Peter Barmon Brett, M.D.
Hematology & Oncology Physician · Santa Rosa, CA
Peter Barmon Brett, M.D. is a hematology & oncology physician with a practice address in Santa Rosa, California, and NPI 1487743472, issued on Oct 11, 2006. Check the license (California G59321, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Peter Barmon Brett
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- G59321 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3883 Airway Dr # 220, Santa Rosa, CA 95403
- Phone
- (707) 521-7750
- Enumerated
- Oct 11, 2006
- Record last updated
- Mar 7, 2023
- Medicaid ID
- 00G593210 CA
- Medicare enrollment
- Enrolled (PECOS I20190618002994); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 1985
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Verify Peter Barmon Brett in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G59321Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
24 Medicare Part D claims, against an average of 877 among the 10,784 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.
Bills Medicare through one group practice
- Commonwealth Healthcare CorporationSaipan, MP
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter Barmon Brett among 1,583 hematology & oncology physician records in California
Peter Barmon Brett, M.D. 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
- Graduated1985 · median 2003 among the 1,124 with a school on file
- Record last updated2023 · 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 Santa Rosa → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Nicolaj Andersen, MDSanta Rosa, CA 954031659455640
- Ian Anderson, M.D.Santa Rosa, CA 954031518055573
- Justin Grenet, MDSanta Rosa, CA 954031770102915
- Jarrod Holmes, MDSanta Rosa, CA 954031013018035
- Christine Kaiser, M.D.Santa Rosa, CA 954031023192267
- Zeyad Kanaan, M.D.Santa Rosa, CA 954031144412560
- Leroy Wayne Keiser, M.D.Santa Rosa, CA 954031417047283
- Yao Yao Pollock, MDSanta Rosa, CA 954031154692549
Common questions
What is Peter Barmon Brett, M.D.'s NPI number?
Peter Barmon Brett, M.D.'s National Provider Identifier (NPI) is 1487743472, issued on Oct 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter Barmon Brett, M.D. located?
The NPPES record lists a practice address at 3883 Airway Dr # 220, Santa Rosa, CA, 95403. Phone: (707) 521-7750. Providers update this record themselves, so call before visiting.
How can I verify Peter Barmon Brett, M.D.'s license?
NPPES lists California license number G59321, 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 Peter Barmon Brett, M.D. prescribe under Medicare Part D?
In 2024, Peter Barmon Brett, M.D. had 24 Medicare Part D claims; 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.