Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Melissa Ryan, RN

Individual provider Hematology & Oncology Physician · NPI 1558230938

Melissa Ryan, RN is a Hematology & Oncology Physician in San Francisco, California. Licensed in California. Registered with an NPI since 2025.

Licensed in
CA
In the registry since
2025
What do these letters mean?
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.

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Practice location Address checks out

505 Parnassus Ave
San Francisco, CA 94143-2204
Phone: (415) 353-1383
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 689841 (CA)

Record details

NPI number1558230938
Entity typeIndividual (Type 1)
GenderFemale
Credentials RN
Sole proprietorNo
NPI enumeratedNovember 3, 2025
Last updated in NPPESNovember 3, 2025
Certification dateNovember 3, 2025

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