Mark Siefring, MD
NPI 1245729870 · Internal Medicine Physician · Louisville, KY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Siefring, MD is a Internal Medicine Physician provider in Louisville, KY (NPI 1245729870).
Provider details
- NPI number
- 1245729870
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD203727 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
796 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 393 | $129 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 162 | $92 |
| Punch Biopsy, First Skin Growth11104 | 59 | $127 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 49 | $183 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 36 | $67 |
| Destruction of Precancer Skin Growth, 2-14 Growths |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 60 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 177 | 39 |
| Atorvastatin Calcium | 121 | 32 |
| Ketoconazole | 117 | 62 |
| Lisinopril | 103 | 25 |
| Losartan Potassium | 86 | 24 |
| Rosuvastatin Calcium | 81 | 27 |
| Mometasone Furoate | 80 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$35 across 2 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
- 2018-05-09
- Last updated
- 2025-08-11
- Certified
- 2025-08-11
Frequently asked questions
- What is Mark Siefring's NPI number?
- Mark Siefring's National Provider Identifier (NPI) is 1245729870, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Siefring's specialty?
- Mark Siefring is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Siefring located?
- Mark Siefring's practice location on file with NPPES is 1250 Bardstown Rd Ste 8, Louisville, KY 40204-1333.
- What is Mark Siefring's phone number?
- The practice phone number listed in the NPPES registry for Mark Siefring is (502) 456-7047.
- Does Mark Siefring accept Medicare?
- Mark Siefring is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Siefring's NPI active?
- Yes — Mark Siefring's NPI (1245729870) is active in the NPPES registry as of the last update on 2025-08-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.