Geraldine Chang, M.D.
NPI 1831486539 · Diagnostic Radiology Physician · Northridge, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Geraldine Chang, M.D. is a Diagnostic Radiology Physician provider in Northridge, CA (NPI 1831486539).
Provider details
- NPI number
- 1831486539
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A122612 (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
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
12,138 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 | 5,365 | $139 |
| Screening 3d Breast Mammography77063 | 4,760 | $55 |
| Limited Ultrasound Scan of 1 Breast76642 | 520 | $97 |
| Diagnostic Digital Breast Tomosynthesis, Unilateral Or Bilateral (list Separately in Addition to 77065 Or 77066)G0279 | 501 | $50 |
| Diagnostic Mammography of Both Breasts77066 | 318 | $172 |
| Complete Ultrasound Scan of 1 Breast76641 | 290 | $150 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-06-30
- Last updated
- 2017-12-05
Frequently asked questions
- What is Geraldine Chang's NPI number?
- Geraldine Chang's National Provider Identifier (NPI) is 1831486539, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Geraldine Chang's specialty?
- Geraldine Chang is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Geraldine Chang located?
- Geraldine Chang's practice location on file with NPPES is 18436 Roscoe Blvd, Northridge, CA 91325-4107.
- What is Geraldine Chang's phone number?
- The practice phone number listed in the NPPES registry for Geraldine Chang is (818) 435-1400.
- Does Geraldine Chang accept Medicare?
- Geraldine Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Geraldine Chang's NPI active?
- Yes — Geraldine Chang's NPI (1831486539) is active in the NPPES registry as of the last update on 2017-12-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.