Nagarathna G. Manjappa, MD
NPI 1710093349ActiveIndividual· Internal Medicine, Nephrology· Napa, CA
Internal Medicine, Nephrology (MD) with Nagarathna G Manjappa M D Inc, practicing in Napa, California. Their prescriptions cost Medicare Part D more than their services did: $804,789 for 2,168 claims, against $321,835 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 10 companies reporting payments in 2025, $2,760 in all, mostly consulting fees. Lists Adventist Health Clearlake and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1710093349 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 23, 2006 |
| Last updated in NPPES | Jan 15, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A118723 | CA |
| Internal Medicine | 207R00000X | A118723 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 774 |
|---|---|
| Services billed | 2,398 across 26 procedure codes |
| Paid by Medicare | $321,835 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,168 · 4,531 30-day fills |
|---|---|
| Patients | 348 |
| Total drug cost | $804,789 |
| Generic share | 69% of claims |
Education and affiliations
| Graduation year | 2000 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Nagarathna G Manjappa M D IncNapa, CA · 4 clinicians
Hospital affiliations
- Adventist Health ClearlakeClearlake, CA
- Adventist Health St HelenaSaint Helena, CA
- Providence Queen of the Valley Medical CenterNapa, CA
- Sonoma Valley HospitalSonoma, CA
- Sutter Lakeside HospitalLakeport, CA
Other facilities
- Davita Lakeport Dialysis CenterDialysis facility · Lakeport, CA
- Davita Vallejo DialysisDialysis facility · Vallejo, CA
- Usrc Napa DialysisDialysis facility · Napa, CA
Industry payments (Open Payments)
- 2025$2,760 · 38 payments from 10 companies
- 2024$682.54 · 27 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $1,740 | 6 |
| Amgen Inc. | $374.64 | 9 |
| Novartis Pharmaceuticals Corporation | $264.92 | 8 |
| Astrazeneca Uk Limited | $129.89 | 1 |
| Mallinckrodt Hospital Products Inc. | $65.57 | 3 |
What the 2025 payments were for
- Consulting Fee$1,600 · 1 payment
- Food and Beverage$1,140 · 36 payments
- Education$19.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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