Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Joyce Sun, CRNP

Adult Medicine Physician in Rockville, MD · enumerated 2015 · practices at Professional Services of Holy Cross.

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

National Provider Identifier

1932588662

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Registry record

Entity type Individual (Type 1)

Name Joyce Sun

Credential CRNP

Sex Female

Practice address Rockville, MD, 20850

Phone (240) 426-0130

Enumeration date May 27, 2015

Last updated in NPPES Oct 2, 2021

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207QA0505X Adult Medicine Physician Allopathic & Osteopathic Physicians · License R175445 (MD) Primary

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 Joyce Sun?

Joyce Sun is registered in NPPES with the primary taxonomy of Adult Medicine 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 2021-10-02.