NPPES file of Aug 9, 2026

Timothy A. Leach, M.D. FACOG

Obstetrics & Gynecology Physician · Walnut Creek, CA

Timothy A. Leach, M.D. FACOG is an obstetrics & gynecology physician with a practice address in Walnut Creek, California, and NPI 1356429534, issued on Nov 2, 2006. Check the license (California G81727, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1356429534
Name
Timothy A. Leach
Credential
M.D. FACOG
Primary taxonomy
Obstetrics & Gynecology Physician 207V00000X
License number
G81727 CA
Self-reported in NPPES; status is on the state search
Practice location
110 Tampico Ste 210, Walnut Creek, CA 94598
Phone
(925) 935-6952
Enumerated
Nov 2, 2006
Record last updated
Mar 4, 2025
Fax
(925) 935-1396
Medicare enrollment
Enrolled (PECOS I20070619000615); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →

Also registered at 110 Tampico Ste 210

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Reena Cho, FNPFamily Nurse Practitioner1033480074
  2. Hope Rubin, PAMedical Physician Assistant1851352355
  3. Marybeth Wakefield, FNPNurse Practitioner1922420785

Verify Timothy A. Leach in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G81727    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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2.1 times the Medicare Part D claims of the average obstetrics & gynecology physician in 2024

343 Medicare Part D claims for 111 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.

  1. Timothy Leach343
  2. Specialty average165

Most prescribed

  1. Estradiol68 claims
  2. Alendronate Sodium42 claims
  3. Progesterone38 claims
  4. Clobetasol Propionate21 claims
  5. Yuvafem21 claims
  6. Ibandronate Sodium18 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $439.39

18 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Timothy Leach$439.39
  2. Specialty average$1,030.61

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Bass Medical GroupWalnut Creek, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Timothy A. Leach among 5,088 obstetrics & gynecology physician records in California

Timothy A. Leach, M.D. FACOG is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.

  • NPI issued2006 · 5% of these records are older, 52% newer
  • In a Medicare fileYes · 74% of these records are
  • In the CMS Doctors and Clinicians fileYes · 53% of these records are
  • Graduated1993 · median 2004 among the 2,700 with a school on file
  • Record last updated2025 · 64% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

56 obstetrics & gynecology physician records list a practice address in Walnut Creek

They are 56 of the 6,170 NPPES records with a practice address in Walnut Creek, and 5,088 obstetrics & gynecology physician records in California.

All 5,088 in California → Every provider in Walnut Creek → Obstetrics & Gynecology Physician nationwide →

The 8 obstetrics & gynecology physician records with the nearest ZIP codes

  1. Rosemary DelgadoWalnut Creek, CA 945981235140500
  2. Anh Do, MDWalnut Creek, CA 945981548362122
  3. Tanees Edraki, MDWalnut Creek, CA 945981881644482
  4. Yaron Friedman, M.D.Walnut Creek, CA 945981730104704
  5. Nadine Hanna, M.D.Walnut Creek, CA 945981043244007
  6. Luman Hughes, M.D.Walnut Creek, CA 945981124040274
  7. Sari Kasper, D.O.Walnut Creek, CA 945981194739110
  8. Gerald Katz, M.D.Walnut Creek, CA 945981306868450

Common questions

What is Timothy A. Leach, M.D. FACOG's NPI number?

Timothy A. Leach, M.D. FACOG's National Provider Identifier (NPI) is 1356429534, issued on Nov 2, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Timothy A. Leach, M.D. FACOG located?

The NPPES record lists a practice address at 110 Tampico Ste 210, Walnut Creek, CA, 94598. Phone: (925) 935-6952. Providers update this record themselves, so call before visiting.

How can I verify Timothy A. Leach, M.D. FACOG's license?

NPPES lists California license number G81727, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Timothy A. Leach, M.D. FACOG prescribe under Medicare Part D?

In 2024, Timothy A. Leach, M.D. FACOG had 343 Medicare Part D claims for 111 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.