 58 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $433.67 | 22 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $402.47 | 18 |
| Bayer Healthcare Pharmaceuticals Inc. | $397.63 | 14 |
| Astrazeneca Pharmaceuticals LP | $270.89 | 9 |
| Axsome Therapeutics, Inc. | $256.58 | 7 |
What the 2025 payments were for
- Food and Beverage$2,371 · 93 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 72 internal medicine physicians in Santa Ana · All internal medicine physicians in California