Doctor profile · Federal record
Dr. Gemmy Hannsun, MD
Diagnostic Radiology Physician (CMS: Diagnostic Radiology) · Orange, CA
- NPI 1992120026
- Accepts Medicare
- MIPS 86.3 / 100 · 2023
- 10 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
101 the City Dr S
Orange, CA 928683201
(714) 456-8888 - Additional location
-
1100 N Tustin Ave Ste A
Santa Ana, CA 927053509
(714) 643-5407 - Mailing address
-
2201 N Grand Ave Unit 10773
Santa Ana, CA 927112239
Credentials & registration
- NPI registered
- February 2014 — 12 yrs on file
- Profile last updated
- January 20, 2026
- Year of graduation
- 2016 — 10 yrs since
- Specialty taxonomy
- 2085R0202X — NUCC code
- State license (1)
- California #A153743
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1992120026. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
8,652
Distinct HCPCS
10
Medicare allowed
$254,437
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
A9575 |
Injection, gadoterate meglumine, 0.1 ml | 6,300 | 38 | $0 | |
77067 |
Screening mammography | 668 | 668 | $147 | |
77063 |
Screening 3d breast mammography | 656 | 656 | $59 | |
77080 |
Dxa bone density measurement of hip, pelvis, spine | 273 | 273 | $43 | |
G0279 |
Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) | 210 | 208 | $59 | |
77066 |
Diagnostic mammography of both breasts | 154 | 154 | $182 | |
76642 |
Limited ultrasound scan of 1 breast | 104 | 101 | $103 | |
76641 |
Complete ultrasound scan of 1 breast | 85 | 85 | $171 | |
77065 |
Diagnostic mammography of 1 breast | 73 | 70 | $144 | |
77049 |
Mri scan of both breasts | 34 | 34 | $412 |
In context: peer comparison
Among 37 peers in Orange Diagnostic Radiology Physician, average services per provider: 116. This provider delivers 75× the peer median.Frequently asked questions
What is Dr. Gemmy Hannsun's medical specialty?
Dr. Gemmy Hannsun practices Diagnostic Radiology Physician in Orange, CA.
Where does Dr. Gemmy Hannsun practice?
Dr. Gemmy Hannsun practices at 101 the City Dr S, Orange, CA 928683201. Office phone: 7144568888.
What is Dr. Gemmy Hannsun's NPI?
Dr. Gemmy Hannsun's National Provider Identifier (NPI) is 1992120026, issued by NPPES.
Does Dr. Gemmy Hannsun accept Medicare assignment?
Yes. Dr. Gemmy Hannsun accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gemmy Hannsun commonly perform?
Top Medicare-reported procedures in 2023: Injection, gadoterate meglumine, 0.1 ml (HCPCS A9575); Screening mammography (HCPCS 77067); Screening 3d breast mammography (HCPCS 77063). Source: CMS Medicare Physician & Other Practitioners file.