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

Dr. Nathan Charles Nowalk, MD

Individual provider Sleep Medicine (Internal Medicine) Physician · NPI 1003298720

Dr. Nathan Charles Nowalk, MD is an Internal Medicine in Chicago, Illinois. Qualified in 2015, 11 years ago. Practices with University of Penn-Medical Group, a 3,401-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois and Pennsylvania.

Years since qualifying
11
Licensed in
IL, PA
In the registry since
2015
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

5841 S Maryland Ave
Chicago, IL 60637-1443
Phone: (888) 824-0200
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3624 Market St Ste 201, Philadelphia, PA 19104-2614 — (215) 662-7772

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence 036152140 (IL)
Sleep Medicine (Internal Medicine) Physician Taxonomy 207RS0012X · Licence MD490543 (PA)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence 036152140 (IL)

Record details

NPI number1003298720
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 18, 2015
Last updated in NPPESSeptember 10, 2025
Certification dateSeptember 10, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesPULMONARY DISEASE, SLEEP MEDICINE
Medical schoolOTHER
Graduated 2015 (11 years in practice)
Group practice University Of Penn-Medical Group — 3401 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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