Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Nathaniel G Clark, MD

Endocrinology, Diabetes & Metabolism Physician in Hyannis, MA · enumerated 2006.

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

National Provider Identifier

1386687234

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Registry record

Entity type Individual (Type 1)

Name Dr. Nathaniel G Clark

Credential MD

Sex Male

Practice address 433 W Main St, Hyannis, MA, 02601

Phone (508) 778-4777

Fax (508) 771-9555

Enumeration date Jun 14, 2006

Last updated in NPPES Sep 27, 2012

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 72154 (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 is the NPI number for Nathaniel Clark?

The National Provider Identifier (NPI) for Nathaniel Clark is 1386687234, a Type 1 (individual) record in the CMS NPPES registry.

Where does Nathaniel Clark practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-27.