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

Catherine Stehman-Breen, MD

Nephrology Physician in York, ME · enumerated 2010.

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

National Provider Identifier

1174825707

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Registry record

Entity type Individual (Type 1)

Name Catherine Stehman-Breen

Credential MD

Sex Female

Practice address York, ME, 03909

Phone (207) 361-4566

Enumeration date Dec 2, 2010

Last updated in NPPES Mar 27, 2017

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

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License MD00030403 (CA) 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 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.

What specialty is Catherine Stehman-Breen?

Catherine Stehman-Breen is registered in NPPES with the primary taxonomy of Nephrology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-03-27.