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

Anna Butrymowicz

Otolaryngology Physician in San Francisco, CA · enumerated 2011.

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

National Provider Identifier

1740570944

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Registry record

Entity type Individual (Type 1)

Name Anna Butrymowicz

Sex Female

Practice address San Francisco, CA, 94115

Phone (415) 353-2757

Fax (415) 353-2603

Enumeration date Apr 10, 2011

Last updated in NPPES Mar 11, 2021

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

Taxonomy & licenses

207Y00000X Otolaryngology Physician Allopathic & Osteopathic Physicians · License A155938 (CA) Primary

207Y00000X Otolaryngology Physician Allopathic & Osteopathic Physicians · License 2281153 (NY) Secondary

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 specialty is Anna Butrymowicz?

Anna Butrymowicz is registered in NPPES with the primary taxonomy of Otolaryngology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-11.