NPPES file of Aug 9, 2026

Lois M. O'Brien, M.D.

Pain Medicine (Anesthesiology) Physician · Santa Monica, CA

Lois M. O'Brien, M.D. is a pain medicine (anesthesiology) physician with a practice address in Santa Monica, California, and NPI 1437245339, issued on Oct 5, 2006. Check the license (California A24195, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1437245339
Name
Lois M. O'Brien
Credential
M.D.
Primary taxonomy
Pain Medicine (Anesthesiology) Physician 207LP2900X
License number
A24195 CA
Self-reported in NPPES; status is on the state search
Practice location
1328 22ND St, Santa Monica, CA 90404
Phone
(310) 471-5852
Enumerated
Oct 5, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(310) 471-3958
Medicaid ID
GR0017930 CA
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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8 nearest pain medicine (anesthesiology) physician records → All 536 in California → Look up another NPI →

Also registered at 1328 22ND St

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

  1. Laura Alexander, MDAnesthesiology Physician1699763094
  2. Warren Allen, M.D.Cytopathology Physician1801850722
  3. Sophie Andriaschuk, M.D.Anesthesiology Physician1063421378
  4. Alice Chung, M.D.Surgical Oncology Physician1326296542
  5. James Cowman, M.D.Anesthesiology Physician1770696510
  6. George Edwards, M.D.Nuclear Medicine Physician1538125489

Verify Lois M. O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A24195    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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Lois M. O'Brien among 536 pain medicine (anesthesiology) physician records in California

Lois M. O'Brien, M.D. is one of 536 pain medicine (anesthesiology) physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.

  • NPI issued2006 · 5% of these records are older, 57% newer
  • In a Medicare fileNo · 83% of these records are
  • In the CMS Doctors and Clinicians fileNo · 68% of these records are
  • Record last updated2007 · 51% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207LP2900X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pain Medicine (Anesthesiology) Physician providers in California

There are 536 pain medicine (anesthesiology) physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 536 in California → Every provider in Santa Monica → Pain Medicine (Anesthesiology) Physician nationwide →

The 8 pain medicine (anesthesiology) physician records with the nearest ZIP codes

  1. Charles Louy, MDSanta Monica, CA 904041275531717
  2. Gerald Sacks, M.D.Santa Monica, CA 904041205906781
  3. Patricia Wynn-JonesTorrance, CA 905031396878377
  4. Haruo Arita, MDTorrance, CA 905051154372852
  5. Ripu Arora, MDTorrance, CA 905051821001629
  6. David Cho, M.D.Torrance, CA 905051295976488
  7. Fabian Proano, MDTorrance, CA 905051932219169
  8. Katrina Von Kriegenbergh, MDTorrance, CA 905051013270867

Common questions

What is Lois M. O'Brien, M.D.'s NPI number?

Lois M. O'Brien, M.D.'s National Provider Identifier (NPI) is 1437245339, issued on Oct 5, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Lois M. O'Brien, M.D. located?

The NPPES record lists a practice address at 1328 22ND St, Santa Monica, CA, 90404. Phone: (310) 471-5852. Providers update this record themselves, so call before visiting.

How can I verify Lois M. O'Brien, M.D.'s license?

NPPES lists California license number A24195, 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. 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.