Timothy A. Leach, M.D. FACOG
NPI 1356429534ActiveIndividual· Obstetrics & Gynecology· Walnut Creek, CA
Obstetrics & Gynecology (M.D. FACOG) with Bass Medical Group, practicing in Walnut Creek, California. In 2024 Medicare paid $54,410 for 307 patients, and Part D covered 343 of their prescriptions, 78% of them generic. Mayne Pharma Commercial LLC was the largest of 6 companies reporting payments in 2025, $701.82 in all, mostly food and beverage. Lists John Muir Medical Center - Concord Campus and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1356429534 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. FACOG |
| Sole proprietor | No |
| NPI issued | Nov 2, 2006 |
| Last updated in NPPES | Mar 4, 2025 |
| Certified by provider | Mar 4, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | G81727 | 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 - Obstetrics/Gynecology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 307 |
|---|---|
| Services billed | 621 across 23 procedure codes |
| Paid by Medicare | $54,410 |
Part D prescriptions in 2024
| Prescriptions (claims) | 343 · 751 30-day fills |
|---|---|
| Patients | 111 |
| Total drug cost | $38,252 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 1993 |
|---|---|
| Medicare specialty | Obstetrics/Gynecology |
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
- San Ramon Regional Medical CenterSan Ramon, CA
Industry payments (Open Payments)
- 2025$701.82 · 44 payments from 6 companies
- 2024$439.39 · 18 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Mayne Pharma Commercial LLC | $330.33 | 31 |
| Astellas Pharma US Inc | $147.57 | 6 |
| Exeltis, USA Inc. | $105.89 | 1 |
| Evofem Biosciences, Inc. | $69.65 | 4 |
| Biogen, Inc. | $25.85 | 1 |
What the 2025 payments were for
- Food and Beverage$701.82 · 44 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other OB-GYNs in Walnut Creek
- 1023541471
- 1043244007
- 1053805200
- 1063627362
- 1124040274
- 1154321503
- 1194739110
- 1255673463
- 1306868450
- 1588742050
- 1649681982
- 1659385151