Doctor profile · Federal record
Dr. Gwendolen Chang, M.D.
Internal Medicine Physician (CMS: Nephrology) · San Leandro, CA
- NPI 1386807402
- Accepts Medicare
- 19 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
13851 E 14Th St Ste 206
San Leandro, CA 945782627
(510) 351-9373
fax (510) 351-0616
Credentials & registration
- NPI registered
- July 2008 — 18 yrs on file
- Profile last updated
- December 4, 2013
- Year of graduation
- 2007 — 19 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A106132
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1386807402. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,785
Distinct HCPCS
10
Medicare allowed
$326,224
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 436 | 130 | $128 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 376 | 168 | $134 | |
90960 |
Dialysis services, 4 or more physician visits per month (20 years or older) | 301 | 38 | $406 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 242 | 99 | $87 | |
90935 |
Hemodialysis procedure with physician evaluation | 117 | 71 | $79 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 74 | 71 | $194 | |
90961 |
Dialysis services, 2-3 physician visits per month (20 years or older) | 52 | 20 | $339 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 46 | 46 | $197 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 46 | 42 | $147 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 41 | 28 | $189 |
In context: peer comparison
Among 15 peers in San Leandro Internal Medicine Physician, average services per provider: 94. This provider delivers 19× the peer median.Open Payments
Industry payments received
All-time total
$1,284
Transactions
52
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Novartis Pharmaceuticals Corporation | 10 | $248.59 | |
| Amgen INC. | 8 | $217.16 | |
| Fresenius USA Marketing, INC. | 8 | $162.48 | |
| Otsuka America Pharmaceutical, INC. | 6 | $151.72 | |
| Ardelyx, INC. | 3 | $86.11 | |
| Vifor Pharma, INC. | 3 | $82.87 | |
| Bayer Healthcare Pharmaceuticals INC. | 2 | $64.10 | |
| Opko Pharmaceuticals, LLC | 3 | $52.10 | |
| Aurinia Pharma U.S., INC. | 2 | $48.79 | |
| Novo Nordisk INC | 2 | $34.50 | |
| Travere Therapeutics, INC. | 1 | $27.13 | |
| Mallinckrodt Hospital Products INC. | 1 | $26.04 | |
| Calliditas Therapeutics US INC. | 1 | $25.52 | |
| Lilly USA, LLC | 1 | $24.43 | |
| AstraZeneca Pharmaceuticals Lp | 1 | $18.88 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,036
Patients
229
Total drug cost
$230,049
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Amlodipine Besylate | Generic | 172 | 56 | $3,091 |
| Allopurinol | Generic | 128 | 37 | $2,291 |
| Furosemide | Generic | 125 | 31 | $1,160 |
| Bumetanide | Generic | 99 | 24 | $4,845 |
| Losartan Potassium | Generic | 83 | 27 | $1,500 |
| Lisinopril | Generic | 78 | 25 | $1,310 |
| Veltassa (Patiromer Calcium Sorbitex) | Brand | 54 | 0 | $66,545 |
| Lokelma (Sodium Zirconium Cyclosilicate) | Brand | 50 | 0 | $49,726 |
| Farxiga (Dapagliflozin Propanediol) | Brand | 45 | 13 | $37,455 |
| Rayaldee (Calcifediol) | Brand | 42 | 0 | $58,118 |
Hospital affiliations
Frequently asked questions
What is Dr. Gwendolen Chang's medical specialty?
Dr. Gwendolen Chang practices Internal Medicine Physician in San Leandro, CA.
Where does Dr. Gwendolen Chang practice?
Dr. Gwendolen Chang practices at 13851 E 14Th St Ste 206, San Leandro, CA 945782627. Office phone: 5103519373.
What is Dr. Gwendolen Chang's NPI?
Dr. Gwendolen Chang's National Provider Identifier (NPI) is 1386807402, issued by NPPES.
Does Dr. Gwendolen Chang accept Medicare assignment?
Yes. Dr. Gwendolen Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gwendolen Chang commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); 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.