Dr Michael Warren Nielsen, MD - Medicare Emergency Medicine in San Diego, CA

Dr Michael Warren Nielsen, MD is a medicare enrolled "Emergency Medicine" physician in San Diego, California. His current practice location is 200 W Arbor Dr, San Diego, California. You can reach out to his office (for appointments etc.) via phone at (619) 543-6236.

Dr Michael Warren Nielsen is licensed to practice in California (license number A79412) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1255301370.

Contact Information

Dr Michael Warren Nielsen, MD
200 W Arbor Dr,
San Diego, CA 92103-9001
(619) 543-6236
Not Available

Map and Direction




Physician's Profile

Full NameDr Michael Warren Nielsen
GenderMale
SpecialityEmergency Medicine
Location200 W Arbor Dr, San Diego, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1255301370
  • Provider Enumeration Date: 01/23/2006
  • Last Update Date: 02/04/2010
  Medicare PECOS Information:
  • PECOS PAC ID: 8224117098
  • Enrollment ID: I20080505000614

Medical Identifiers

Medical identifiers for Dr Michael Warren Nielsen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1255301370NPI-NPPES
1255301370MedicaidCA
00A7941206141MedicaidCA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine A79412 (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 Michael Warren Nielsen allows following entities to bill medicare on his behalf.
Entity NameEmergency Services Medical Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1699725069
PECOS PAC ID: 6204720196
Enrollment ID: O20051215000870

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 Michael Warren Nielsen 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 Michael Warren Nielsen, MD
3603 Ingraham St,
San Diego, CA 92109-6717

Ph: (858) 353-3530
Dr Michael Warren Nielsen, MD
200 W Arbor Dr,
San Diego, CA 92103-9001

Ph: (619) 543-6236

Reviews and Comments


Emergency Medicine Doctors in San Diego, CA

Sarah Wilkinson, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 200 W Arbor Dr # 8819, San Diego, CA 92103
Phone: 956-458-9885    
Dr. Ramandeep Singh Dhillon, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5454 El Cajon Blvd, San Diego, CA 92115
Phone: 619-515-2400    
Phillip Edward Fry Jr., DO
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 34800 Bob Wilson Dr, San Diego, CA 92134
Phone: 619-532-6400    
Mina Kyrollus Ghobrial,
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 200 W Arbor Dr, San Diego, CA 92103
Phone: 800-926-8273    Fax: 888-539-8781
Dr. Timothy Stuart Hinman, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2001 4th Ave, San Diego, CA 92101
Phone: 858-499-2600    
Dr. Peter D. Aldrich, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 15025 Innovation Dr, San Diego, CA 92128
Phone: 858-554-8638    
Dr. Matthew J. Perl, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 15004 Innovation Dr, San Diego, CA 92128
Phone: 858-605-7171    

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.