John Flack, MD, MPH
John Flack, MD, MPH is a Hypertension Specialist Physician in Springfield, IL, registered under NPI 1164450987. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 751 N RUTLEDGE ST SUITE 1100, Springfield, IL 62702. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 036-138254 | IL | Hypertension Specialist Physician primary |
| 036-138254 | IL | Internal Medicine Physician |
This provider holds licence 036-138254 issued in IL. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 2264344688
- Enrollment ID
- I20150819007418
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Hypertension Specialist covers
A Hypertension Specialist is a physician who concentrates on all aspects of the diagnosis and treatment of hypertension. NUCC Health Care Provider Taxonomy, code 207RH0005X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RH0005X | Hypertension Specialist Physician Hypertension Specialist | 036-138254 | IL | primary |
| 207R00000X | Internal Medicine Physician | 036-138254 | IL |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1164450987 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 29, 2006 |
| Last updated | Oct 21, 2020 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD, MPH |
| Practice address |
751 N RUTLEDGE ST SUITE 1100 Springfield, IL 62702 (217) 545-8000 Fax (217) 545-4735 |
| Mailing address |
PO BOX 19636 Springfield, IL 62794 |
| Other identifiers |
036138254
· Medicaid (IL) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 1 | 6 | 4 | 4 | 5 | 0 | 9 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 3 | 4 | 8 | 5 | 0 | 9 | 7 |
Sum = 63 · next multiple of 10 = 70 · check digit = 7 · actual last digit = 7
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.