NPPES file of Aug 9, 2026

Warren O. Kessler, MD

Specialist · San Diego, CA

Warren O. Kessler, MD is a specialist with a practice address in San Diego, California, and NPI 1962439125, issued on Jun 26, 2006. Check the license (California C29578, as entered in NPPES) with the California board that licenses this profession; 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
1962439125
Name
Warren O. Kessler
Credential
MD
Primary taxonomy
Specialist 174400000X
License number
C29578 CA
Self-reported in NPPES; status is on the state search
Practice location
4060 4TH Ave, San Diego, CA 92103
Phone
(619) 297-4707
Enumerated
Jun 26, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(619) 297-2448
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 specialist records → All 5,749 in California → Look up another NPI →

Also registered at 4060 4TH Ave

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

  1. John Aalbers, M.D.Neurology Physician1942262431
  2. Judy Adler, M.D.Nephrology Physician1326043894
  3. Joel Baranski, M.D.Nephrology Physician1548265234
  4. Christin Bawa, ATC, PA-CPhysician Assistant1013126044
  5. Luann Beacom, N.P.Nurse Practitioner1760578538
  6. Carrie Bitsko, A.T.C.Athletic Trainer1053519934

Verify Warren O. Kessler in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license C29578    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
Find the California license search

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Warren O. Kessler among 5,749 specialist records in California

Warren O. Kessler, MD is one of 5,749 specialist records with a practice address in California. 30% 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 7% of them.

  • NPI issued2006 · 7% of these records are older, 60% newer
  • In a Medicare fileNo · 30% of these records are
  • In the CMS Doctors and Clinicians fileNo · 19% of these records are
  • Record last updated2007 · 77% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Specialist providers in California

There are 5,749 specialist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 5,749 in California → Every provider in San Diego → Specialist nationwide →

The 8 specialist records with the nearest ZIP codes

  1. Ron AuerbacherSan Diego, CA 921031467592097
  2. Richard Braun, M.D.San Diego, CA 921031639166291
  3. Richard Burns, M.D.San Diego, CA 921031902856818
  4. James Grant, MDSan Diego, CA 921031013098664
  5. Jean-Francois Leroux, M.DSan Diego, CA 921031538232673
  6. Gary Miya, M.DSan Diego, CA 921031841219482
  7. James Powers, MDSan Diego, CA 921031629059100
  8. Fakhri Salem, M.D.San Diego, CA 921031659416485

Common questions

What is Warren O. Kessler, MD's NPI number?

Warren O. Kessler, MD's National Provider Identifier (NPI) is 1962439125, issued on Jun 26, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Warren O. Kessler, MD located?

The NPPES record lists a practice address at 4060 4TH Ave, San Diego, CA, 92103. Phone: (619) 297-4707. Providers update this record themselves, so call before visiting.

How can I verify Warren O. Kessler, MD's license?

NPPES lists California license number C29578, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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. 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.