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

Dr. Adam Zachary Tillowitz, MD

Gastroenterology Physician in Washington, DC · enumerated 2020.

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

National Provider Identifier

1245869510

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Registry record

Entity type Individual (Type 1)

Name Dr. Adam Zachary Tillowitz

Credential MD

Sex Male

Practice address Washington, DC, 20037

Phone (202) 741-3000

Enumeration date Apr 7, 2020

Last updated in NPPES May 18, 2026

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

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License MD21210 (RI) 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 Adam Tillowitz?

The National Provider Identifier (NPI) for Adam Tillowitz is 1245869510, a Type 1 (individual) record in the CMS NPPES registry.

Where does Adam Tillowitz practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-18.