Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Oon Tian Tan, M.D

Dermatology Physician in Boston, MA · enumerated 2006.

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

National Provider Identifier

1992766596

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Oon Tian Tan

Credential M.D

Sex Female

Practice address 243 Charles Street, Boston, MA, 02114

Phone (617) 573-6493

Fax (617) 424-8428

Enumeration date Mar 31, 2006

Last updated in NPPES Oct 8, 2015

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 51655 (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

What specialty is Oon Tan?

Oon Tan is registered in NPPES with the primary taxonomy of Dermatology 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.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-10-08.