Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Alfred Martin Derrow, MD

Internal Medicine Physician in Dix Hills, NY · enumerated 2009.

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

National Provider Identifier

1134457765

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Registry record

Entity type Individual (Type 1)

Name Dr. Alfred Martin Derrow

Credential MD

Sex Male

Practice address Dix Hills, NY, 11746

Phone (631) 499-8892

Enumeration date Nov 19, 2009

Last updated in NPPES Nov 19, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 091043 (NY) 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 Alfred Derrow practice?

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

What is the NPI number for Alfred Derrow?

The National Provider Identifier (NPI) for Alfred Derrow is 1134457765, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-11-19.