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RUWAN GUNARATNE MD
NPI 1538664461
Internal Medicine - Hematology & Oncology in Stanford, CA

Active since March 23, 2018PECOS Enrolled
300 PASTEUR DR, STANFORD, CA 94305(650) 723-4000 Get Directions Write a Review

NPPES record last updated: January 27, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Jan 27, 2026, Mar 23, 2018 (2 updates tracked since 2018).

About Ruwan Gunaratne Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

RUWAN GUNARATNE MD (NPI 1538664461) is an individual hematology & oncology provider in Stanford, California, licensed in California (A163648) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS and is a graduate of Duke University School Of Medicine (2018).

NPPES Registry Identity

NPI1538664461
Entity TypeIndividualMale
Primary Taxonomy207RH0003X
Provider Legal NameRUWAN GUNARATNECredential: MD
Location Address300 PASTEUR DRStanford, CA 94305-2200
Mailing Address300 Pasteur DrStanford, CA 94305-2200 · (650) 723-4000
Phone(650) 723-4000
Sole ProprietorNo
Medical School CMSDuke University School Of MedicineGraduated 2018
Enumeration DateMarch 23, 2018
Last NPPES UpdateJanuary 27, 20262 updates tracked since enumeration
NPPES CertifiedJanuary 27, 2026
✔ NPI 1538664461 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 5

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
License✔ Licensed in CA · A163648
Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

Also ListedInternal MedicineTaxonomy 207R00000X · License A163648 (CA)
Also ListedInternal Medicine · HematologyTaxonomy 207RH0000X · License A163648 (CA)
Also ListedInternal Medicine · Medical OncologyTaxonomy 207RX0202X · License A163648 (CA)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
300 PASTEUR DR, Stanford, CA 94305
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ruwan Gunaratne Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7618454745
PECOS Enrollment IDI20260121000566
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94305 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$206.04 typical visit price
range $70.37 – $206.04
Typical copayment $51.51 (range $17.59 – $51.51)
Most-billed visit code 99205
Established Patient
$121.77 typical visit price
range $23.96 – $169.60
Typical copayment $30.44 (range $5.99 – $42.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. PRAVENE A NATH M.D.
Emergency Medicine
300 PASTEUR DR, H3200, M/C 5230
PALO ALTO, CA 94305
Santa Clara County (650) 721-6408
DR. DIANA G MC GREGOR MBBS
Anesthesiology
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-6411
DR. LISA MAI LEE MD
Obstetrics & Gynecology
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000
JING WANG CHIANG MD
Obstetrics & Gynecology
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000
DR. KEVIN LEE LETZ DNP, NP
Nurse Practitioner
300 PASTEUR DR, SUMC - PEDS PHYSICIAN BILLING MC:5530
PALO ALTO, CA 94305
Santa Clara County (650) 498-7391
DR. RHETT W. ATKINSON M.D.
Anesthesiology
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 725-6102
DR. MICHAEL WARREN CHAMPEAU M.D.
Anesthesiology
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 725-6102
DR. TERRI HOMER M.D.
Anesthesiology
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 725-6102

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ruwan Gunaratne's NPI number?

The NPI number for Ruwan Gunaratne is 1538664461. It was assigned to this individual provider in the NPPES registry on March 23, 2018.

Where is Ruwan Gunaratne located?

Ruwan Gunaratne practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.

What is Ruwan Gunaratne's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Ruwan Gunaratne enrolled in Medicare?

Yes. Ruwan Gunaratne is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Ruwan Gunaratne was last updated on January 27, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.