Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Margaret Mary Brewinski Isaacs, M.D., MPH

Public Health & General Preventive Medicine Physician in Silver Spring, MD · enumerated 2006.

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

National Provider Identifier

1801812201

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Registry record

Entity type Individual (Type 1)

Name Dr. Margaret Mary Brewinski Isaacs

Credential M.D., MPH

Sex Female

Practice address 10903 New Hampshire Ave, Silver Spring, MD, 20993

Phone (888) 463-6332

Enumeration date Jul 15, 2006

Last updated in NPPES Apr 19, 2026

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License D0064549 (MD) Secondary

2083P0901X Public Health & General Preventive Medicine Physician Allopathic & Osteopathic Physicians · License D64549 (MD) 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

Where does Margaret Brewinski Isaacs practice?

The practice location on file with NPPES is in Silver Spring, MD. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Margaret Brewinski Isaacs?

The National Provider Identifier (NPI) for Margaret Brewinski Isaacs is 1801812201, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-04-19.