Karen Lin, MD
NPI 1538666813 · Internal Medicine Physician · Birmingham, AL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Lin, MD is a Internal Medicine Physician provider in Birmingham, AL (NPI 1538666813).
Provider details
- NPI number
- 1538666813
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD.38796 (AL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
517 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 194 | $72 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 180 | $107 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 89 | $103 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 54 | $146 |
Typical Medicare-allowed amounts for these services range $72–$146 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 18 | 16 |
| Apixabanbrand: Eliquis | 17 | 11 |
| Pantoprazole Sodium | 16 | 16 |
| Atorvastatin Calcium | 14 | 14 |
| Hydralazine Hcl | 13 | 13 |
| Levofloxacin | 12 | 12 |
| Prednisone | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$183 across 8 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-12
- Last updated
- 2021-05-11
- Certified
- 2021-05-11
Frequently asked questions
- What is Karen Lin's NPI number?
- Karen Lin's National Provider Identifier (NPI) is 1538666813, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Lin's specialty?
- Karen Lin is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Lin located?
- Karen Lin's practice location on file with NPPES is 817 Princeton Ave Sw Ste 106, Birmingham, AL 35211-1340.
- What is Karen Lin's phone number?
- The practice phone number listed in the NPPES registry for Karen Lin is (205) 971-5745.
- Does Karen Lin accept Medicare?
- Karen Lin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Lin's NPI active?
- Yes — Karen Lin's NPI (1538666813) is active in the NPPES registry as of the last update on 2021-05-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.