Physician Profile
Unclaimed ProfileAbout CHANG
Based in Walnut Creek, CA, Ruby Chang, M.D. is listed in the NPI registry under diagnostic radiology. Ruby graduated from Rutgers New Jersey Medical School in 1998.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What kind of doctor is Dr. Chang?
Dr. Chang is a diagnostic radiology in Walnut Creek, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “DIAGNOSTIC RADIOLOGY”.
NPI registry
What is Dr. Chang's address?
Dr. Chang is listed at 2125 OAK GROVE RD SUITE 200, Walnut Creek, CA 94598. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Chang?
The number on file is (925) 296-7150. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Chang?
Dr. Chang's National Provider Identifier is 1164459335. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Chang train?
Dr. Chang attended Rutgers New Jersey Medical School, graduating in 1998. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Chang have?
Dr. Chang has 28 years experience. Calculated from a graduation year of 1998, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Chang perform?
According to Medicare billing data, Dr. Chang performs procedures including biopsy of breast and placement of locating device using ultrasound, first growth and biopsy of breast and placement of locating device using x-ray with needle, first growth; reads or performs imaging such as screening 3d breast mammography and screening mammography. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Chang's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Chang. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (925) 296-7150
- Email not available
Practice Locations
2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598
Procedures Most Often Billed to Medicare
19,738 services · 8,630 patients · 25 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Biopsy of breast and placement of locating device using ultrasound, first growth | Procedure | 19083 |
30 |
| Biopsy of breast and placement of locating device using x-ray with needle, first growth | Procedure | 19081 |
21 |
| Screening 3d breast mammography | Imaging | 77063 |
3,410 |
| Screening mammography | Imaging | 77067 |
3,406 |
| Diagnostic mammography of 1 breast | Imaging | 77065 |
240 |
| Limited ultrasound scan of 1 breast | Imaging | 76642 |
229 |
| Diagnostic mammography of both breasts | Imaging | 77066 |
205 |
| X-ray of chest, 1 view | Imaging | 71045 |
166 |
| Dxa bone density measurement of hip, pelvis, spine | Imaging | 77080 |
89 |
| X-ray of chest, 2 views | Imaging | 71046 |
69 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other diagnostic radiology specialists at this location 8
Same specialty, same street address — most likely the same department or group.
Other diagnostic radiology specialists in Walnut Creek 4
Same specialty, same city.
Trained at Rutgers New Jersey Medical School 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1998 at Rutgers New Jersey Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Biopsy of breast and placement of locating device using ultrasound, first growth 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.