John Matthew Timmerman, MD
Hematology & Oncology Physician · Los Angeles, CA
John Matthew Timmerman, MD is a hematology & oncology physician with a practice address in Los Angeles, California, and NPI 1891715090, issued on Jul 20, 2006. Check the license (California G76297, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Matthew Timmerman
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- G76297 CA
G76297A CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Medical Plaza, Los Angeles, CA 90095
- Phone
- (310) 794-5511
- Enumerated
- Jul 20, 2006
- Record last updated
- Jan 23, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (310) 206-5511
- Medicaid ID
- 00G762970 CA
- Medicare enrollment
- Enrolled (PECOS I20060501000320); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 200 Medical Plaza
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Parviz Amid, M.D.Surgery Physician1073633459
- Adrienne Bawa, REGISTERED NURSECase Management Registered Nurse1497355366
Verify John Matthew Timmerman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G76297Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
54 Medicare Part D claims for 13 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 69% of claims.
Most prescribed
- Brukinsa19 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): 86.1 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: $83.01
1 payment: food and beverage; the largest payer was Kite Pharma, Inc. The 8,560 providers of this specialty with any payment received $7,481.41 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
- The Regents OF The University OF CaliforniaLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Matthew Timmerman among 1,583 hematology & oncology physician records in California
John Matthew Timmerman, MD is one of 1,583 hematology & oncology physician records with a practice address in California. 83% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 54% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1991 · median 2003 among the 1,124 with a school on file
- Record last updated2013 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Los Angeles → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- David Chang, MDLos Angeles, CA 900951952336737
- Grace Cherry, NPLos Angeles, CA 900951659306447
- Sven De Vos, MDLos Angeles, CA 900951528093713
- Aryeh Edelist, MDLos Angeles, CA 900951437184629
- Christos Emmanouilides, MDLos Angeles, CA 900951780600619
- Nancy Feldman, MDLos Angeles, CA 900951538184700
- Jennifer Gansert, MDLos Angeles, CA 900951811922412
- Patricia Ganz, MDLos Angeles, CA 900951871528471
Common questions
What is John Matthew Timmerman, MD's NPI number?
John Matthew Timmerman, MD's National Provider Identifier (NPI) is 1891715090, issued on Jul 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Matthew Timmerman, MD located?
The NPPES record lists a practice address at 200 Medical Plaza, Los Angeles, CA, 90095. Phone: (310) 794-5511. Providers update this record themselves, so call before visiting.
How can I verify John Matthew Timmerman, MD's license?
NPPES lists California license number G76297, 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 John Matthew Timmerman, MD prescribe under Medicare Part D?
In 2024, John Matthew Timmerman, MD had 54 Medicare Part D claims for 13 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is John Matthew Timmerman, MD's MIPS final score?
The 2023 MIPS final score is 86.1 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.