John Byron Maccarthy, MD
Anesthesiology Physician · Fullerton, CA
John Byron Maccarthy, MD is an anesthesiology physician with a practice address in Fullerton, California, and NPI 1013969591, issued on May 16, 2006. Check the license (California G67046, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Byron Maccarthy
- Credential
- MD
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- G67046 CA
Self-reported in NPPES; status is on the state search - Practice location
- 101 E Valencia Mesa Dr, Fullerton, CA 92835
- Phone
- (714) 871-3280
- Enumerated
- May 16, 2006
- Record last updated
- Feb 19, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (714) 447-6490
- Medicaid ID
- 00G670460 CA
- Medicare enrollment
- Enrolled (PECOS I20101005000890); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 1986
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 7,571 in California → Look up another NPI →
Also registered at 101 E Valencia Mesa Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel Abbott, MDEmergency Medicine Physician1518907864
- Nelson Aguinaga, RN, FNPFamily Nurse Practitioner1043909609
- Jonathon Ahn, MDAnesthesiology Physician1053803882
- Sora Ahn, RNCritical Care Medicine Registered Nurse1730026493
- Sherry Ansari, DPTPhysical Medicine & Rehabilitation Physician1467972992
- Tandeep Bains, PHARM.D.Pharmacist1568958114
Verify John Byron Maccarthy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G67046Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $262.65
3 payments; by number, the most common kind was food and beverage; the largest payer was Heron Therapeutics, Inc. The 17,774 providers of this specialty with any payment received $669.59 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
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
- Allied Anesthesia Medical Group IncFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Byron Maccarthy among 7,571 anesthesiology physician records in California
John Byron Maccarthy, MD is one of 7,571 anesthesiology physician records with a practice address in California. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 53% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1986 · median 2006 among the 4,868 with a school on file
- Record last updated2015 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Anesthesiology Physician providers in California
There are 7,571 anesthesiology physician records in California.
All 7,571 in California → Every provider in Fullerton → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- David Bergman, DOFullerton, CA 928351801848866
- Richard Bollin, MDFullerton, CA 928351306898366
- Joseph Cochoit, MDFullerton, CA 928351679525612
- Renato Delcarmen, MDFullerton, CA 928351710938964
- Philip Demman, MDFullerton, CA 928351750332938
- Donald Galligan, DOFullerton, CA 928351205888245
- Michael Lillie, MDFullerton, CA 928351740231927
- Louis Lim, MDFullerton, CA 928351952353831
Common questions
What is John Byron Maccarthy, MD's NPI number?
John Byron Maccarthy, MD's National Provider Identifier (NPI) is 1013969591, issued on May 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Byron Maccarthy, MD located?
The NPPES record lists a practice address at 101 E Valencia Mesa Dr, Fullerton, CA, 92835. Phone: (714) 871-3280. Providers update this record themselves, so call before visiting.
How can I verify John Byron Maccarthy, MD's license?
NPPES lists California license number G67046, 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.
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.