Mark Charles Vlasak, M.D.
Internal Medicine Physician · Collierville, TN
Mark Charles Vlasak, M.D. is an internal medicine physician with a practice address in Collierville, Tennessee, and NPI 1356341762, issued on Jul 28, 2005. Check the license (Tennessee MD17221, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mark Charles Vlasak
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD17221 TN
Self-reported in NPPES; status is on the state search - Practice location
- 1164 W Poplar Ave, Collierville, TN 38017
- Phone
- (901) 853-5551
- Enumerated
- Jul 28, 2005
- Record last updated
- May 21, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (901) 853-7303
- Medicare enrollment
- Enrolled (PECOS I20101206000985); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At Houston, 1983
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,596 in Tennessee → Look up another NPI →
Verify Mark Charles Vlasak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license MD17221Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% more Medicare Part D claims than the average internal medicine physician in 2024
5,473 Medicare Part D claims for 380 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 95 claims were for opioids.
Most prescribed
- Levothyroxine Sodium251 claims
- Amlodipine Besylate227 claims
- Losartan Potassium176 claims
- Simvastatin164 claims
- Atorvastatin Calcium158 claims
- Omeprazole140 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: $17.72
1 payment: food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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.
Mark Charles Vlasak among 2,596 internal medicine physician records in Tennessee
Mark Charles Vlasak, M.D. is one of 2,596 internal medicine physician records with a practice address in Tennessee. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1983 · median 2003 among the 1,705 with a school on file
- Record last updated2008 · 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 Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 internal medicine physician records list a practice address in Collierville
They are 17 of the 548 NPPES records with a practice address in Collierville, and 2,596 internal medicine physician records in Tennessee.
All 2,596 in Tennessee → Every provider in Collierville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joan Allmon, M.D.Collierville, TN 380171073516852
- Scott Boone, MDCollierville, TN 380171487674644
- Kristy Bryan, M.D.Collierville, TN 380171316996572
- Nicholas DiloretoCollierville, TN 380171619530797
- Gina Hanissian, MDCollierville, TN 380171710053327
- Keerthi HeckleCollierville, TN 380171730523986
- Owita Mays, MDCollierville, TN 380171215930094
- John O Connell, MDCollierville, TN 380171851479059
Common questions
What is Mark Charles Vlasak, M.D.'s NPI number?
Mark Charles Vlasak, M.D.'s National Provider Identifier (NPI) is 1356341762, issued on Jul 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Charles Vlasak, M.D. located?
The NPPES record lists a practice address at 1164 W Poplar Ave, Collierville, TN, 38017. Phone: (901) 853-5551. Providers update this record themselves, so call before visiting.
How can I verify Mark Charles Vlasak, M.D.'s license?
NPPES lists Tennessee license number MD17221, as entered by the provider. Search the Tennessee Board of Medical Examiners at https://www.tn.gov/health/licensure/me.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Charles Vlasak, M.D. prescribe under Medicare Part D?
In 2024, Mark Charles Vlasak, M.D. had 5,473 Medicare Part D claims for 380 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.