Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Douglas Dixon Clarke, D.O.

Endocrinology, Diabetes & Metabolism Physician in Hagerstown, MD · enumerated 2006 · practices at Medical Practices of Antietam LLC.

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

National Provider Identifier

1265407597

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Registry record

Entity type Individual (Type 1)

Name Dr. Douglas Dixon Clarke

Credential D.O.

Sex Male

Practice address 11110 Medical Campus Rd Ste 108, Hagerstown, MD, 21742

Phone (301) 714-4041

Fax (301) 714-4351

Enumeration date Feb 21, 2006

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License H83672 (MD) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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 Douglas Clarke practice?

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

What is the NPI number for Douglas Clarke?

The National Provider Identifier (NPI) for Douglas Clarke is 1265407597, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.