NPPES file of Aug 9, 2026

Charlton Byun, M.D.

Diagnostic Radiology Physician · Long Beach, CA

Charlton Byun, M.D. is a diagnostic radiology physician with a practice address in Long Beach, California, and NPI 1225340961, issued on Jul 10, 2010. Check the license (California C54035, 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 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1225340961
Name
Charlton Byun
Credential
M.D.
Primary taxonomy
Diagnostic Radiology Physician 2085R0202X
License number
C54035 CA
Self-reported in NPPES; status is on the state search
Practice location
4241 Long Beach Blvd, Long Beach, CA 90807
Phone
(562) 912-2507
Enumerated
Jul 10, 2010
Record last updated
Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
Fax
(484) 918-2507
Medicare enrollment
Enrolled (PECOS I20130110000571); accepts Medicare assignment
Medical or professional school
State University Of New York At Buffalo School Of Medicine, 2003
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 diagnostic radiology physician records → All 4,500 in California → Look up another NPI →

Also registered at 4241 Long Beach Blvd

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

  1. Timothy Bell, MDDiagnostic Radiology Physician1073596573
  2. James Hyun, MDDiagnostic Radiology Physician1518941624
  3. Dong Kim, MDDiagnostic Radiology Physician1457633919
  4. Darissa Kon, MDDiagnostic Radiology Physician1154304640
  5. Cynthia Lloyd, MDDiagnostic Radiology Physician1891778379
  6. Kourosh Nourisamie, MDDiagnostic Radiology Physician1124000757

Verify Charlton Byun in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license C54035    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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Bills Medicare through one group practice

  1. Sharp Rees-Stealy Medical Group IncSan Diego, CA

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

Charlton Byun among 4,500 diagnostic radiology physician records in California

Charlton Byun, M.D. is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 67% of them.

  • NPI issued2010 · 67% of these records are older, 30% newer
  • In a Medicare fileYes · 74% of these records are
  • In the CMS Doctors and Clinicians fileYes · 70% of these records are
  • Graduated2003 · median 2004 among the 3,130 with a school on file
  • Record last updated2021 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Diagnostic Radiology Physician providers in California

There are 4,500 diagnostic radiology physician records in California.

All 4,500 in California → Every provider in Long Beach → Diagnostic Radiology Physician nationwide →

The 8 diagnostic radiology physician records with the nearest ZIP codes

  1. Timothy Bell, MDLong Beach, CA 908071073596573
  2. James Hyun, MDLong Beach, CA 908071518941624
  3. Dong Kim, MDLong Beach, CA 908071457633919
  4. Darissa Kon, MDLong Beach, CA 908071154304640
  5. Cynthia Lloyd, MDLong Beach, CA 908071891778379
  6. Kourosh Nourisamie, MDLong Beach, CA 908071124000757
  7. Gabriel Ramirez, MDLong Beach, CA 908071336125020
  8. Bach Vu, MDLong Beach, CA 908071790769891

Common questions

What is Charlton Byun, M.D.'s NPI number?

Charlton Byun, M.D.'s National Provider Identifier (NPI) is 1225340961, issued on Jul 10, 2010. An NPI identifies a provider in billing; it is not a license.

Where is Charlton Byun, M.D. located?

The NPPES record lists a practice address at 4241 Long Beach Blvd, Long Beach, CA, 90807. Phone: (562) 912-2507. Providers update this record themselves, so call before visiting.

How can I verify Charlton Byun, M.D.'s license?

NPPES lists California license number C54035, 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.