Ahsan Wahab, MD
Ahsan Wahab, MD is a Hospitalist Physician in Chicago, IL, registered under NPI 1548644180. 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 840 S WOOD ST, Chicago, IL 60612. 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 |
|---|---|---|
| 036164046 | IL | Hospitalist Physician primary |
| 036164046 | IL | Internal Medicine Physician |
This provider holds licence 036164046 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 - Hematology
- PAC ID
- 0042512816
Enrolled in Medicare 4 times, across 3 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| North Carolina | I20220802002887 | Practitioner - Hematology |
| Illinois | I20250711003027 | Practitioner - Internal Medicine |
| Illinois | I20250808000092 | Practitioner - Hospitalist |
| Indiana | I20250808004012 | Practitioner - Hospitalist |
Medicare enrolment is recorded as approved under the provider type Practitioner - Hematology. There are 4 separate enrolment records across 3 states (NC, IL, IN). 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.
What Hospitalist covers
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients. NUCC Health Care Provider Taxonomy, code 208M00000X
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 | |
|---|---|---|---|---|
| 208M00000X | Hospitalist Physician | 036164046 | IL | primary |
| 207R00000X | Internal Medicine Physician | 036164046 | 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 | 1548644180 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 14, 2015 |
| Last updated | Jul 30, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
840 S WOOD ST Chicago, IL 60612 (312) 996-5680 |
| Mailing address |
637 E WOODLAND PARK AVE APT 107 Chicago, IL 60616 |
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 | 5 | 4 | 8 | 6 | 4 | 4 | 1 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 8 | 8 | 3 | 4 | 8 | 1 | 7 |
Sum = 70 · next multiple of 10 = 70 · 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.