NPPES file of Aug 9, 2026

Demetrios Nectarios Mallios, MD

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Los Angeles, CA

Demetrios Nectarios Mallios, MD is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in Los Angeles, California, and NPI 1144763095, issued on Nov 27, 2016. Check the license (California 146158, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1144763095
Name
Demetrios Nectarios Mallios
Credential
MD
Primary taxonomy
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
License number
146158 CA
Self-reported in NPPES; status is on the state search
Practice location
1520 San Pablo St, Los Angeles, CA 90033
Phone
(323) 442-5849
Enumerated
Nov 27, 2016
Record last updated
Nov 27, 2016 (not updated in 10 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20230807002538); accepts Medicare assignment
Medical or professional school
University Of Pittsburgh School Of Medicine, 2015
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 1520 San Pablo St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Frank Acosta, PHDPsychologist1750313490
  2. Gbemisola Adenuga, M.D.Nephrology Physician1952464661
  3. Aimee Aguillon, OTR/L, CHTOccupational Therapist1972677318
  4. Haig Aharonian, M.D.Internal Medicine Physician1205107653
  5. Jamshid Ahmadi, M.D.Neuroradiology Physician1942252028
  6. Mohammad Akmal, M.D.Nephrology Physician1356378087

Verify Demetrios Nectarios Mallios in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license 146158    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Industry payments in 2024: $442.84

4 payments; by number, the most common kind was food and beverage; the largest payer was Abiomed. The 4,047 providers of this specialty with any payment received $7,828.84 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Demetrios Mallios$442.84
  2. Specialty average$7,828.84

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Usc Care Medical Group IncLos Angeles, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers in California

There are 634 thoracic surgery (cardiothoracic vascular surgery) physician records in California.

All 634 in California → Every provider in Los Angeles →

Other thoracic surgery (cardiothoracic vascular surgery) physician records in California

  1. Kelechi Abanobi, M.DLos Angeles, CA1720236953
  2. Amir Abolhoda, MDOrange, CA1891875951
  3. Reginald Abraham, M DFountain Valley, CA1720042864
  4. Adrian Acuna HigakiLos Angeles, CA1831991454
  5. Robert Adamson, M.D.San Diego, CA1043292584
  6. Alaa Afifi, MDSanta Ana, CA1609802552
  7. Ricardo Aguirre, MDDanville, CA1699739219
  8. Palash Aiyer, MDSan Francisco, CA1649832213
  9. Andrew Akcelik, MDSan Francisco, CA1992298319
  10. Akbarshakh Akhmerov, MDWest Hollywood, CA1215464276

Common questions

What is Demetrios Nectarios Mallios, MD's NPI number?

Demetrios Nectarios Mallios, MD's National Provider Identifier (NPI) is 1144763095, issued on Nov 27, 2016. An NPI identifies a provider in billing; it is not a license.

Where is Demetrios Nectarios Mallios, MD located?

The NPPES record lists a practice address at 1520 San Pablo St, Los Angeles, CA, 90033. Phone: (323) 442-5849. Providers update this record themselves, so call before visiting.

How can I verify Demetrios Nectarios Mallios, MD's license?

NPPES lists California license number 146158, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.