Aaron Masayuki Tsumura, MD
Hematology & Oncology Physician · Sacramento, CA
Aaron Masayuki Tsumura, MD is a hematology & oncology physician with a practice address in Sacramento, California, and NPI 1982165213, issued on Mar 28, 2019. Check the license (California A180084, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Aaron Masayuki Tsumura
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A180084 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2279 45TH St, Sacramento, CA 95817
- Phone
- (167) 345-9599
- Enumerated
- Mar 28, 2019
- Record last updated
- Jun 21, 2024
- Medicare enrollment
- Enrolled (PECOS I20250919002134); accepts Medicare assignment
- 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 2279 45TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maria Alexis Agustin, RNPediatric Oncology Registered Nurse1649000316
- Kavya Babu, MDInternal Medicine Physician1922682392
- Niri CarrollGenetic Counselor (M.S.)1174017149
- Guadalupe Carvajal, LCGCGenetic Counselor (M.S.)1730880444
- John CawleyNurse Practitioner1164153540
- Deanna ChavezPediatric Registered Nurse1427888122
Verify Aaron Masayuki Tsumura in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A180084Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
245 Medicare Part D claims for 30 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Sprycel38 claims
- Gabapentin16 claims
- Prednisone15 claims
- Abiraterone Acetate14 claims
- Cyclobenzaprine Hcl13 claims
- Bupropion Hcl12 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).
Aaron Masayuki Tsumura among 1,583 hematology & oncology physician records in California
Aaron Masayuki Tsumura, 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 2019, is newer than 95% of them.
- NPI issued2019 · 95% of these records are older, 3% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2019 · median 2003 among the 1,124 with a school on file
- Record last updated2024 · 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 Sacramento → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Mehrad Abedi, M.D.Sacramento, CA 958171467459222
- Helen Chew, M.D.Sacramento, CA 958171801870142
- David Gandara, M.D.Sacramento, CA 958171528042587
- Richard Guy, M.D.Sacramento, CA 958171578545190
- Kit Lam, M.D., PH.D.Sacramento, CA 958171306829577
- Primo Lara, M.D.Sacramento, CA 958171972585743
- Derick Lau, M.D., PH.D.Sacramento, CA 958171801879077
- Robert O'Donnell, M.D., PH.D.Sacramento, CA 958171386627586
Common questions
What is Aaron Masayuki Tsumura, MD's NPI number?
Aaron Masayuki Tsumura, MD's National Provider Identifier (NPI) is 1982165213, issued on Mar 28, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Aaron Masayuki Tsumura, MD located?
The NPPES record lists a practice address at 2279 45TH St, Sacramento, CA, 95817. Phone: (167) 345-9599. Providers update this record themselves, so call before visiting.
How can I verify Aaron Masayuki Tsumura, MD's license?
NPPES lists California license number A180084, 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 Aaron Masayuki Tsumura, MD prescribe under Medicare Part D?
In 2024, Aaron Masayuki Tsumura, MD had 245 Medicare Part D claims for 30 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.