Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Constante J Tan, MD

Nephrology Physician in Salisbury, MD · enumerated 2005.

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

National Provider Identifier

1508848011

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Registry record

Entity type Individual (Type 1)

Name Constante J Tan

Credential MD

Sex Male

Practice address 1340 S Division St, Ste 301, Salisbury, MD, 21804

Phone (410) 546-4427

Fax (410) 546-2096

Enumeration date Nov 18, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License D0016725 (MD) 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.

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Frequently asked questions

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.

What specialty is Constante Tan?

Constante Tan is registered in NPPES with the primary taxonomy of Nephrology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Benito Chan Internal Medicine Physician · Salisbury, MD NPI 1306828488

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.