Collin Thomas Zimmerman, MD
Hematology & Oncology Physician · San Diego, CA
Collin Thomas Zimmerman, MD is a hematology & oncology physician with a practice address in San Diego, California, and NPI 1396975256, issued on Jul 24, 2009. Check the license (California A115007, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Collin Thomas Zimmerman
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- A115007 CA
106937 MN
57153 MN
Self-reported in NPPES; status is on the state search - Practice location
- 4647 Zion Ave, San Diego, CA 92120
- Phone
- (619) 528-5713
- Enumerated
- Jul 24, 2009
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120810000146); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2009
- 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 4647 Zion Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Samy Abdou, MDNeurological Surgery Physician1215085006
- Samvel Abelyan, PHARMDPharmacist1306629928
- Ali Aboutaleb, MDFamily Medicine Physician1821261405
- Patricia Achilly, CNMAdvanced Practice Midwife1932257847
- Linda Adams, PAPhysician Assistant1427174689
- Mette-Margrethe Adkisson, M.D.Emergency Medicine Physician1528288081
Verify Collin Thomas Zimmerman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A115007Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average hematology & oncology physician in 2024
1,987 Medicare Part D claims for 316 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 268 claims were for opioids.
Most prescribed
- Lenalidomide185 claims
- Ondansetron Odt148 claims
- Hydrocodone-Acetaminophen119 claims
- Dexamethasone94 claims
- Acyclovir88 claims
- Oxycodone Hcl88 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
- Southern California Permanente Medical GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Collin Thomas Zimmerman among 1,583 hematology & oncology physician records in California
Collin Thomas Zimmerman, 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 2009, is newer than 66% of them.
- NPI issued2009 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2009 · median 2003 among the 1,124 with a school on file
- Record last updated2021 · 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 San Diego → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Jenny Devitt, MDSan Diego, CA 921201134296098
- Scott Godfrey, DOSan Diego, CA 921201659464089
- Charles Kossman, M.D.San Diego, CA 921201184799892
- Steven Kossman, M.D.San Diego, CA 921201477628634
- Nina Liu, MDSan Diego, CA 921201801944756
- Stephanie OssowskiSan Diego, CA 921201417301482
- John Oval, MDSan Diego, CA 921201720136617
- Dean Peng, MDSan Diego, CA 921201235298811
Common questions
What is Collin Thomas Zimmerman, MD's NPI number?
Collin Thomas Zimmerman, MD's National Provider Identifier (NPI) is 1396975256, issued on Jul 24, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Collin Thomas Zimmerman, MD located?
The NPPES record lists a practice address at 4647 Zion Ave, San Diego, CA, 92120. Phone: (619) 528-5713. Providers update this record themselves, so call before visiting.
How can I verify Collin Thomas Zimmerman, MD's license?
NPPES lists California license number A115007, 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 Collin Thomas Zimmerman, MD prescribe under Medicare Part D?
In 2024, Collin Thomas Zimmerman, MD had 1,987 Medicare Part D claims for 316 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.