Doctor profile · Federal record
Dr. Gene-Yuan Chang, MD
Nephrology Physician (CMS: Nephrology) · Castro Valley, CA
- NPI 1467731828
- Accepts Medicare
- 17 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
19850 Lake Chabot RD
Castro Valley, CA 945464002
(510) 881-1490
Credentials & registration
- NPI registered
- August 2011 — 15 yrs on file
- Profile last updated
- April 25, 2025
- Year of graduation
- 2009 — 17 yrs since
- Specialty taxonomy
- 207RN0300X — NUCC code
- State license (1)
- California #121677
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1467731828. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,670
Distinct HCPCS
10
Medicare allowed
$281,847
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 542 | 249 | $89 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 278 | 127 | $134 | |
90960 |
Dialysis services, 4 or more physician visits per month (20 years or older) | 269 | 45 | $405 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 189 | 172 | $147 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 153 | 69 | $133 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 82 | 46 | $155 | |
90961 |
Dialysis services, 2-3 physician visits per month (20 years or older) | 47 | 28 | $339 | |
90935 |
Hemodialysis procedure with physician evaluation | 37 | 33 | $81 | |
99442 |
Telephone medical discussion with physician, 11-20 minutes | 31 | 24 | $84 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 21 | 21 | $198 |
In context: peer comparison
Among 2 peers in Castro Valley Nephrology Physician, average services per provider: 161. This provider delivers 10× the peer median.Open Payments
Industry payments received
All-time total
$711
Transactions
30
Manufacturers
10
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Amgen INC. | 14 | $355.12 | |
| Fresenius USA Marketing, INC. | 4 | $95.16 | |
| Otsuka America Pharmaceutical, INC. | 3 | $62.90 | |
| Ardelyx, INC. | 2 | $46.02 | |
| Bayer Healthcare Pharmaceuticals INC. | 2 | $43.78 | |
| Vifor Pharma, INC. | 1 | $23.97 | |
| Lilly USA, LLC | 1 | $22.72 | |
| Ani Pharmaceuticals, INC. | 1 | $21.09 | |
| Novo Nordisk INC | 1 | $20.73 | |
| AstraZeneca Pharmaceuticals Lp | 1 | $19.44 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
880
Patients
227
Total drug cost
$130,493
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Carvedilol | Generic | 110 | 31 | $1,480 |
| Bumetanide | Generic | 85 | 30 | $5,062 |
| Amlodipine Besylate | Generic | 83 | 35 | $1,000 |
| Lisinopril | Generic | 68 | 22 | $445 |
| Rayaldee (Calcifediol) | Brand | 66 | 0 | $82,509 |
| Furosemide | Generic | 61 | 22 | $468 |
| Hydralazine Hcl | Generic | 59 | 20 | $1,073 |
| Spironolactone | Generic | 51 | 0 | $408 |
| Tamsulosin Hcl | Generic | 50 | 16 | $1,104 |
| Chlorthalidone | Generic | 45 | 14 | $834 |
Hospital affiliations
Frequently asked questions
What is Dr. Gene-Yuan Chang's medical specialty?
Dr. Gene-Yuan Chang practices Nephrology Physician in Castro Valley, CA.
Where does Dr. Gene-Yuan Chang practice?
Dr. Gene-Yuan Chang practices at 19850 Lake Chabot RD, Castro Valley, CA 945464002. Office phone: 5108811490.
What is Dr. Gene-Yuan Chang's NPI?
Dr. Gene-Yuan Chang's National Provider Identifier (NPI) is 1467731828, issued by NPPES.
Does Dr. Gene-Yuan Chang accept Medicare assignment?
Yes. Dr. Gene-Yuan Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gene-Yuan Chang commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Established patient office or other outpatient visit (HCPCS 99214); Dialysis services, 4 or more physician visits per month (20 years or older) (HCPCS 90960). Source: CMS Medicare Physician & Other Practitioners file.