Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Lydia Andrea Breen, MD
Psychiatry Physician in Chicago, IL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1518926203
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Lydia Andrea Breen
Credential MD
Sex Female
Practice address 211 E Ontario St, Suite #1195, Chicago, IL, 60611
Phone (773) 381-3421
Fax (312) 988-9363
Enumeration date Mar 21, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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 |
|---|---|---|---|
| 1633712 | Other | IL | BLUE CROSS BLUE SHIELD |
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.
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 Lydia Breen?
Lydia Breen is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → John Bailitz Emergency Medicine Physician · Chicago, IL NPI 1710988654 Theodore Koutouzis Emergency Medicine Physician · Chicago, IL NPI 1891773321 Benjamin Lumicao Cardiovascular Disease Physician · Chicago, IL NPI 1225096647 Michael Raida Psychiatry Physician · Chicago, IL NPI 1518910389 Leonel Urdaneta Internal Medicine Physician · Chicago, IL NPI 1073541660 Neurometriks Ltd Neurology Physician · Chicago, IL NPI 1003839465 Jean O'Mahoney Clinical Psychologist · Chicago, IL NPI 1144233529 Ethan Meisel General Practice Physician · Chicago, IL NPI 1013029511
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.