Doctor profile · Federal record
Dr. James Ma, MD
Gastroenterology Physician (CMS: Gastroenterology) · Riverside, CA
- NPI 1295802007
- Accepts Medicare
- 36 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
10800 Magnolia Ave
Riverside, CA 925053043
(909) 353-2000
Credentials & registration
- NPI registered
- November 2006 — 20 yrs on file
- Profile last updated
- November 29, 2021
- Year of graduation
- 1990 — 36 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #G74850
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1295802007. Last verified May 11, 2026.Open Payments
Industry payments received
All-time total
$44
Transactions
2
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Boston Scientific Corporation | 2 | $43.97 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
883
Patients
603
Total drug cost
$72,430
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Gavilyte-C (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 561 | 537 | $11,640 |
| Omeprazole | Generic | 134 | 45 | $1,284 |
| Pantoprazole Sodium | Generic | 57 | 21 | $808 |
| Lialda (Mesalamine) | Brand | 22 | 0 | $11,548 |
| Balsalazide Disodium | Generic | 20 | 0 | $4,921 |
| Amjevita(Cf) Autoinjector (Adalimumab-Atto) | Brand | 19 | 0 | $33,117 |
| Mercaptopurine | Generic | 18 | 0 | $2,474 |
| Entecavir | Generic | 16 | 0 | $914 |
| Azathioprine | Generic | 13 | 0 | $418 |
| Cholestyramine (Cholestyramine (With Sugar)) | Brand | 12 | 0 | $820 |
Hospital affiliations
Frequently asked questions
What is Dr. James Ma's medical specialty?
Dr. James Ma practices Gastroenterology Physician in Riverside, CA.
Where does Dr. James Ma practice?
Dr. James Ma practices at 10800 Magnolia Ave, Riverside, CA 925053043. Office phone: 9093532000.
What is Dr. James Ma's NPI?
Dr. James Ma's National Provider Identifier (NPI) is 1295802007, issued by NPPES.
Does Dr. James Ma accept Medicare assignment?
Yes. Dr. James Ma accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.