Ernest Ivan Katler, M.D.
Rheumatology Physician · San Pablo, CA
Ernest Ivan Katler, M.D. is a rheumatology physician with a practice address in San Pablo, California, and NPI 1184770638, issued on Jan 26, 2007. Check the license (California A24404, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ernest Ivan Katler
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- A24404 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2101 Vale Road, San Pablo, CA 94806
- Phone
- (510) 620-0496
- Enumerated
- Jan 26, 2007
- Record last updated
- Feb 11, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (510) 233-0538
- Medicaid ID
- 00A244040 CA
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Verify Ernest Ivan Katler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A24404Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average rheumatology physician in 2024
12 Medicare Part D claims, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Ernest Ivan Katler among 926 rheumatology physician records in California
Ernest Ivan Katler, 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. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2015 · 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.
All 926 in California → Every provider in San Pablo → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Robert Goldfien, MDRichmond, CA 948011003991779
- Cianna Leatherwood, MDRichmond, CA 948011003175746
- David Chernoff, MDSan Rafael, CA 949011164759312
- Jerry Rosenbaum, M.DSan Rafael, CA 949011700907896
- Izza Bazigh, M.DSan Rafael, CA 949031679196836
- Neal Birnbaum, M.D.San Rafael, CA 949031437142882
- Maurice Kinsolving, MDSan Rafael, CA 949031033293006
- Elizabeth Smith, MDGreenbrae, CA 949041235230525
Common questions
What is Ernest Ivan Katler, M.D.'s NPI number?
Ernest Ivan Katler, M.D.'s National Provider Identifier (NPI) is 1184770638, issued on Jan 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ernest Ivan Katler, M.D. located?
The NPPES record lists a practice address at 2101 Vale Road, San Pablo, CA, 94806. Phone: (510) 620-0496. Providers update this record themselves, so call before visiting.
How can I verify Ernest Ivan Katler, M.D.'s license?
NPPES lists California license number A24404, 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.
How much does Ernest Ivan Katler, M.D. prescribe under Medicare Part D?
In 2024, Ernest Ivan Katler, M.D. had 12 Medicare Part D claims; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions 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. 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.