Mark Louis Siefring, MD
Internal Medicine Physician · Louisville, KY
Mark Louis Siefring, MD is an internal medicine physician with a practice address in Louisville, Kentucky, and NPI 1245729870, issued on May 9, 2018. Check the license (Kentucky 34079, as entered in NPPES) on the Kentucky Board of Medical Licensure; the Medicare figures below come from public CMS files.
- Name
- Mark Louis Siefring
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 34079 KY
MD203727 OR
Self-reported in NPPES; status is on the state search - Practice location
- 1250 Bardstown RD Ste 8, Louisville, KY 40204
- Phone
- (502) 456-7047
- Enumerated
- May 9, 2018
- Record last updated
- Aug 11, 2025
- Fax
- (502) 452-1491
- Medicare enrollment
- Enrolled (PECOS I20191213000891); accepts Medicare assignment
- Medical or professional school
- University Of Louisville School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,526 in Kentucky → Look up another NPI →
Also registered at 1250 Bardstown RD Ste 8
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Liane Dean, APRNFamily Nurse Practitioner1487904637
- Katelyn Thompson, APRNFamily Nurse Practitioner1629755749
- Kari Zahorik, M.D.Family Medicine Physician1134296304
Verify Mark Louis Siefring in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersKentucky Board of Medical Licensure
Search for license 34079Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,777 Medicare Part D claims for 324 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 49 claims were for opioids.
Most prescribed
- Levothyroxine Sodium177 claims
- Atorvastatin Calcium121 claims
- Ketoconazole117 claims
- Lisinopril103 claims
- Losartan Potassium86 claims
- Rosuvastatin Calcium81 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $34.58
2 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Community Medical Associates IncLouisville, KY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Louis Siefring among 1,526 internal medicine physician records in Kentucky
Mark Louis Siefring, MD is one of 1,526 internal medicine physician records with a practice address in Kentucky. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 81% of them.
- NPI issued2018 · 81% of these records are older, 16% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1995 · median 2006 among the 1,025 with a school on file
- Record last updated2025 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Kentucky practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
457 internal medicine physician records list a practice address in Louisville
They are 457 of the 21,891 NPPES records with a practice address in Louisville, and 1,526 internal medicine physician records in Kentucky.
All 1,526 in Kentucky → Every provider in Louisville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ian Anderson, MDLouisville, KY 402041346409109
- Mary Barry, M.D.Louisville, KY 402041154386670
- Jerry Benfield, MDLouisville, KY 402041437133121
- Sylvia Cole, MDLouisville, KY 402041013972561
- Kevin Curran, M.D.Louisville, KY 402041922063486
- Jignesh Desai, M.D.Louisville, KY 402041265857114
- Shannon Lynn, MDLouisville, KY 402041700840535
- Debra Marshall, M.D.Louisville, KY 402041053394544
Common questions
What is Mark Louis Siefring, MD's NPI number?
Mark Louis Siefring, MD's National Provider Identifier (NPI) is 1245729870, issued on May 9, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Mark Louis Siefring, MD located?
The NPPES record lists a practice address at 1250 Bardstown RD Ste 8, Louisville, KY, 40204. Phone: (502) 456-7047. Providers update this record themselves, so call before visiting.
How can I verify Mark Louis Siefring, MD's license?
NPPES lists Kentucky license number 34079, as entered by the provider. Search the Kentucky Board of Medical Licensure at https://web1.ky.gov/GenSearch/LicenseSearch.aspx?AGY=5. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Louis Siefring, MD prescribe under Medicare Part D?
In 2024, Mark Louis Siefring, MD had 2,777 Medicare Part D claims for 324 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.