Thaddeus O'Barr, M.D.
Anesthesiology Physician · Orange, CA
Thaddeus O'Barr, M.D. is an anesthesiology physician with a practice address in Orange, California, and NPI 1609168814, issued on May 5, 2011. Check the license (California A124438, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thaddeus O'Barr
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- A124438 CA
Self-reported in NPPES; status is on the state search - Practice location
- 681 S Parker St Ste 150, Orange, CA 92868
- Phone
- (714) 744-0900
- Enumerated
- May 5, 2011
- Record last updated
- Jun 10, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (714) 744-9232
- Medicare enrollment
- Enrolled (PECOS I20150611000315); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2011
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 7,571 in California → Look up another NPI →
Also registered at 681 S Parker St Ste 150
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Winnie Ruo, M.DAnesthesiology Physician1194767988
- Aalap Shah, M.D.Anesthesiology Physician1194014274
Verify Thaddeus O'Barr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A124438Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through 3 group practices
- Clarity Anesthesia Medical GroupNewport Beach, CA
- Orange Coast Anesthesia IncLos Alamitos, CA
- Premiercare Anesthesia Fountain Valley IncLong Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thaddeus O'Barr among 7,571 anesthesiology physician records in California
Thaddeus O'Barr, M.D. 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 2011, is newer than 68% of them.
- NPI issued2011 · 68% of these records are older, 30% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2011 · median 2006 among the 4,868 with a school on file
- Record last updated2019 · 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).
267 anesthesiology physician records list a practice address in Orange
They are 267 of the 13,245 NPPES records with a practice address in Orange, and 7,571 anesthesiology physician records in California.
All 7,571 in California → Every provider in Orange → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Brandon Abeyta, MDOrange, CA 928681841291804
- Angela Azar, MDOrange, CA 928681164494274
- Jonathan Cohen, M.D.Orange, CA 928681184691867
- Ralph Da Graca, MDOrange, CA 928681861430456
- Scott Engwall, MDOrange, CA 928681851378392
- Sheree Hsu, M.D.Orange, CA 928681265499032
- Brian Levine, MDOrange, CA 928681629032891
- Ingrid Manz, CRNAOrange, CA 928681578501417
Common questions
What is Thaddeus O'Barr, M.D.'s NPI number?
Thaddeus O'Barr, M.D.'s National Provider Identifier (NPI) is 1609168814, issued on May 5, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Thaddeus O'Barr, M.D. located?
The NPPES record lists a practice address at 681 S Parker St Ste 150, Orange, CA, 92868. Phone: (714) 744-0900. Providers update this record themselves, so call before visiting.
How can I verify Thaddeus O'Barr, M.D.'s license?
NPPES lists California license number A124438, 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.