Catherine Maria Challender, MD, MPH
Internal Medicine Physician · La Jolla, CA
Catherine Maria Challender, MD, MPH is an internal medicine physician with a practice address in La Jolla, California, and NPI 1336567866, issued on Apr 1, 2014. Check the license (California A138525, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Catherine Maria Challender
- Credential
- MD, MPH
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A138525 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9850 Genesee Ave Ste 900, La Jolla, CA 92037
- Phone
- (858) 626-7780
- Enumerated
- Apr 1, 2014
- Record last updated
- Nov 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20171116002094); accepts Medicare assignment
- Medical or professional school
- Chicago College Of Medicine And Surgery, 2014
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 9850 Genesee Ave Ste 900
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Catherine Maria Challender in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A138525Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
269 Medicare Part D claims for 95 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Pantoprazole Sodium16 claims
- Atorvastatin Calcium11 claims
- Nitroglycerin11 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.
Bills Medicare through one group practice
- Ximed Hospitalists, Inc.La Jolla, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Maria Challender among 17,696 internal medicine physician records in California
Catherine Maria Challender, MD, MPH is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2014 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
158 internal medicine physician records list a practice address in La Jolla
They are 158 of the 3,648 NPPES records with a practice address in La Jolla, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in La Jolla → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Neil Farber, MDLa Jolla, CA 920371043295363
- Shipra Khushu, M.D.La Jolla, CA 920371235118936
Common questions
What is Catherine Maria Challender, MD, MPH's NPI number?
Catherine Maria Challender, MD, MPH's National Provider Identifier (NPI) is 1336567866, issued on Apr 1, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Maria Challender, MD, MPH located?
The NPPES record lists a practice address at 9850 Genesee Ave Ste 900, La Jolla, CA, 92037. Phone: (858) 626-7780. Providers update this record themselves, so call before visiting.
How can I verify Catherine Maria Challender, MD, MPH's license?
NPPES lists California license number A138525, 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 Catherine Maria Challender, MD, MPH prescribe under Medicare Part D?
In 2024, Catherine Maria Challender, MD, MPH had 269 Medicare Part D claims for 95 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.