John Alan Leonard, MD - Medicare Emergency Medicine in Walnut Creek, CA

John Alan Leonard, MD is a medicare enrolled "Emergency Medicine" physician in Walnut Creek, California. He went to University Of California, Davis School Of Medicine and graduated in 1992 and has 32 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Cep America - California and his current practice location is 1601 Ygnacio Valley Rd, Walnut Creek, California. You can reach out to his office (for appointments etc.) via phone at (925) 939-3000.

John Alan Leonard is licensed to practice in California (license number G77839) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1578582961.

Contact Information

John Alan Leonard, MD
1601 Ygnacio Valley Rd,
Walnut Creek, CA 94598-3122
(925) 939-3000
Not Available

Map and Direction




Physician's Profile

Full NameJohn Alan Leonard
GenderMale
SpecialityEmergency Medicine
Experience32 Years
Location1601 Ygnacio Valley Rd, Walnut Creek, California
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • John Alan Leonard attended and graduated from University Of California, Davis School Of Medicine in 1992
  NPI Data:
  • NPI Number: 1578582961
  • Provider Enumeration Date: 07/18/2006
  • Last Update Date: 11/08/2007
  Medicare PECOS Information:
  • PECOS PAC ID: 8325127608
  • Enrollment ID: I20080512000585

Medical Identifiers

Medical identifiers for John Alan Leonard such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1578582961NPI-NPPES
00G778390MedicaidCA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine G77839 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
John Muir Medical Center - Concord CampusConcord, CAHospital
St Rose HospitalHayward, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Cep America - California6103739131974

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. John Alan Leonard allows following entities to bill medicare on his behalf.
Entity NameCep America - California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023063542
PECOS PAC ID: 6103739131
Enrollment ID: O20031106000520
Entity NameCep America - California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1548667843
PECOS PAC ID: 6103739131
Enrollment ID: O20040121000458

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. John Alan Leonard is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
John Alan Leonard, MD
2100 Powell St, Ste 920,
Emeryville, CA 94608-1826

Ph: (510) 350-2600
John Alan Leonard, MD
1601 Ygnacio Valley Rd,
Walnut Creek, CA 94598-3122

Ph: (925) 939-3000

Reviews and Comments


Emergency Medicine Doctors in Walnut Creek, CA

Brook Andrew Woolley, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1425 S Main St, Emergency Medicine Department, Walnut Creek, CA 94596
Phone: 925-295-5100    
Malcolm C Johnson, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: 925-939-3000    
Alice Decker Hunter, M.D.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: 925-939-3000    
Seigfred P. Jalalon, M.D.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1450 Treat Blvd # 160, Walnut Creek, CA 94597
Phone: 925-296-9000    
Theodore Ira Kloth, M.D.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: 925-939-3000    
Stephanie Carlson, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4000    
Michael R. Lozano, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4000    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

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