Mark William Onaitis, MD - Medicare Thoracic Surgery in San Diego, CA

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Mark William Onaitis, MD is a medicare enrolled "Thoracic Surgery (cardiothoracic Vascular Surgery)" physician in San Diego, California. He went to Duke University School Of Medicine and graduated in 1997 and has 27 years of diverse experience with area of expertise as Thoracic Surgery. He is a member of the group practice Regents Of The University Of California and 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 (858) 657-7777.

Mark William Onaitis is licensed to practice in California (license number A144886) 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 1841310638.

Contact Information

Mark William Onaitis, MD
200 W Arbor Dr,
San Diego, CA 92103-9000
(858) 657-7777
(858) 657-5058

Map and Direction




Physician's Profile

Full NameMark William Onaitis
GenderMale
SpecialityThoracic Surgery
Experience27 Years
Location200 W Arbor Dr, San Diego, 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:
  • Mark William Onaitis attended and graduated from Duke University School Of Medicine in 1997
  NPI Data:
  • NPI Number: 1841310638
  • Provider Enumeration Date: 03/29/2007
  • Last Update Date: 02/21/2019
  Medicare PECOS Information:
  • PECOS PAC ID: 2769583194
  • Enrollment ID: I20161025002233

Medical Identifiers

Medical identifiers for Mark William Onaitis such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1841310638NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208G00000XThoracic Surgery (cardiothoracic Vascular Surgery) A144886 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Uc San Diego Health Hillcrest - Hillcrest Med CtrSan diego, CAHospital
Kaiser Foundation Hospital - ZionSan diego, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Regents Of The University Of California35774767611712

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. Mark William Onaitis allows following entities to bill medicare on his behalf.
Entity NameRegents Of The University Of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1376646869
PECOS PAC ID: 3577476761
Enrollment ID: O20031112000695
Entity NameRegents Of The University Of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1235232778
PECOS PAC ID: 3577476761
Enrollment ID: O20040920001143

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. Mark William Onaitis 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
Mark William Onaitis, MD
Po Box 232410,
San Diego, CA 92193-2410

Ph: () -		Mark William Onaitis, MD
200 W Arbor Dr,
San Diego, CA 92103-9000

Ph: (858) 657-7777

Reviews and Comments


Thoracic Surgery (Cardiothoracic Vascular Surgery) Doctors in San Diego, CA

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Dr. Daniel Lawrence Gramins, M.D.
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Phone: 858-552-8585    Fax: 858-552-7530
Srujan Ganta, MD
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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.

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.