John Mark Flack, MD, MPH
Hypertension Specialist Physician · Springfield, IL
John Mark Flack, MD, MPH is a hypertension specialist physician with a practice address in Springfield, Illinois, and NPI 1164450987, issued on Jun 29, 2006. Check the license (Illinois 036-138254, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John Mark Flack
- Credential
- MD, MPH
- Primary taxonomy
- Hypertension Specialist Physician 207RH0005X
- License number
- 036-138254 IL
Self-reported in NPPES; status is on the state search - Practice location
- 751 N Rutledge St, Springfield, IL 62702
- Phone
- (217) 545-8000
- Enumerated
- Jun 29, 2006
- Record last updated
- Oct 21, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (217) 545-4735
- Medicaid ID
- 036138254 IL
- Medicare enrollment
- Enrolled (PECOS I20150819007418); accepts Medicare assignment
- Entity
- Type 1 · individual
All 1 in Illinois → Look up another NPI →
Also registered at 751 N Rutledge St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Mark Flack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-138254Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average hypertension specialist physician in 2024
1,350 Medicare Part D claims for 171 beneficiaries, against an average of 3,198 among the 13 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Olmesartan Medoxomil223 claims
- Chlorthalidone140 claims
- Amlodipine Besylate127 claims
- Allopurinol126 claims
- Indapamide108 claims
- Metoprolol Succinate78 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: $61,684.14
26 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 10 providers of this specialty with any payment received $49,050.93 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
- Siu Physicians And Surgeons IncSpringfield, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hypertension Specialist Physician providers in Illinois
There are 1 hypertension specialist physician records in Illinois.
All 1 in Illinois → Every provider in Springfield → Hypertension Specialist Physician nationwide →
Common questions
What is John Mark Flack, MD, MPH's NPI number?
John Mark Flack, MD, MPH's National Provider Identifier (NPI) is 1164450987, issued on Jun 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Mark Flack, MD, MPH located?
The NPPES record lists a practice address at 751 N Rutledge St, Springfield, IL, 62702. Phone: (217) 545-8000. Providers update this record themselves, so call before visiting.
How can I verify John Mark Flack, MD, MPH's license?
NPPES lists Illinois license number 036-138254, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Mark Flack, MD, MPH prescribe under Medicare Part D?
In 2024, John Mark Flack, MD, MPH had 1,350 Medicare Part D claims for 171 beneficiaries; the average among hypertension specialist physician prescribers was 3,198. 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.