Ruwan Gunaratne, MD
Hematology & Oncology Physician · Stanford, CA
Ruwan Gunaratne, MD is a hematology & oncology physician with a practice address in Stanford, California, and NPI 1538664461, issued on Mar 23, 2018. Check the license (California A163648, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ruwan Gunaratne
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A163648 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Mar 23, 2018
- Record last updated
- Jan 27, 2026
- Medicare enrollment
- Enrolled (PECOS I20260121000566); may accept Medicare assignment
- Medical or professional school
- Duke University School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
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Verify Ruwan Gunaratne in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A163648Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
13 Medicare Part D claims, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D.
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.
Ruwan Gunaratne among 1,583 hematology & oncology physician records in California
Ruwan Gunaratne, 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 2018, is newer than 92% of them.
- NPI issued2018 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2018 · median 2003 among the 1,124 with a school on file
- Record last updated2026 · 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 Stanford → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Steven Artandi, M.D.Stanford, CA 943051548352909
- Linda Boxer, M.D.Stanford, CA 943051306938766
- Daniel Chen, MDStanford, CA 943051154457323
- Cheryl Cho-Phan, MDStanford, CA 943051508877929
- Gilbert Chu, MDStanford, CA 943051417083684
- George Fisher, MDStanford, CA 943051255446308
- Sandra Horning, M.D.Stanford, CA 943051578607669
- Harold Keer, MDStanford, CA 943051124154398
Common questions
What is Ruwan Gunaratne, MD's NPI number?
Ruwan Gunaratne, MD's National Provider Identifier (NPI) is 1538664461, issued on Mar 23, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Ruwan Gunaratne, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Ruwan Gunaratne, MD's license?
NPPES lists California license number A163648, 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 Ruwan Gunaratne, MD prescribe under Medicare Part D?
In 2024, Ruwan Gunaratne, MD had 13 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.