Doctor profile · Federal record
Dr. Chang-Gyu Hahn, MD
Psychiatry Physician (CMS: Psychiatry) · Philadelphia, PA
- NPI 1558472100
- Accepts Medicare
- 45 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3535 Market St, 3Rd Floor
Philadelphia, PA 191043309
(215) 746-6700
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- February 18, 2011
- Year of graduation
- 1981 — 45 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- Pennsylvania #MD048469L
- Medicaid
- PA #001478242
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1558472100. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
77
Distinct HCPCS
1
Medicare allowed
$8,935
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 77 | 17 | $116 |
In context: peer comparison
Among 90 peers in this city , average services per provider: 143. This provider delivers 0.5× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
476
Patients
15
Total drug cost
$13,731
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Clonazepam | Generic | 89 | 15 | $1,261 |
| Escitalopram Oxalate | Generic | 49 | 0 | $688 |
| Quetiapine Fumarate | Generic | 45 | 0 | $556 |
| Clozapine | Generic | 40 | 0 | $2,065 |
| Olanzapine | Generic | 37 | 0 | $2,169 |
| Trazodone Hcl | Generic | 32 | 0 | $500 |
| Duloxetine Hcl | Generic | 29 | 0 | $1,213 |
| Aripiprazole | Generic | 28 | 0 | $993 |
| Oxcarbazepine | Generic | 27 | 0 | $1,693 |
| Bupropion Xl (Bupropion Hcl) | Brand | 23 | 0 | $593 |
Frequently asked questions
What is Dr. Chang-Gyu Hahn's medical specialty?
Dr. Chang-Gyu Hahn practices Psychiatry Physician in Philadelphia, PA.
Where does Dr. Chang-Gyu Hahn practice?
Dr. Chang-Gyu Hahn practices at 3535 Market St, Philadelphia, PA 191043309. Office phone: 2157466700.
What is Dr. Chang-Gyu Hahn's NPI?
Dr. Chang-Gyu Hahn's National Provider Identifier (NPI) is 1558472100, issued by NPPES.
Does Dr. Chang-Gyu Hahn accept Medicare assignment?
Yes. Dr. Chang-Gyu Hahn accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Chang-Gyu Hahn commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.