MARK WILLIAM ONAITIS MD
NPI 1841310638
Thoracic Surgery (Cardiothoracic Vascular Surgery) in San Diego, CA

Q: What is Mark Onaitis's NPI number?

The NPI number for Mark Onaitis is 1841310638. It was assigned to this individual provider in the NPPES registry on March 29, 2007.

Q: What is Mark Onaitis's specialty?

The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.

Q: When was this NPI record last updated?

The NPPES record for Mark Onaitis was last updated on February 21, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 29, 2007PECOS EnrolledAccepts Medicare Assignment

200 W ARBOR DR, SAN DIEGO, CA 92103(858) 657-7777(858) 657-5058 Get Directions Write a Review

NPPES record last updated: February 21, 2019. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 21, 2019, Oct 12, 2016 (2 updates tracked since 2016).

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About Mark William Onaitis Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK WILLIAM ONAITIS MD (NPI 1841310638) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in San Diego, California, licensed in California (A144886) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS and is a graduate of Duke University School Of Medicine (1997).

NPPES Registry Identity

NPI1841310638

Entity TypeIndividualMale

Primary Taxonomy208G00000X

Provider Legal NameMARK WILLIAM ONAITISCredential: MD

Location Address200 W ARBOR DRSan Diego, CA 92103-9000

Mailing AddressPo Box 232410San Diego, CA 92193-2410

Phone(858) 657-7777

Fax(858) 657-5058

Sole ProprietorNo

Medical School CMSDuke University School Of MedicineGraduated 1997

Enumeration DateMarch 29, 2007

Last NPPES UpdateFebruary 21, 20192 updates tracked since enumeration

✔ NPI 1841310638 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyThoracic Surgery (Cardiothoracic Vascular Surgery)Allopathic & Osteopathic Physicians

Taxonomy Code208G00000X

License✔ Licensed in CA · A144886

Definition

A thoracic surgeon provides the operative, perioperative and critical care of patients with pathologic conditions within the chest. Included is the surgical care of coronary artery disease, cancers of the lung, esophagus and chest wall, abnormalities of the trachea, abnormalities of the great vessels and heart valves, congenital anomalies, tumors of the mediastinum and diseases of the diaphragm. The management of the airway and injuries of the chest is within the scope of the specialty.

200 W ARBOR DR, San Diego, CA 92103

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mark William Onaitis Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2769583194

PECOS Enrollment IDI20161025002233

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Mark Onaitis reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Regents Of The University Of California - Ucsd Medical Group

Same address

Gastroenterology

200 W ARBOR DR
San Diego, CA 92103

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Regents Of The University Of California
Also billed through NPI 1235232778 (California)
1,051 clinicians in this Medicare group

NPI 1336267137 (800) 926-8273

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 8

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

38 services38 patients

Removal of lymph nodes of chest cavity using an endoscope 32674

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to access and remove lymph nodes in the chest cavity. It's a minimally invasive method, which can help in diagnosing or treating certain conditions.

34 services34 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

25 services17 patients

Removal of segment of lung tissue using an endoscope 32669

This procedure involves using a thin, flexible tool called an endoscope to remove a small part of lung tissue. It's typically done to diagnose or treat lung conditions. You may feel some discomfort, but the procedure is generally safe and effective.

23 services22 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

19 services19 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

19 services18 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92103 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$184.71 typical visit price

range $62.10 – $184.71

Typical copayment $46.17 (range $15.52 – $46.17)

Most-billed visit code 99205

Established Patient

$76.87 typical visit price

range $20.62 – $151.42

Typical copayment $19.21 (range $5.15 – $37.85)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431

DME-Oxygen and Supplies · category DC000N

2 suppliers12 claims14 services$14.02 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

4 suppliers26 claims28 services$71.23 avg. paid by Medicare

Portable oxygen concentrator, rental E1392

DME-Oxygen and Supplies · category DC002N

2 suppliers14 claims14 services$32.96 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

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