Kristen P. Tamura, M.D.
NPI 1356502553ActiveIndividual· Internal Medicine, Nephrology· San Jose, CA
Internal Medicine, Nephrology (M.D.) in San Jose, California, licensed in HI and CA, with an NPI issued in June 2008. Their prescriptions cost Medicare Part D more than their services did: $439,957 for 2,145 claims, against $112,764 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 7 companies reporting payments in 2025, $688.72 in all, mostly food and beverage. Lists Maui Memorial Medical Center as a hospital affiliation.
Overview
| NPI | 1356502553 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 19, 2008 |
| Last updated in NPPES | May 4, 2021 |
| Certified by provider | May 4, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | MD19906 | HI |
| Internal Medicine | 207R00000X | A114723 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (CA); Practitioner - Nephrology (HI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 251 |
|---|---|
| Services billed | 1,011 across 21 procedure codes |
| Paid by Medicare | $112,764 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,145 · 5,576 30-day fills |
|---|---|
| Patients | 305 |
| Total drug cost | $439,957 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2008 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliation
- Maui Memorial Medical CenterWailuku, HI
Other facilities
- Liberty Dialysis Hawaii - Maui DialysisDialysis facility · Wailuku, HI
Industry payments (Open Payments)
- 2025$688.72 · 24 payments from 7 companies
- 2024$679.88 · 27 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $324.48 | 13 |
| Astrazeneca Pharmaceuticals LP | $116.86 | 1 |
| Ardelyx, Inc. | $79.02 | 4 |
| Travere Therapeutics, Inc. | $68.07 | 2 |
| Calliditas Therapeutics US Inc. | $51.77 | 2 |
What the 2025 payments were for
- Food and Beverage$688.72 · 24 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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