Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Marianna Bilis, O.D.
Optometrist in Chicago, IL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1912976044
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Registry record
Entity type Individual (Type 1)
Name Marianna Bilis
Credential O.D.
Sex Female
Practice address 3500 W Peterson Ave, Suite 401, Chicago, IL, 60659
Phone (773) 588-3090
Fax (773) 588-3210
Enumeration date Mar 14, 2006
Last updated in NPPES Mar 30, 2017
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 046008924 | Medicaid | IL | - |
| P00210269 | Other | IL | RAILROAD MEDICARE |
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
What specialty is Marianna Bilis?
Marianna Bilis is registered in NPPES with the primary taxonomy of Optometrist. 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.
Other providers at this practice address
Browse all → Jennifer Bulmann Optometrist · Chicago, IL NPI 1811980964 Charles Ovitsky Optometrist · Chicago, IL NPI 1821049693 Charles Ovitsky Optometrist · Chicago, IL NPI 1558313189 Lawrence Magee Optometrist · Chicago, IL NPI 1982777306 Ralph Gebert Optometrist · Chicago, IL NPI 1720151152 Howard L Blivaiss DDS and Associates PC Dental Clinic/Center · Chicago, IL NPI 1154481182 Howard Blivaiss General Practice Dentistry · Chicago, IL NPI 1922168954 Julie Bruce Optometrist · Chicago, IL NPI 1144419847
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-03-30.