Crystal Chang, M.D.
NPI 1518253012 · Diagnostic Radiology Physician · Novato, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Crystal Chang, M.D. is a Diagnostic Radiology Physician provider in Novato, CA (NPI 1518253012).
Provider details
- NPI number
- 1518253012
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A140488 (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
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
3,286 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 | 748 | $43 |
| Screening 3d Breast Mammography77063 | 744 | $34 |
| Screening Mammography77067 | 376 | $88 |
| Screening 3d Breast Mammography77063 | 359 | $34 |
| X-Ray of Chest, 1 View71045 | 159 | $10 |
| Diagnostic Mammography of 1 Breast77065 | 116 | $46 |
Practice location
Mailing address
Additional practice locations (1)
- 2637 Shadelands DrWalnut Creek, CA 94598-2512Phone: (925) 329-3710
Registry dates
- Enumerated
- 2011-06-22
- Last updated
- 2024-12-02
- Certified
- 2024-12-02
Frequently asked questions
- What is Crystal Chang's NPI number?
- Crystal Chang's National Provider Identifier (NPI) is 1518253012, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Crystal Chang's specialty?
- Crystal Chang is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Crystal Chang located?
- Crystal Chang's practice location on file with NPPES is 180 Rowland Way, Novato, CA 94945-5009.
- What is Crystal Chang's phone number?
- The practice phone number listed in the NPPES registry for Crystal Chang is (415) 290-1500.
- Does Crystal Chang accept Medicare?
- Crystal Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Crystal Chang's NPI active?
- Yes — Crystal Chang's NPI (1518253012) is active in the NPPES registry as of the last update on 2024-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.