Joanne Mortimer, M.D.
Medical Oncology Physician · Duarte, CA
Joanne Mortimer, M.D. is a medical oncology physician with a practice address in Duarte, California, and NPI 1558319038, issued on May 5, 2006. Check the license (California G87336, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joanne Mortimer
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- G87336 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 Duarte RD, Duarte, CA 91010
- Phone
- (626) 359-8111
- Enumerated
- May 5, 2006
- Record last updated
- Nov 18, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 00G873360 CA
- Medicare enrollment
- Enrolled (PECOS I20050404001080); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 1977
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 1500 Duarte RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Vaibhav Agrawal, M.D.Hematology & Oncology Physician1538402565
Verify Joanne Mortimer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G87336Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average medical oncology physician in 2024
330 Medicare Part D claims for 103 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 30% of claims. 20 claims were for opioids.
Most prescribed
- Kisqali44 claims
- Anastrozole39 claims
- Letrozole27 claims
- Ibrance14 claims
- Zolpidem Tartrate13 claims
- Prochlorperazine Maleate11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 99.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $9,927.98
6 payments; by number, the most common kind was consulting fee; the largest payer was AstraZeneca Pharmaceuticals LP. The 3,343 providers of this specialty with any payment received $11,773.47 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- City OF Hope Medical FoundationDuarte, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joanne Mortimer among 447 medical oncology physician records in California
Joanne Mortimer, M.D. is one of 447 medical oncology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1977 · median 2004 among the 312 with a school on file
- Record last updated2020 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
48 medical oncology physician records list a practice address in Duarte
They are 48 of the 1,287 NPPES records with a practice address in Duarte, and 447 medical oncology physician records in California.
All 447 in California → Every provider in Duarte → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Linda Bosserman, M.D., F.A.C.PDuarte, CA 910101346289824
- Cathie Chung, M.D.Duarte, CA 910101679599914
- Lee Cranmer, MD, PHDDuarte, CA 910101861465759
- Tanya Dorff, M.D.Duarte, CA 910101508879115
- Manana Elia, M.D.Duarte, CA 910101609841816
- Marwan Fakih, MDDuarte, CA 910101861498271
- Marianna Koczywas, MDDuarte, CA 910101639286677
- Dean Lim, MDDuarte, CA 910101790892735
Common questions
What is Joanne Mortimer, M.D.'s NPI number?
Joanne Mortimer, M.D.'s National Provider Identifier (NPI) is 1558319038, issued on May 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joanne Mortimer, M.D. located?
The NPPES record lists a practice address at 1500 Duarte RD, Duarte, CA, 91010. Phone: (626) 359-8111. Providers update this record themselves, so call before visiting.
How can I verify Joanne Mortimer, M.D.'s license?
NPPES lists California license number G87336, 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 Joanne Mortimer, M.D. prescribe under Medicare Part D?
In 2024, Joanne Mortimer, M.D. had 330 Medicare Part D claims for 103 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
What is Joanne Mortimer, M.D.'s MIPS final score?
The 2023 MIPS final score is 99.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.