Ruwan Gunaratne, MD
NPI 1538664461 · Hematology & Oncology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ruwan Gunaratne, MD is a Hematology & Oncology Physician provider in Stanford, CA (NPI 1538664461).
Provider details
- NPI number
- 1538664461
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A163648 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
8 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-03-23
- Last updated
- 2026-01-27
- Certified
- 2026-01-27
Frequently asked questions
- What is Ruwan Gunaratne's NPI number?
- Ruwan Gunaratne's National Provider Identifier (NPI) is 1538664461, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ruwan Gunaratne's specialty?
- Ruwan Gunaratne is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ruwan Gunaratne located?
- Ruwan Gunaratne's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Ruwan Gunaratne's phone number?
- The practice phone number listed in the NPPES registry for Ruwan Gunaratne is (650) 723-4000.
- Does Ruwan Gunaratne accept Medicare?
- Ruwan Gunaratne is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ruwan Gunaratne's NPI active?
- Yes — Ruwan Gunaratne's NPI (1538664461) is active in the NPPES registry as of the last update on 2026-01-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.