Doctor profile · Federal record
Dr. Ruby Chang, M.D.
Diagnostic Radiology Physician (CMS: Diagnostic Radiology) · Walnut Creek, CA
- NPI 1164459335
- Accepts Medicare
- 28 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
2125 Oak Grove RD, Suite 200
Walnut Creek, CA 945982536
(925) 296-7150
fax (925) 296-7171
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- April 2, 2015
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 2085R0202X — NUCC code
- State license (1)
- California #A81716
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1164459335. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
33,162
Distinct HCPCS
10
Medicare allowed
$973,736
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
A9575 |
Injection, gadoterate meglumine, 0.1 ml | 17,810 | 108 | $0 | |
Q9967 |
Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml | 5,970 | 73 | $0 | |
77063 |
Screening 3d breast mammography | 3,661 | 3,661 | $57 | |
77067 |
Screening mammography | 3,649 | 3,649 | $140 | |
G0279 |
Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) | 355 | 353 | $57 | |
77065 |
Diagnostic mammography of 1 breast | 244 | 244 | $137 | |
76642 |
Limited ultrasound scan of 1 breast | 231 | 229 | $98 | |
77066 |
Diagnostic mammography of both breasts | 204 | 204 | $171 | |
77049 |
Mri scan of both breasts | 107 | 105 | $385 | |
71046 |
X-ray of chest, 2 views | 97 | 97 | $37 |
In context: peer comparison
Among 33 peers in this city , average services per provider: 176. This provider delivers 188× the peer median.Open Payments
Industry payments received
All-time total
$23
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Incyte Corporation | 1 | $22.55 |
By nature of payment
Hospital affiliations
Frequently asked questions
What is Dr. Ruby Chang's medical specialty?
Dr. Ruby Chang practices Diagnostic Radiology Physician in Walnut Creek, CA.
Where does Dr. Ruby Chang practice?
Dr. Ruby Chang practices at 2125 Oak Grove RD, Walnut Creek, CA 945982536. Office phone: 9252967150.
What is Dr. Ruby Chang's NPI?
Dr. Ruby Chang's National Provider Identifier (NPI) is 1164459335, issued by NPPES.
Does Dr. Ruby Chang accept Medicare assignment?
Yes. Dr. Ruby Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Ruby Chang commonly perform?
Top Medicare-reported procedures in 2023: Injection, gadoterate meglumine, 0.1 ml (HCPCS A9575); Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (HCPCS Q9967); Screening 3d breast mammography (HCPCS 77063). Source: CMS Medicare Physician & Other Practitioners file.