Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Katharine Fast, M.D.

Allergy & Immunology Physician in San Francisco, CA · enumerated 2007.

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

National Provider Identifier

1275720484

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Registry record

Entity type Individual (Type 1)

Name Dr. Katharine Fast

Credential M.D.

Sex Female

Practice address 450 Sutter St, Allergy and Immunology Suite 1336, San Francisco, CA, 94108

Phone (415) 433-7800

Fax (415) 433-2130

Enumeration date Oct 2, 2007

Last updated in NPPES Jan 18, 2012

Taxonomy & licenses

207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License A92138 (CA) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A92138 (CA) Secondary

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

How do I verify Katharine Fast's NPI record?

Cross-check NPI 1275720484 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1275720484 active?

Yes, as of the latest NPPES snapshot, NPI 1275720484 is active (record last updated 2012-01-18).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-01-18.