Nathan Nowalk, M.D.
Nathan Nowalk, M.D. is a Pulmonary Disease Physician in Chicago, IL, registered under NPI 1003298720. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Chicago, based on OpenStreetMap data collected Sep 3, 2026. Parking is available about 0.27 mi away at Medical Campus Parking Garage B. There is EV charging 0.24 mi from the office (ChargePoint) — useful if you are driving in from out of town. The nearest transit stop is 513 ft away, served by 59th Street & Drexel. If you arrive early, there is a coffee shop 0.27 mi away.
Getting here and what is nearby
EV charging ChargePoint 287 ft ~2 min
Parking Parking/Materials Management 289 ft ~2 min
5835 South Cottage Grove Avenue, Chicago 60637
Restaurant Panera Bread 360 ft ~2 min
Transit Cottage Grove & 59th Street 479 ft ~2 min
Transit Cottage Grove & 59th Street 504 ft ~2 min
Transit 59th Street & Drexel 513 ft ~2 min
Restaurant Panera Bread 824 ft ~4 min
5721 South Maryland Avenue, Chicago 60637
Mo-Fr 07:00-18:00
Coffee French Press Coffee 918 ft ~4 min
970 East 58th Street, Chicago 60637
mo-fr 08:00-20:00 sa-su 09:00-18:00
Restaurant Burrito Beach 0.21 mi ~5 min
Coffee Grounds of Being 0.24 mi ~5 min
1025 East 58th Street, Chicago 60637
EV charging ChargePoint 0.24 mi ~5 min
Parking Campus South Parking 0.24 mi ~5 min
Coffee Harper Cafe 0.27 mi ~6 min
Parking Medical Campus Parking Garage B 0.27 mi ~6 min
5656 South Maryland Avenue, Chicago 60637
Convenience Midway Market 0.30 mi ~6 min
Grocery Jewel-Osco 0.30 mi ~6 min
6014 South Cottage Grove Avenue, Chicago 60637
Mo-Su 06:00-22:00
Convenience Maroon Market 0.39 mi ~8 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 |
|---|---|---|
| 036152140 | IL | Pulmonary Disease Physician primary |
| MD490543 | PA | Sleep Medicine (Internal Medicine)… |
| 036152140 | IL | Critical Care Medicine (Internal… |
Licences are recorded in 2 states: IL, PA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Pulmonary Disease
- PAC ID
- 8224373873
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Illinois | I20250319000657 | Practitioner - Pulmonary Disease |
| Pennsylvania | I20251104003179 | Practitioner - Internal Medicine |
Medicare enrolment is recorded as approved under the provider type Practitioner - Pulmonary Disease. There are 2 separate enrolment records across 2 states (IL, PA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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.
Licensed in 2 states
This provider holds licences in 2 states: Illinois and Pennsylvania. The practice address on file is in Chicago, IL, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 036152140
- Specialty
- Pulmonary Disease Physician
- Licence
- MD490543
- Specialty
- Sleep Medicine (Internal Medicine)…
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Pulmonary Disease covers
An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs. NUCC Health Care Provider Taxonomy, code 207RP1001X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RP1001X | Pulmonary Disease Physician Pulmonary Disease | 036152140 | IL | primary |
| 207RS0012X | Sleep Medicine (Internal Medicine) Physician Sleep Medicine | MD490543 | PA | |
| 207RC0200X | Critical Care Medicine (Internal Medicine) Physician Critical Care Medicine | 036152140 | 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 | 1003298720 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 18, 2015 |
| Last updated | Sep 10, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | M.D. |
| Practice address |
5841 S MARYLAND AVE Chicago, IL 60637 (888) 824-0200 |
| Mailing address |
150 HARVESTER DR STE 300 Burr Ridge, IL 60527 |
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 | 2 | 9 | 8 | 7 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 9 | 7 | 7 | 4 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.