NPPES file of Aug 9, 2026

Ming-Sing Si, M.D.

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

Ming-Sing Si, M.D. is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in Los Angeles, California, and NPI 1093932261, issued on Apr 19, 2007. Check the license (California A175671, 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 2023 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1093932261
Name
Ming-Sing Si
Credential
M.D.
Primary taxonomy
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
License numbers
A175671 CA
A75671 CA
4301087555 MI
Self-reported in NPPES; status is on the state search
Practice location
100 Ucla Medical Plz Ste 630, Los Angeles, CA 90024
Phone
(310) 825-9011
Enumerated
Apr 19, 2007
Record last updated
Sep 2, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20210831000884); accepts Medicare assignment
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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8 nearest thoracic surgery (cardiothoracic vascular surgery) physician records → All 634 in California → Look up another NPI →

Also registered at 100 Ucla Medical Plz Ste 630

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

  1. Jamil Aboulhosn, MDCardiovascular Disease Physician1356382717
  2. Olcay Aksoy, M.D.Cardiovascular Disease Physician1881748630
  3. Sabina Aleksandrovskaya, AGACNPAcute Care Nurse Practitioner1952072845
  4. Arnold Baas, MDCardiovascular Disease Physician1720013717
  5. Stefanie Brennan, NPAdult Health Nurse Practitioner1396117800
  6. Nicholas Brownell, M.D.Cardiovascular Disease Physician1285020487

Verify Ming-Sing Si in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A175671    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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The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100

The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.

  1. Qualityout of 100 · 30% of the final score95.7
  2. Costout of 100 · 30%81.6
  3. Promoting interoperabilityout of 100 · 25%100.0
  4. Improvement activities40 of 40 points · 15%100.0

Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).

Bills Medicare through one group practice

  1. The Regents OF The University OF CaliforniaLos Angeles, CA

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

Ming-Sing Si among 634 thoracic surgery (cardiothoracic vascular surgery) physician records in California

Ming-Sing Si, M.D. is one of 634 thoracic surgery (cardiothoracic vascular surgery) physician records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 55% of them.

  • NPI issued2007 · 55% of these records are older, 37% newer
  • In a Medicare fileYes · 75% of these records are
  • In the CMS Doctors and Clinicians fileYes · 64% of these records are
  • Graduated1999 · median 1997 among the 408 with a school on file
  • Record last updated2021 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208G00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (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 → Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician nationwide →

The 8 thoracic surgery (cardiothoracic vascular surgery) physician records with the nearest ZIP codes

  1. Malini Daniel, MDLos Angeles, CA 900241982083630
  2. Hillel Laks, M.D.Los Angeles, CA 900241679612287
  3. Yas SanaihaLos Angeles, CA 900241194110593
  4. Richard Shemin, M.D.Los Angeles, CA 900241487608378
  5. Glen Van Arsdell, MDLos Angeles, CA 900241871072553
  6. Robert Cameron, MDLos Angeles, CA 900251376578377
  7. Harold Tabaie, MDLos Angeles, CA 900221346286663
  8. Michael Chang, MD, MPHLos Angeles, CA 900271881681914

Common questions

What is Ming-Sing Si, M.D.'s NPI number?

Ming-Sing Si, M.D.'s National Provider Identifier (NPI) is 1093932261, issued on Apr 19, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Ming-Sing Si, M.D. located?

The NPPES record lists a practice address at 100 Ucla Medical Plz Ste 630, Los Angeles, CA, 90024. Phone: (310) 825-9011. Providers update this record themselves, so call before visiting.

How can I verify Ming-Sing Si, M.D.'s license?

NPPES lists California license number A175671, 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.

What is Ming-Sing Si, M.D.'s MIPS final score?

The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.

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.