Dereje Siyum, MD
Dereje Siyum, MD is a Hospitalist Physician in Milwaukee, WI, registered under NPI 1164981007. This provider registers 5 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 945 N 12TH ST, Milwaukee, WI 53233. 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 |
|---|---|---|
| 74852 | WI | Hospitalist Physician primary |
| 74852-20 | WI | Obesity Medicine (Internal Medicine)… |
| 74852-20 | WI | Obesity Medicine (Preventive Medicine)… |
| 74852-20 | WI | Clinical Informatics Physician |
| 74852-20 | WI | Internal Medicine Physician |
This provider holds licence 74852 issued in WI. 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 - Hospitalist
- PAC ID
- 6305227802
- Enrollment ID
- I20220714002927
Medicare enrolment is recorded as approved under the provider type Practitioner - Hospitalist. 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 5 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 208M00000X | Hospitalist Physician | 74852 | WI | primary |
| 207RB0002X | Obesity Medicine (Internal Medicine) Physician Obesity Medicine | 74852-20 | WI | |
| 2083B0002X | Obesity Medicine (Preventive Medicine) Physician Obesity Medicine | 74852-20 | WI | |
| 2083C0008X | Clinical Informatics Physician Clinical Informatics | 74852-20 | WI | |
| 207R00000X | Internal Medicine Physician | 74852-20 | WI |
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 | 1164981007 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 19, 2019 |
| Last updated | May 17, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
945 N 12TH ST Milwaukee, WI 53233 (414) 219-7427 Fax (414) 219-6078 |
| Mailing address |
PO BOX 735044 Chicago, IL 60673 |
| Other identifiers |
100202312
· Medicaid (WI) |
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 | 1 | 6 | 4 | 9 | 8 | 1 | 0 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 3 | 4 | 9 | 8 | 2 | 0 | 0 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.