NPPES file of Aug 9, 2026

John M. Loeb, M.D.

Rheumatology Physician · Walnut Creek, CA

John M. Loeb, M.D. is a rheumatology physician with a practice address in Walnut Creek, California, and NPI 1932106390, issued on Jun 30, 2005. Check the license (California G29097, 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
1932106390
Name
John M. Loeb
Credential
M.D.
Primary taxonomy
Rheumatology Physician 207RR0500X
License number
G29097 CA
Self-reported in NPPES; status is on the state search
Practice location
120 LA Casa Via, Walnut Creek, CA 94598
Phone
(925) 210-1050
Enumerated
Jun 30, 2005
Record last updated
Jul 28, 2010 (not updated in 16 years: call before relying on the address or phone)
Fax
(921) 210-1082
Medicaid ID
00G290970 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.
Download card Updates feed

8 nearest rheumatology physician records → All 926 in California → Look up another NPI →

Also registered at 120 LA Casa Via

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

  1. Rashmi Dixit, M.D.Rheumatology Physician1811990666
  2. Zuzana Foster, M.D.Rheumatology Physician1184621542
  3. Janelle Gonsalves, PTAPhysical Therapist1770635468
  4. Ashley Gruendl, P.T.Physical Therapist1588062442
  5. Henry Kung, M.D.Gastroenterology Physician1518941673
  6. Tighe Ohanrahan, MDFamily Medicine Physician1316977846

Verify John M. Loeb in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G29097    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

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

John M. Loeb among 926 rheumatology physician records in California

John M. Loeb, M.D. is one of 926 rheumatology physician records with a practice address in California. 81% 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 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 94% newer
  • In a Medicare fileNo · 81% of these records are
  • In the CMS Doctors and Clinicians fileNo · 69% of these records are
  • Record last updated2010 · 62% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Rheumatology Physician providers in California

There are 926 rheumatology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 926 in California → Every provider in Walnut Creek → Rheumatology Physician nationwide →

The 8 rheumatology physician records with the nearest ZIP codes

  1. Rashmi Dixit, M.D.Walnut Creek, CA 945981811990666
  2. Zuzana Foster, M.D.Walnut Creek, CA 945981184621542
  3. Robert Wiskocil, MDWalnut Creek, CA 945981992883094
  4. David Wu, MDWalnut Creek, CA 945981023015484
  5. Saba Ziaee, MDWalnut Creek, CA 945981396004107
  6. Midori Nishio, M.D.Walnut Creek, CA 945971316010366
  7. Raul Romea, MDWalnut Creek, CA 945971962408112
  8. Vandana Sharma, M.D.Walnut Creek, CA 945971528131588

Common questions

What is John M. Loeb, M.D.'s NPI number?

John M. Loeb, M.D.'s National Provider Identifier (NPI) is 1932106390, issued on Jun 30, 2005. An NPI identifies a provider in billing; it is not a license.

Where is John M. Loeb, M.D. located?

The NPPES record lists a practice address at 120 LA Casa Via, Walnut Creek, CA, 94598. Phone: (925) 210-1050. Providers update this record themselves, so call before visiting.

How can I verify John M. Loeb, M.D.'s license?

NPPES lists California license number G29097, 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.