Stephen En Ling, M.D.
NPI 1841337045ActiveIndividual· Internal Medicine· Mountain View, CA
Internal Medicine (M.D.) in Mountain View, California, trained at University of California, Davis School of Medicine (class of 1986). Their prescriptions cost Medicare Part D more than their services did: $163,354 for 3,540 claims, against $1,648 paid for services in 2024.
Overview
| NPI | 1841337045 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jan 30, 2007 |
| Last updated in NPPES | Feb 11, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G61961 | 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 | 15 |
|---|---|
| Services billed | 35 across 10 procedure codes |
| Paid by Medicare | $1,648 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,540 · 9,535 30-day fills |
|---|---|
| Patients | 460 |
| Total drug cost | $163,354 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | University of California, Davis School of Medicine |
|---|---|
| Graduation year | 1986 |
| Medicare specialty | Internal Medicine |
Medical group
- Permanente Medical Group IncOakland, CA · 10,996 clinicians
Hospital affiliation
- Kaiser Foundation Hospital-Santa ClaraSanta Clara, CA
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 134 internal medicine physicians in Mountain View · All internal medicine physicians in California