Dr Crystal Lee Irwin Warren, DO - Medicare Emergency Medicine in Fresno, CA

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Dr Crystal Lee Irwin Warren, DO is a medicare enrolled "Emergency Medicine" physician in Fresno, California. Her current practice location is 1303 E Herndon Ave, Fresno, California. You can reach out to her office (for appointments etc.) via phone at (559) 450-3000.

Dr Crystal Lee Irwin Warren is licensed to practice in California (license number 20A15353) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1235585639.

Contact Information

Dr Crystal Lee Irwin Warren, DO
1303 E Herndon Ave,
Fresno, CA 93720
(559) 450-3000
Not Available

Map and Direction




Physician's Profile

Full NameDr Crystal Lee Irwin Warren
GenderFemale
SpecialityEmergency Medicine
Location1303 E Herndon Ave, Fresno, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1235585639
  • Provider Enumeration Date: 05/04/2016
  • Last Update Date: 09/09/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 6002166352
  • Enrollment ID: I20181127000655

Medical Identifiers

Medical identifiers for Dr Crystal Lee Irwin Warren such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1235585639NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 20A15353 (California)Primary

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. Dr Crystal Lee Irwin Warren allows following entities to bill medicare on her behalf.
Entity NameCep America - California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023063542
PECOS PAC ID: 6103739131
Enrollment ID: O20031106000520
Entity NameSaint Agnes Medical Center
Entity TypePart B Supplier - Hospital Department(s)
Entity IdentifiersNPI Number: 1205845567
PECOS PAC ID: 3971409335
Enrollment ID: O20070824000478

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. Dr Crystal Lee Irwin Warren 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
Dr Crystal Lee Irwin Warren, DO
2100 Powell St Ste 400,
Emeryville, CA 94608-1826

Ph: (510) 350-2600		Dr Crystal Lee Irwin Warren, DO
1303 E Herndon Ave,
Fresno, CA 93720

Ph: (559) 450-3000

Reviews and Comments


Emergency Medicine Doctors in Fresno, CA

Michelle Lea Storkan, M.D.
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Practice Location: 2823 Fresno St, Fresno, CA 93721
Phone: 559-499-6440    
Harminder S Longia, MD
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Phone: 559-225-6100    
Dr. Jessie Werner, M.D.
Emergency Medicine
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Practice Location: 2823 Fresno St, Fresno, CA 93721
Phone: 559-499-6440    
Joanna Burnett Watterson, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2823 Fresno St, Fresno, CA 93721
Phone: 559-459-6000    
Megann Forrest Young, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 2823 Fresno St, Fresno, CA 93721
Phone: 559-499-6440    Fax: 559-499-6441
Riley Dickson,
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1303 E Herndon Ave, Fresno, CA 93720
Phone: 707-312-1967    
Conrad Njamfa, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1303 E Herndon Ave, Fresno, CA 93720
Phone: 559-450-3000    

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).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.