Chimuanya Okoli, MD
Chimuanya Okoli, MD is a Sleep Medicine (Internal Medicine) Physician in Chicago, IL, registered under NPI 1003444779. This provider registers 2 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 4, 2026. Parking is available about 313 ft away at Wellington Garage. There is EV charging 0.41 mi from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 979 ft away, served by Halsted & George. A pharmacy sits 0.30 mi from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 630 ft away.
Getting here and what is nearby
Parking South Parking 70 ft ~1 min
931-937 West Wellington Avenue, Chicago 60657
Parking 171 ft ~1 min
Parking Wellington Garage 313 ft ~2 min
Coffee Courtyard Café 446 ft ~2 min
Pharmacy Advocate Pharmacy 434 ft ~2 min
Mo-Fr 08:30-18:00
Restaurant Rendezvous Café 440 ft ~2 min
06:30-10:30,11:00-14:30,16:30-18:30
Restaurant DMK Burger Bar 477 ft ~2 min
2954 North Sheffield Avenue, Chicago 60657
Mo-Th 11:30-23:00; Fr-Su 11:30-00:00
Restaurant Fish Bar 481 ft ~2 min
2956 North Sheffield Avenue, Chicago 60657
Su-Th 11:30-22:00; Fr,Sa 11:30-23:00
Coffee Panes Bread Cafe 516 ft ~2 min
3002 North Sheffield Avenue, Chicago 60657
Mo-Fr 09:00-21:00; Sa-Su 10:00-21:00
Coffee Ecos Café 630 ft ~3 min
Transit Halsted & Wellington 869 ft ~4 min
Transit Halsted & Wellington 937 ft ~4 min
Pharmacy Walgreens 970 ft ~4 min
Transit Halsted & George 979 ft ~4 min
Convenience 7-Eleven 0.23 mi ~5 min
Hotel City Suites Hotel 0.26 mi ~6 min
933 West Belmont Avenue, Chicago 60657
Grocery The Fresh Market 0.28 mi ~6 min
Pharmacy Walgreens 0.30 mi ~7 min
Convenience Circle K 0.37 mi ~8 min
1162 West Diversey Parkway, Chicago 60657
EV charging 0.38 mi ~8 min
Gas station Shell 0.38 mi ~8 min
1162 West Diversey Parkway, Chicago 60657
Convenience 7-Eleven 0.40 mi ~9 min
Grocery Trader Joe's 0.40 mi ~8 min
667 West Diversey Parkway, Chicago 60614
Mo-Su 09:00-21:00
EV charging Tesla Supercharger 0.41 mi ~9 min
Hotel Hotel Versey 0.41 mi ~9 min
Grocery Mariano's Fresh Market 0.41 mi ~9 min
Hotel The Willows 0.48 mi ~10 min
555 West Surf Street, Chicago 60657
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 |
|---|---|---|
| 94081 | SC | Sleep Medicine (Internal Medicine)… primary |
| 125.076689 | IL | Internal Medicine Physician |
Licences are recorded in 2 states: SC, IL. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Sleep Medicine
- PAC ID
- 6406211333
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Ohio | I20241019000299 | Practitioner - Sleep Medicine |
| South Carolina | I20250710000212 | Practitioner - Internal Medicine |
Medicare enrolment is recorded as approved under the provider type Practitioner - Sleep Medicine. There are 2 separate enrolment records across 2 states (OH, SC). 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 South Carolina. 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
- 125.076689
- Specialty
- Internal Medicine Physician
- Licence
- 94081
- 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 Sleep Medicine covers
An Internist who practices Sleep Medicine is certified in the subspecialty of sleep medicine and specializes in the clinical assessment, physiologic testing, diagnosis, management and prevention of sleep and circadian rhythm disorders. Sleep specialists treat patients of any age and use multidisciplinary approaches. Disorders managed by sleep specialists include, but are not limited to, sleep related breathing disorders, insomnia, hypersomnias, circadian rhythm sleep disorders, parasomnias and sleep related movement disorders. NUCC Health Care Provider Taxonomy, code 207RS0012X
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 | |
|---|---|---|---|---|
| 207RS0012X | Sleep Medicine (Internal Medicine) Physician Sleep Medicine | 94081 | SC | primary |
| 207R00000X | Internal Medicine Physician | 125.076689 | 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 | 1003444779 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 30, 2020 |
| Last updated | Aug 12, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | MD |
| Practice address |
836 W WELLINGTON AVE Chicago, IL 60657 (773) 296-5424 |
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 | 4 | 4 | 4 | 7 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 4 | 8 | 7 | 5 |
Sum = 61 · next multiple of 10 = 70 · 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.