Gemmy Hannsun, MD
NPI 1992120026 · Diagnostic Radiology Physician · Orange, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gemmy Hannsun, MD is a Diagnostic Radiology Physician provider in Orange, CA (NPI 1992120026).
Provider details
- NPI number
- 1992120026
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A153743 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
2,704 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Screening Mammography77067 | 666 | $145 |
| Screening 3d Breast Mammography77063 | 665 | $57 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 427 | $44 |
| Diagnostic Digital Breast Tomosynthesis, Unilateral Or Bilateral (list Separately in Addition to 77065 Or 77066)G0279 | 216 | $52 |
| Diagnostic Mammography of Both Breasts77066 | 158 | $178 |
| Limited Ultrasound Scan of 1 Breast76642 | 102 |
Practice location
Mailing address
Additional practice locations (1)
- 1100 N Tustin Ave Ste aSanta Ana, CA 92705-3509Phone: (714) 643-5407
Registry dates
- Enumerated
- 2014-02-26
- Last updated
- 2026-01-20
- Certified
- 2026-01-20
Frequently asked questions
- What is Gemmy Hannsun's NPI number?
- Gemmy Hannsun's National Provider Identifier (NPI) is 1992120026, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gemmy Hannsun's specialty?
- Gemmy Hannsun is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gemmy Hannsun located?
- Gemmy Hannsun's practice location on file with NPPES is 101 the City Dr S, Orange, CA 92868-3201.
- What is Gemmy Hannsun's phone number?
- The practice phone number listed in the NPPES registry for Gemmy Hannsun is (714) 456-8888.
- Does Gemmy Hannsun accept Medicare?
- Gemmy Hannsun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gemmy Hannsun's NPI active?
- Yes — Gemmy Hannsun's NPI (1992120026) is active in the NPPES registry as of the last update on 2026-01-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.