Brian Joseph McGuinness, M.D.
NPI 1891870770ActiveIndividual· Colon & Rectal Surgery· Walnut Creek, CA
Colon & Rectal Surgery (M.D.) in Walnut Creek, California, trained at Tulane University School of Medicine (class of 1995). 232 Medicare patients in 2024, $74,657 paid; nearly all of their 119 Part D prescriptions were generic (92%). Vertex Pharmaceuticals Incorporated was the largest of 9 companies reporting payments in 2025, $388.93 in all, mostly food and beverage.
Overview
| NPI | 1891870770 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 26, 2006 |
| Last updated in NPPES | Feb 26, 2025 |
| Certified by provider | Feb 26, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Colon & Rectal Surgery Primary | 208C00000X | A83195 | 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 - Colorectal Surgery (Proctology) (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 232 |
|---|---|
| Services billed | 558 across 76 procedure codes |
| Paid by Medicare | $74,657 |
Part D prescriptions in 2024
| Prescriptions (claims) | 119 · 123 30-day fills |
|---|---|
| Patients | 63 |
| Total drug cost | $5,020 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | Tulane University School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Colorectal Surgery (Proctology) |
| Secondary specialties | Critical Care (Intensivists) |
Medical groups
- Bass Medical GroupChico, CA · 291 clinicians
- John Muir Trauma Physicians Billing ServiceWalnut Creek, CA · 113 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$388.93 · 11 payments from 9 companies
- 2024$331.75 · 9 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vertex Pharmaceuticals Incorporated | $101.94 | 3 |
| Inspire Medical Systems, Inc. | $79.58 | 1 |
| Biotissue Holdings Inc. | $48.21 | 1 |
| Takeda Pharmaceuticals U.S.A., Inc. | $30.36 | 1 |
| Integra Lifesciences Corporation | $29.31 | 1 |
What the 2025 payments were for
- Food and Beverage$388.93 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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