Ross A. Pirkle, M.D.
NPI 1184656688ActiveIndividual· Internal Medicine· Walnut Creek, CA
Internal Medicine (M.D.) with Bass Medical Group, practicing in Walnut Creek, California. Their prescriptions cost Medicare Part D more than their services did: $552,941 for 4,306 claims, against $243,062 paid for services in 2024. Abbvie Inc. was the largest of 22 companies reporting payments in 2025, $1,602 in all, mostly food and beverage. Lists John Muir Medical Center - Concord Campus and 1 other hospital as hospital affiliations.
Overview
| NPI | 1184656688 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 7, 2006 |
| Last updated in NPPES | Feb 27, 2025 |
| Certified by provider | Feb 27, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A60017 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 314 |
|---|---|
| Services billed | 9,420 across 56 procedure codes |
| Paid by Medicare | $243,062 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,306 · 9,736 30-day fills |
|---|---|
| Patients | 288 |
| Total drug cost | $552,941 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1994 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Bass Medical GroupChico, CA · 291 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Other facilities
- One Health Home Care, IncHome health agency · Livermore, CA
Industry payments (Open Payments)
- 2025$1,602 · 61 payments from 22 companies
- 2024$1,781 · 52 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $243.11 | 7 |
| Astrazeneca Pharmaceuticals LP | $168.12 | 3 |
| Pfizer Inc. | $149.23 | 6 |
| Glaxosmithkline, LLC. | $148.45 | 7 |
| Lilly USA, LLC | $144.56 | 6 |
What the 2025 payments were for
- Food and Beverage$1,602 · 61 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Walnut Creek
- 1003139445
- 1033160692
- 1083849111
- 1104062173
- 1144406273
- 1154958247
- 1184645715
- 1184760423
- 1184910390
- 1184916082
- 1215983440
- 1215988878
All 204 internal medicine physicians in Walnut Creek · All internal medicine physicians in California