Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joan Joonsun Ryoo, MD, MSHS

Therapeutic Radiology Physician in Los Angeles, CA · enumerated 2006 · practices at Kaiser Permanente Los Angeles.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1699854596

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Registry record

Entity type Individual (Type 1)

Name Dr. Joan Joonsun Ryoo

Credential MD, MSHS

Sex Female

Practice address 4950 W Sunset Blvd, Second Floor, Los Angeles, CA, 90027

Phone (323) 783-2841

Enumeration date Nov 3, 2006

Last updated in NPPES Dec 1, 2021

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 221442 (MA) Secondary

2085R0203X Therapeutic Radiology Physician Allopathic & Osteopathic Physicians · License A98329 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Joan Ryoo?

Joan Ryoo is registered in NPPES with the primary taxonomy of Therapeutic Radiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-01.