Warren David Johnston, MD - Medicare Cardiovascular Disease (cardiology) in Orange, CA

Warren David Johnston, MD is a medicare enrolled "Internal Medicine - Cardiovascular Disease" physician in Orange, California. He went to University Of Rochester School Of Medicine And Dentistry and graduated in 1975 and has 49 years of diverse experience with area of expertise as Cardiovascular Disease (cardiology). He is a member of the group practice Providence Medical Foundation and his current practice location is 1140 W La Veta Ave Ste 430, Orange, California. You can reach out to his office (for appointments etc.) via phone at (714) 543-5555.

Warren David Johnston is licensed to practice in California (license number G33255) 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 1427052802.

Contact Information

Warren David Johnston, MD
1140 W La Veta Ave Ste 430,
Orange, CA 92868-4226
(714) 543-5555
(714) 836-2427

Map and Direction




Physician's Profile

Full NameWarren David Johnston
GenderMale
SpecialityCardiovascular Disease (cardiology)
Experience49 Years
Location1140 W La Veta Ave Ste 430, Orange, 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:
  • Warren David Johnston attended and graduated from University Of Rochester School Of Medicine And Dentistry in 1975
  NPI Data:
  • NPI Number: 1427052802
  • Provider Enumeration Date: 06/13/2005
  • Last Update Date: 11/03/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 6103900063
  • Enrollment ID: I20080301000100

Medical Identifiers

Medical identifiers for Warren David Johnston such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1427052802NPI-NPPES
DB3373OtherCARAILROAD MEDICARE
W13988AOtherCAMEDICARE PTAN
060041547OtherCARAILROAD MEDICARE
W13988OtherCAMEDICARE PTAN
00G332550MedicaidCA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RC0000XInternal Medicine - Cardiovascular Disease G33255 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
St Joseph HospitalOrange, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Providence Medical Foundation89219932051293

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. Warren David Johnston allows following entities to bill medicare on his behalf.
Entity NameProvidence Medical Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1285890624
PECOS PAC ID: 8921993205
Enrollment ID: O20040216001346

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. Warren David Johnston 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
Warren David Johnston, MD
1140 W La Veta Ave Ste 430,
Orange, CA 92868-4226

Ph: (714) 543-5555
Warren David Johnston, MD
1140 W La Veta Ave Ste 430,
Orange, CA 92868-4226

Ph: (714) 543-5555

Reviews and Comments


Internal Medicine Doctors in Orange, CA

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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.

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