NPPES file of Aug 9, 2026

Barton Thomas Billeci, MD

Adolescent Medicine (Internal Medicine) Physician · Irvine, CA

Barton Thomas Billeci, MD is an adolescent medicine (internal medicine) physician with a practice address in Irvine, California, and NPI 1154407237, issued on Oct 31, 2006. Check the license (California G0768740, 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
1154407237
Name
Barton Thomas Billeci
Credential
MD
Primary taxonomy
Adolescent Medicine (Internal Medicine) Physician 207RA0000X
License number
G0768740 CA
Self-reported in NPPES; status is on the state search
Practice location
4050 Barranca Pkwy, Irvine, CA 92604
Phone
(949) 653-1173
Enumerated
Oct 31, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(949) 653-1152
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 4050 Barranca Pkwy

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

  1. Robila Ashfaq, M.DFamily Medicine Physician1609048396
  2. Fredric Balguma, DOFamily Medicine Physician1902069578
  3. Gunjan Bhatnagar, M.D.Obstetrics & Gynecology Physician1962403667
  4. Jon Biorkman, MDFamily Medicine Physician1023008679
  5. Betty Chen, D.D.S., M.S.Orthodontics and Dentofacial Orthopedics Dentistry1902173362
  6. Chienwei Chen, MDInternal Medicine Physician1992795256

Verify Barton Thomas Billeci in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G0768740    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

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42% fewer Medicare Part D claims than the average adolescent medicine (internal medicine) physician in 2024

2,107 Medicare Part D claims for 218 beneficiaries, against an average of 3,639 among the 177 providers of this specialty who prescribed in Part D. 22 claims were for opioids.

  1. Barton Billeci2,107
  2. Specialty average3,639

Most prescribed

  1. Amlodipine Besylate157 claims
  2. Losartan Potassium116 claims
  3. Atorvastatin Calcium107 claims
  4. Hydrochlorothiazide94 claims
  5. Rosuvastatin Calcium90 claims
  6. Azithromycin77 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Adolescent Medicine (Internal Medicine) Physician providers in California

There are 30 adolescent medicine (internal medicine) physician records in California.

All 30 in California → Every provider in Irvine →

Other adolescent medicine (internal medicine) physician records in California

  1. Arturo Abalos, MDDelano, CA1801988142
  2. Jyoti Bakhru, M.D.Los Alamitos, CA1003833948
  3. Sina Bakhshaei, M.D.Temecula, CA1285253237
  4. Lofty Basta, MDSan Francisco, CA1730314378
  5. Albina Benabaye, M.D.Stockton, CA1346239613
  6. Lindsey Brucker, M.D.Torrance, CA1669762688
  7. Jessica Combs, M.D.Beverly Hills, CA1952773244
  8. Hoang Dong, MDSan Diego, CA1841473154
  9. Tracy Exley, M.DSan Jose, CA1033314794
  10. Shigeki Fujitani, MDCulver City, CA1497844864

Common questions

What is Barton Thomas Billeci, MD's NPI number?

Barton Thomas Billeci, MD's National Provider Identifier (NPI) is 1154407237, issued on Oct 31, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Barton Thomas Billeci, MD located?

The NPPES record lists a practice address at 4050 Barranca Pkwy, Irvine, CA, 92604. Phone: (949) 653-1173. Providers update this record themselves, so call before visiting.

How can I verify Barton Thomas Billeci, MD's license?

NPPES lists California license number G0768740, 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.

How much does Barton Thomas Billeci, MD prescribe under Medicare Part D?

In 2024, Barton Thomas Billeci, MD had 2,107 Medicare Part D claims for 218 beneficiaries; the average among adolescent medicine (internal medicine) physician prescribers was 3,639. Part D covers Medicare prescriptions only.

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.