Karen Lin, MD
NPI 1538666813ActiveIndividual· Internal Medicine· Birmingham, AL
Internal Medicine (MD) with Oak Mountain Group Services, LLC, practicing in Birmingham, Alabama. In 2024 Medicare paid $44,466 for 168 patients, and Part D covered 400 of their prescriptions, 87% of them generic. Pfizer Inc. was the largest of 7 companies reporting payments in 2025, $440.43 in all, mostly food and beverage. Lists Grandview Medical Center as a hospital affiliation.
Overview
| NPI | 1538666813 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 12, 2018 |
| Last updated in NPPES | May 11, 2021 |
| Certified by provider | May 11, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MD.38796 | AL |
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 (AL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 168 |
|---|---|
| Services billed | 554 across 10 procedure codes |
| Paid by Medicare | $44,466 |
Part D prescriptions in 2024
| Prescriptions (claims) | 400 · 528 30-day fills |
|---|---|
| Patients | 159 |
| Total drug cost | $35,169 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Oak Mountain Group Services, LLCBirmingham, AL · 61 clinicians
Hospital affiliation
- Grandview Medical CenterBirmingham, AL
Industry payments (Open Payments)
- 2025$440.43 · 23 payments from 7 companies
- 2024$182.82 · 8 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $174.21 | 10 |
| Abbvie Inc. | $112.62 | 5 |
| Gilead Sciences, Inc. | $56.35 | 3 |
| Melinta Therapeutics, LLC | $44.14 | 2 |
| Bayer Healthcare Pharmaceuticals Inc. | $22.29 | 1 |
What the 2025 payments were for
- Food and Beverage$440.43 · 23 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 574 internal medicine physicians in Birmingham · All internal medicine physicians in Alabama