Terrence Charles Tan, D.O.
NPI 1851622435ActiveIndividual· Internal Medicine· Colton, CA
Internal Medicine (D.O.) with Southern California Permanente Medical Group, practicing in Colton, California. Their prescriptions cost Medicare Part D more than their services did: $1,767,620 for 2,082 claims, against $1,099 paid for services in 2024.
Overview
| NPI | 1851622435 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | Yes |
| NPI issued | Jan 21, 2010 |
| Last updated in NPPES | Nov 18, 2021 |
| Certified by provider | Nov 18, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 20A11111 | 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 - Rheumatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 12 |
|---|---|
| Services billed | 22 across 10 procedure codes |
| Paid by Medicare | $1,099 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,082 · 5,131 30-day fills |
|---|---|
| Patients | 512 |
| Total drug cost | $1,767,620 |
| Generic share | 76% of claims |
Education and affiliations
| Graduation year | 2008 |
|---|---|
| Medicare specialty | Rheumatology |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 71 internal medicine physicians in Colton · All internal medicine physicians in California