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

Dr. Maria P Patterson, M.D.

Pediatric Ophthalmology and Strabismus Specialist Physician in Brookfield, WI · enumerated 2005 · practices at Maria Portellos Patterson, M.D., S.C..

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

National Provider Identifier

1790785731

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Registry record

Entity type Individual (Type 1)

Name Dr. Maria P Patterson

Credential M.D.

Sex Female

Practice address Brookfield, WI, 53005

Phone (262) 641-8181

Fax (262) 641-8188

Enumeration date Jul 29, 2005

Last updated in NPPES Feb 2, 2022

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

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 42757 (WI) Secondary

207WX0110X Pediatric Ophthalmology and Strabismus Specialist Physician Allopathic & Osteopathic Physicians · License 42757-20 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
34034800	Medicaid	WI	-

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.

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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 Maria Patterson?

Maria Patterson is registered in NPPES with the primary taxonomy of Pediatric Ophthalmology and Strabismus Specialist Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Maria Portellos Patterson, M.D., S.C. Specialist · Brookfield, WI NPI 1861516957

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-02-02.