Mark Vlasak, M.D.
NPI 1356341762 · Internal Medicine Physician · Collierville, TN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Vlasak, M.D. is a Internal Medicine Physician provider in Collierville, TN (NPI 1356341762).
Provider details
- NPI number
- 1356341762
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD17221 (TN)
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
20 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
1,566 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 | 543 | $118 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 487 | $9 |
| Urinalysis, Manual Test81002 | 162 | $3 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 140 | $13 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 83 | $116 |
| X-Ray of Chest, 2 Views71046 | 45 | $30 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 113 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 251 | 70 |
| Amlodipine Besylate | 227 | 62 |
| Losartan Potassium | 176 | 56 |
| Simvastatin | 164 | 44 |
| Atorvastatin Calcium | 158 | 45 |
| Omeprazole | 140 | 48 |
| Alprazolam | 110 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$18 across 1 record (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
- 2005-07-28
- Last updated
- 2008-05-21
Frequently asked questions
- What is Mark Vlasak's NPI number?
- Mark Vlasak's National Provider Identifier (NPI) is 1356341762, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Vlasak's specialty?
- Mark Vlasak is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Vlasak located?
- Mark Vlasak's practice location on file with NPPES is 1164 W Poplar Ave, Collierville, TN 38017-3196.
- What is Mark Vlasak's phone number?
- The practice phone number listed in the NPPES registry for Mark Vlasak is (901) 853-5551.
- Does Mark Vlasak accept Medicare?
- Mark Vlasak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Vlasak's NPI active?
- Yes — Mark Vlasak's NPI (1356341762) is active in the NPPES registry as of the last update on 2008-05-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.