Diane Heidmann, MD
Diane Heidmann, MD is an Internal Medicine Physician in Chicago, IL, registered under NPI 1003100629.
Getting there
Here is what surrounds this office in Chicago, based on OpenStreetMap data collected Aug 29, 2026. Parking is available about 468 ft away at Erie Ontario Parking D. There is EV charging 0.42 mi from the office (EVgo) — useful if you are driving in from out of town. The nearest transit stop is 303 ft away, served by Ontario & Fairbanks. A pharmacy sits 0.24 mi from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 434 ft away.
Getting here and what is nearby
Parking Northwest University Parking B 0.00 mi ~1 min
259 East Erie Street, 60611
Restaurant Ron of Japan 114 ft ~1 min
230 East Ontario Street, Chicago 60611
Transit Ontario & Fairbanks 147 ft ~1 min
Coffee Do - Rite Donuts & Chicken 157 ft ~1 min
Coffee Stan's Donuts & Coffee 166 ft ~1 min
Restaurant CAVA 159 ft ~1 min
270 East Ontario Street, Chicago 60611
Restaurant The Albert 174 ft ~1 min
Transit Fairbanks & Erie 232 ft ~1 min
Hotel Hotel EMC2 188 ft ~1 min
228 East Ontario Street, Chicago 60611
Hotel Aloft Chicago - Magnificent Mile 249 ft ~1 min
237 East Ontario Street, Chicago 60611
Hotel Fairfield Inn & Suites Chicago Downtown/Magnificent Mile 255 ft ~1 min
Transit Ontario & Fairbanks 303 ft ~2 min
Parking Erie Ontario Parking C 313 ft ~2 min
321 East Erie Street
Coffee Starbucks 434 ft ~2 min
Parking Erie Ontario Parking D 468 ft ~2 min
328 East Ontario Street, Chicago 60611
Convenience 7-Eleven 654 ft ~3 min
Grocery Bockwinkel's 667 ft ~3 min
Grocery Whole Foods Market 803 ft ~4 min
255 East Grand Avenue, Chicago 60611
Mo-Su 08:00-22:00
Convenience 7-Eleven 870 ft ~4 min
Pharmacy Walgreens 0.22 mi ~5 min
Pharmacy Walgreens 0.24 mi ~5 min
680 North Lake Shore Drive, Chicago 60611
Pharmacy Walgreens 0.24 mi ~5 min
Grocery Trader Joe's 0.27 mi ~6 min
44 East Ontario Street, Chicago 60611
Mo-Su 08:00-21:00
Convenience 7-Eleven 0.34 mi ~7 min
EV charging EVgo 0.42 mi ~9 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 125-059287 | IL | Internal Medicine Physician |
| 036135078 | IL | Internal Medicine Physician primary |
This provider holds licence 125-059287 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
- 3072738830
- Enrollment ID
- I20140710002092
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 Internal Medicine covers
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs. NUCC Health Care Provider Taxonomy, code 207R00000X
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 | |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | 125-059287 | IL | |
| 207R00000X | Internal Medicine Physician | 036135078 | IL | primary |
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 | 1003100629 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 31, 2011 |
| Last updated | May 12, 2016 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | MD |
| Practice address |
259 E ERIE ST SUITE 2230 Chicago, IL 60611 (312) 926-6000 Fax (312) 926-8267 |
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 | 0 | 0 | 3 | 1 | 0 | 0 | 6 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 0 | 0 | 6 | 4 |
Sum = 41 · next multiple of 10 = 50 · check digit = 9 · actual last digit = 9
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.