Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark M. Yun, MD

Q: What is the NPI number for Mark Yun?

The National Provider Identifier (NPI) for Mark Yun is 1326538687, a Type 1 (individual) record in the CMS NPPES registry.

Rheumatology Physician in Sturbridge, MA · enumerated 2018 · practices at Electra Health Medical Mass PC.

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

National Provider Identifier

1326538687

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark M. Yun

Credential MD

Sex Male

Practice address 198 Charlton Rd, Sturbridge, MA, 01566

Phone (508) 765-7878

Enumeration date May 12, 2018

Last updated in NPPES Oct 3, 2023

Taxonomy & licenses

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 1015976 (MA) 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

Where does Mark Yun practice?

The practice location on file with NPPES is in Sturbridge, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mark Yun?

The National Provider Identifier (NPI) for Mark Yun is 1326538687, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-03.