Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

John Mark Flack, MD, MPH

Individual provider Internal Medicine Physician · NPI 1164450987

John Mark Flack, MD, MPH is an Internal Medicine in Springfield, Illinois. Qualified in 1982, 44 years ago. Practices with SIU Physicians and Surgeons Inc, a 316-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
44
Licensed in
IL
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
MPH — Master of Public Health
A graduate degree in population health.

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Practice location Address checks out

751 N Rutledge St Ste 1100
Springfield, IL 62702-4968
Phone: (217) 545-8000
Fax: (217) 545-4735
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hypertension Specialist Physician (primary) Taxonomy 207RH0005X · Licence 036-138254 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036-138254 (IL)

Record details

NPI number1164450987
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , MPH
Sole proprietorNo
NPI enumeratedJune 29, 2006
Last updated in NPPESOctober 21, 2020
Certification dateOctober 21, 2020
Mailing addressPo Box 19636, Springfield, IL 62794-9636

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1982 (44 years in practice)
Group practice Siu Physicians And Surgeons Inc — 316 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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