Doctor profile · Federal record
Dr. Olwen Hahn, M.D.
Hematology & Oncology Physician (CMS: Hematology/Oncology) · Chicago, IL
- NPI 1992823611
- Accepts Medicare
- MIPS 87.7 / 100 · 2023
- 25 yrs in practice
- Female
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
5841 S Maryland Ave, Mc 2115
Chicago, IL 606371447
(773) 702-5381
fax (773) 702-3163
Credentials & registration
- NPI registered
- March 2007 — 19 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 2001 — 25 yrs since
- Specialty taxonomy
- 207RH0003X — NUCC code
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1992823611. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
253
Distinct HCPCS
3
Medicare allowed
$38,023
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 143 | 74 | $150 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 57 | 24 | $125 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 53 | 52 | $179 |
In context: peer comparison
Among 77 peers in this city , average services per provider: 870. This provider delivers 0.3× the peer median.Open Payments
Industry payments received
All-time total
$1,737
Transactions
11
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| AstraZeneca UK Limited | 11 | $1,736.99 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
363
Patients
90
Total drug cost
$1,443,972
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Anastrozole | Generic | 154 | 50 | $4,845 |
| Letrozole | Generic | 39 | 16 | $2,193 |
| Exemestane | Generic | 35 | 11 | $5,778 |
| Tamoxifen Citrate | Generic | 33 | 13 | $1,111 |
| Verzenio (Abemaciclib) | Brand | 28 | 0 | $304,330 |
| Kisqali (Ribociclib Succinate) | Brand | 22 | 0 | $339,626 |
| Ibrance (Palbociclib) | Brand | 16 | 0 | $257,896 |
| Piqray (Alpelisib) | Brand | 14 | 0 | $282,231 |
| Orserdu (Elacestrant Hcl) | Brand | 11 | 0 | $238,663 |
| Xarelto (Rivaroxaban) | Brand | 11 | 0 | $7,299 |
Frequently asked questions
What is Dr. Olwen Hahn's medical specialty?
Dr. Olwen Hahn practices Hematology & Oncology Physician in Chicago, IL.
Where does Dr. Olwen Hahn practice?
Dr. Olwen Hahn practices at 5841 S Maryland Ave, Chicago, IL 606371447. Office phone: 7737025381.
What is Dr. Olwen Hahn's NPI?
Dr. Olwen Hahn's National Provider Identifier (NPI) is 1992823611, issued by NPPES.
Does Dr. Olwen Hahn accept Medicare assignment?
Yes. Dr. Olwen Hahn accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Olwen Hahn commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99215); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.