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

Dr. Grace Hou, M.D.

Surgical Oncology Physician in Tucson, AZ · enumerated 2006 · practices at Grace Hou MD PC.

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

National Provider Identifier

1801908181

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Registry record

Entity type Individual (Type 1)

Name Dr. Grace Hou

Credential M.D.

Sex Female

Practice address Tucson, AZ, 85741

Phone (520) 575-7159

Fax (520) 742-0260

Enumeration date Aug 31, 2006

Last updated in NPPES Aug 23, 2025

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

Taxonomy & licenses

2086X0206X Surgical Oncology Physician Allopathic & Osteopathic Physicians · License 22442 (AZ) 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

Is NPI 1801908181 active?

Yes, as of the latest NPPES snapshot, NPI 1801908181 is active (record last updated 2025-08-23).

How do I verify Grace Hou's NPI record?

Cross-check NPI 1801908181 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Grace Hou MD PC Surgical Oncology Physician · Tucson, AZ NPI 1336317221

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-23.