Timothy A Leach, M.D. FACOG

Primary specialty

Obstetrics & Gynecology PhysicianTaxonomy code 207V00000X

License

G81727 Issued in CA

Practice address

110 Tampico Ste 210
Walnut Creek, CA 94598-2962

Phone

(925) 935-6952

Fax

(925) 935-1396

NPI assigned

Nov 2, 2006

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Obstetrics/Gynecology

Education

Other, 1993

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Bass Medical GroupGroup PAC ID 9032111281, 292 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• John Muir Medical Center - Walnut Creek Campus Hospital, Walnut Creek, CA, CCN 050180
• John Muir Medical Center - Concord Campus Hospital, Concord, CA, CCN 050496
• San Ramon Regional Medical Center Hospital, San Ramon, CA, CCN 050689

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: tleach12314@ehr.johnmuirhealth.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Bass Medical Group

  • Obstetrics & Gynecology Physician
  • Walnut Creek, CA
  • NPI 1174253405
  Medicare reassignment Care Compare group NPD
• John Muir Physician Network

  • General Practice Physician
  • Walnut Creek, CA
  • NPI 1841407665
  Medicare reassignment NPD
• Bass Medical Group

  • Orthopaedic Surgery Physician
  • Castro Valley, CA
  • NPI 1093181646
  NPD
• Bass Medical Group

  • Orthopaedic Surgery Physician
  • San Ramon, CA
  • NPI 1467329904
  NPD
• Bass Medical Group

  • Specialist
  • Walnut Creek, CA
  • NPI 1154401941
  NPD (past)
• John Muir Health

  • Rehabilitation Hospital Unit
  • Walnut Creek, CA
  • NPI 1447269303
  NPD (past)
• San Ramon Regional Medical Center, LLC

  • General Acute Care Hospital
  • San Ramon, CA
  • NPI 1932131489
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• John Muir Health

  • General Acute Care Hospital
  • Walnut Creek, CA
  • NPI 1740215219
  Care Compare affiliation
• John Muir Health

  • General Acute Care Hospital
  • Concord, CA
  • NPI 1801821376
  Care Compare affiliation
• San Ramon Regional Medical Center, LLC

  • General Acute Care Hospital
  • San Ramon, CA
  • NPI 1932131489
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1162425600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1741046400000",
    "number": "1356429534",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "110 TAMPICO STE 210",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945982962",
            "telephone_number": "925-935-6952",
            "fax_number": "925-935-1396"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "110 TAMPICO STE 210",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945982962",
            "telephone_number": "925-935-6952",
            "fax_number": "925-935-1396"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "LEACH",
        "first_name": "TIMOTHY",
        "middle_name": "A",
        "credential": "M.D. FACOG",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-11-02",
        "last_updated": "2025-03-04",
        "certification_date": "2025-03-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207V00000X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology",
            "state": "CA",
            "license": "G81727",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Catherine Le
• Dang Le
• Elaine H. Le, MD
• Judy Le, MD
• Susan Le, DPT
• Jaime Leano
• Learts, a Marriage & Family Therapy, a Professional Corporation
• Andrew M. Leavitt, MD
• Mary Lee-Lau, PSY.D.
• Marcos Lee-Ramos

• Obstetrics & Gynecology Physician in Walnut Creek, CA
• Providers in Walnut Creek, CA by specialty
• Obstetrics & Gynecology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 4, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.