Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mary A. Washington, MD, FACP

Nephrology Physician in Houston, TX · enumerated 2005.

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

National Provider Identifier

1811992894

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Registry record

Entity type Individual (Type 1)

Name Dr. Mary A. Washington

Credential MD, FACP

Sex Female

Practice address 1140 Westmont Dr, Suite 320, Houston, TX, 77015

Phone (713) 637-6320

Fax (713) 637-0735

Enumeration date Jun 16, 2005

Last updated in NPPES Aug 10, 2011

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License J0721 (TX) 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 Mary Washington?

The National Provider Identifier (NPI) for Mary Washington is 1811992894, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Washington practice?

The practice location on file with NPPES is in Houston, TX. 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 2011-08-10.