Chang-Gyu Hahn, MD
Psychiatry Physician · Philadelphia, PA
Chang-Gyu Hahn, MD is a psychiatry physician with a practice address in Philadelphia, Pennsylvania, and NPI 1558472100, issued on Aug 31, 2006. Check the license (Pennsylvania MD048469L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Chang-Gyu Hahn
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- MD048469L PA
Self-reported in NPPES; status is on the state search - Practice location
- 3535 Market St, Philadelphia, PA 19104
- Phone
- (215) 746-6700
- Enumerated
- Aug 31, 2006
- Record last updated
- Feb 18, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 001478242 PA
- Medicare enrollment
- Enrolled (PECOS I20040510000401); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,662 in Pennsylvania → Look up another NPI →
Also registered at 3535 Market St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Brooke Bailer, PHDPsychologist1457607855
- Claudia Baldassano, MDPsychiatry Physician1598772048
Verify Chang-Gyu Hahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD048469LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average psychiatry physician in 2024
638 Medicare Part D claims for 34 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Clonazepam86 claims
- Aripiprazole50 claims
- Quetiapine Fumarate48 claims
- Escitalopram Oxalate46 claims
- Trazodone Hcl42 claims
- Clozapine39 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Jefferson University PhysiciansPhiladelphia, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Chang-Gyu Hahn among 2,662 psychiatry physician records in Pennsylvania
Chang-Gyu Hahn, MD is one of 2,662 psychiatry physician records with a practice address in Pennsylvania. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 61% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated1981 · median 2003 among the 1,186 with a school on file
- Record last updated2011 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
727 psychiatry physician records list a practice address in Philadelphia
They are 727 of the 42,849 NPPES records with a practice address in Philadelphia, and 2,662 psychiatry physician records in Pennsylvania.
All 2,662 in Pennsylvania → Every provider in Philadelphia → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Steven Arnold, MDPhiladelphia, PA 191041437186327
- James Cornish, MDPhiladelphia, PA 191041417984337
- Charles Dackis, MDPhiladelphia, PA 191041922034628
- Sarah Demichele, MDPhiladelphia, PA 191041669408449
- Benoit Dube, MDPhiladelphia, PA 191041659307338
- Steven Huege, MDPhiladelphia, PA 191041598716367
- Deborah Kim, MDPhiladelphia, PA 191041477580389
- Avram MackPhiladelphia, PA 191041811972573
Common questions
What is Chang-Gyu Hahn, MD's NPI number?
Chang-Gyu Hahn, MD's National Provider Identifier (NPI) is 1558472100, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Chang-Gyu Hahn, MD located?
The NPPES record lists a practice address at 3535 Market St, Philadelphia, PA, 19104. Phone: (215) 746-6700. Providers update this record themselves, so call before visiting.
How can I verify Chang-Gyu Hahn, MD's license?
NPPES lists Pennsylvania license number MD048469L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Chang-Gyu Hahn, MD prescribe under Medicare Part D?
In 2024, Chang-Gyu Hahn, MD had 638 Medicare Part D claims for 34 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.