Dr. Timothy A. Leach, FACOG, MD
- Medicare services, 2024
- 573
- Medicare patients, 2024
- 307
- Part D claims, 2024
- 343
- Hospital affiliations
- 4
- Industry payments
- $4,333
- Practice address
- 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
- Practice phone
- Call (925) 939-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Leach's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Timothy A. Leach is an OB-GYN in Walnut Creek, California
Dr. Leach practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health.
Dr. Leach's NPI, 1356429534, was assigned on November 2, 2006. Dr. Leach graduated from UC Irvine School of Medicine in 1993. Dr. Leach holds California license G81727.
- NPI
- 1356429534NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032218813
- NPI enumeration date
- November 2, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (925) 939-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Timothy A. Leach practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California
Dr. Leach's primary practice is John Muir Medical Center, Walnut Creek, at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598 in Contra Costa County. The practice phone is (925) 939-3000.
- John Muir Medical Center, Walnut Creek1601 Ygnacio Valley Rd, Walnut Creek, CA 94598 · Contra Costa CountyPhone(925) 939-3000
Source: Dmand AI Affiliation Data
Dr. Timothy A. Leach is affiliated with 5 sites of care and 2 medical groups
Dr. Leach's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dr. Leach is also affiliated with Concord Medical Center. The medical group on file is BASS Medical Group. Dmand AI also links Dr. Leach to 2 more hospitals, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Timothy A. Leach's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Leach practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John Muir Medical Center, Walnut Creek | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across John Muir Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Timothy A. Leach is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Leach's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Leach is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dr. Leach is licensed in California.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
Clinical focus
Dmand AI lists menopause, ovarian cyst, pelvic prolapse, UTI and vaginal infection among the conditions Dr. Leach treats.
OB-GYNs near Dr. Leach
Counts of OB-GYNs with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Timothy A. Leach billed Medicare for 573 services in 2024
CMS data shows 573 Medicare services from Dr. Leach across 7 procedure codes in 2024, for 307 Medicare patients. Medicare paid $47,763 for them. Every service was in an office.
Dr. Leach's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3382024: 37712%
- Other services
- 2023: 1992024: 1838%
- Lab and pathology
- 2023: 02024: 13
Dr. Leach compared with the California median for OB-GYNs, 2024
- Dr. Leach
- California median
- Medicare services
- 573vs 589.9 times
- Medicare patients
- 307vs 525.9 times
- Part D claims
- 266vs 357.6 times
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Leach's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Leach?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Leach and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Timothy A. Leach treated 307 Medicare patients in 2024, average age 72
CMS counts 307 Medicare patients who saw Dr. Leach in 2024. The largest group is 65 to 74, with 191 patients. 75% of them have high cholesterol, and 49% have high blood pressure. Their average risk score is 0.71, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Leach's median patient age at 52, with 97% women.
Dr. Leach's Medicare patients by age, 2024
Chronic conditions among Dr. Leach's Medicare patients, 2024
- High cholesterol75%
- High blood pressure49%
- Arthritis47%
- Osteoporosis37%
- Anxiety19%
- Mood disorders18%
- Cancer16%
- Depression16%
Share of Medicare patients with each condition. A patient can have several.
Dr. Leach's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women97%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Timothy A. Leach wrote 343 Medicare Part D claims in 2024
In 2024, Dr. Leach wrote 343 Medicare Part D claims for 111 patients. 78% of them were for generic drugs. CMS names the drug for 266 of them, across 10 drugs with 11 or more claims each, at $23,217 in total drug cost. In 2023, CMS named 178 claims across 8 drugs.
Dr. Leach's Part D claims by kind of drug, 2024
- Generic267 claims78%
- Brand-name76 claims22%
Dr. Leach's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Leach's Part D claims, 2024
- Antibiotics4%13 of 343 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1782024: 26649%
Drugs named by CMS: 10 in 2024, 8 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Timothy A. Leach takes part in Medicare
Dr. Leach accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of the uterus: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Timothy A. Leach received $4,333 in industry payments from 2016 to 2025
CMS Open Payments shows 178 general payments to Dr. Leach from 25 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $723.
General payments to Dr. Leach by program year, 2016 to 2025
General payments to Dr. Leach by kind, 2016 to 2025
- Food and beverage$4,26999%
- Education$641%
Companies that paid Dr. Leach the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Timothy A. Leach has 1 award and honors on record
Dmand AI lists 1 award for Dr. Leach.
Awards and honors for Dr. Leach
- Undated
- ACOG Fellow
Source: Dmand AI Professional Profile Data
Dr. Timothy A. Leach graduated from UC Irvine School of Medicine
Dr. Leach graduated from UC Irvine School of Medicine in 1993. Dr. Leach is a member of American College of Obstetricians and Gynecologists.
- Medical school
- Board certified in obstetrics & gynecology
- Board certified in certified menopausal practitioner
Source: Dmand AI Professional Profile Data
Dr. Timothy A. Leach accepts plans from 7 insurance carriers
Dr. Leach is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
- Molina
Plan types Dr. Leach accepts, by number of carriers
- Medicare7
- PPO5
- HMO2
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Timothy A. Leach's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Timothy A. Leach
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Timothy A. Leach's NPI number?
Dr. Timothy A. Leach's NPI number is 1356429534. It was assigned on November 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Timothy A. Leach?
Dr. Timothy A. Leach is an OB-GYN in Walnut Creek, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Timothy A. Leach practice?
Dr. Leach practices at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598. Dr. Leach's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Dr. Leach to 2 hospitals, 1 group practice or clinic and 1 medical group.
What is Dr. Timothy A. Leach's office phone number?
The practice phone on file for Dr. Leach is (925) 939-3000.
What is Dr. Timothy A. Leach's medical license number?
Dr. Leach holds California license G81727.
Which hospitals is Dr. Timothy A. Leach affiliated with?
Dr. Leach practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California. Dr. Leach is also affiliated with Concord Medical Center. Dmand AI links Dr. Leach to 2 more hospitals.
What medical group is Dr. Timothy A. Leach part of?
Dr. Leach is linked to BASS Medical Group. Dmand AI links Dr. Leach to 1 more medical group.
Does Dr. Timothy A. Leach accept Medicare?
Yes. CMS data shows Dr. Leach billed Medicare for 573 services in 2024, and Dr. Leach accepts Medicare assignment.
How many Medicare patients does Dr. Timothy A. Leach see?
CMS counts 307 Medicare patients who saw Dr. Leach in 2024, with an average age of 72.
Is Dr. Timothy A. Leach board certified?
Yes. Dr. Leach is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
Show 6 more questionsShow fewer questions
What services does Dr. Timothy A. Leach bill to Medicare?
In 2024, Dr. Leach's most billed Medicare services were office visit, established patient (99214), medicare service (G0101) and office visit, established patient (99213).
Where did Dr. Timothy A. Leach go to medical school?
Dr. Leach graduated from UC Irvine School of Medicine in 1993.
What drugs does Dr. Timothy A. Leach prescribe most?
In 2024 Medicare Part D data, Dr. Leach's most prescribed drugs by claims were Estradiol, Alendronate Sodium and Progesterone.
Has Dr. Timothy A. Leach received payments from drug or device companies?
CMS Open Payments shows $4,333 in general payments to Dr. Leach from 25 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Timothy A. Leach been practicing?
Dr. Leach graduated from medical school in 1993, 33 years ago.
What insurance does Dr. Timothy A. Leach accept?
Dr. Leach is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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