RUWAN GUNARATNE MD
NPI 1538664461
Internal Medicine - Hematology & Oncology in Stanford, CA
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
Specialties & Licenses 5
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Ruwan Gunaratne Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Ruwan Gunaratne reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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.
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.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Ruwan Gunaratne's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ruwan Gunaratne reassigns Medicare benefits to 2 organizations: Stanford Health Care (Stanford, CA) and Lpch Medical Group Div Of Lucile (Palo Alto, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ruwan Gunaratne's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Ruwan Gunaratne was last updated on January 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Ruwan Gunaratne, MD · NPI 1538664461
Hematology & Oncology physician in Stanford, California. Individual provider, active in the CMS NPPES registry since March 23, 2018.
## Identity
- **NPI:** 1538664461 (Entity type: Individual)
- **Enumerated:** March 23, 2018
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** A163648 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-4000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Duke University School Of Medicine, class of 2018
## Record status
- **NPPES last updated:** January 27, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1538664461) · Data from the CMS NPPES public registry.