Dr Alex John Messina, MD - Medicare Internal Medicine in Santa Monica, CA

Dr Alex John Messina, MD is a medicare enrolled "Internal Medicine" physician in Santa Monica, California. He graduated from medical school in 1965 and has 59 years of diverse experience with area of expertise as Internal Medicine. His current practice location is 2021 Santa Monica Blvd, #101e, Santa Monica, California. You can reach out to his office (for appointments etc.) via phone at (310) 453-1103.

Dr Alex John Messina is licensed to practice in California (license number A23984) 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 1902867823.

Contact Information

Dr Alex John Messina, MD
2021 Santa Monica Blvd, #101e,
Santa Monica, CA 90404
(310) 453-1103
(310) 453-9633

Map and Direction




Physician's Profile

Full NameDr Alex John Messina
GenderMale
SpecialityInternal Medicine
Experience59 Years
Location2021 Santa Monica Blvd, Santa Monica, 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:
  • Dr Alex John Messina graduated from medical school in 1965
  NPI Data:
  • NPI Number: 1902867823
  • Provider Enumeration Date: 03/30/2006
  • Last Update Date: 03/07/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 0547310252
  • Enrollment ID: I20090617000585

Medical Identifiers

Medical identifiers for Dr Alex John Messina such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1902867823NPI-NPPES
A23984OtherSTATE LICENSE NUMBER
952845053OtherFED TAX ID NO

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine A23984 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Providence Saint John's Health CenterSanta monica, CAHospital

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 Alex John Messina allows following entities to bill medicare on his behalf.
Entity NameAlex J. Messina M D Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1962638312
PECOS PAC ID: 1355491069
Enrollment ID: O20090617000601

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 Alex John Messina 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 Alex John Messina, MD
2021 Santa Monica Blvd, Ste 101e,
Santa Monica, CA 90404

Ph: (310) 453-1103
Dr Alex John Messina, MD
2021 Santa Monica Blvd, #101e,
Santa Monica, CA 90404

Ph: (310) 453-1103

Reviews and Comments


Internal Medicine Doctors in Santa Monica, CA

Irawan Susanto, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1223 16th St, Suite 3400, Santa Monica, CA 90404
Phone: 310-449-0939    Fax: 424-259-7790
Louis Ravitz, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 2336 Santa Monica Blvd, Suite 207, Santa Monica, CA 90404
Phone: 310-828-9311    Fax: 310-453-8533
Janet Winikoff, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 2001 Santa Monica Blvd Ste 860, Santa Monica, CA 90404
Phone: 310-828-3209    Fax: 310-828-5165
Dr. Sean Dooley, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2121 Santa Monica Blvd, Santa Monica, CA 90404
Phone: 323-829-8745    
Lorraine Anderson, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1245 16th St Ste 303, Santa Monica, CA 90404
Phone: 310-481-4646    Fax: 310-899-7599
Dr. Colleen Lucy Channick, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1223 16th St Ste 3400, Santa Monica, CA 90404
Phone: 310-449-0939    
Carol Yukiko Nishikubo, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2001 Santa Monica Blvd Ste 560w, Santa Monica, CA 90404
Phone: 310-453-5654    Fax: 310-453-6885

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.