Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mark R Zilm, OD
Optometrist in Glenwood Springs, CO · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1043204480
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Registry record
Entity type Individual (Type 1)
Name Dr. Mark R Zilm
Credential OD
Sex Male
Practice address 3122 Blake Ave, Glenwood Springs, CO, 81601
Phone (970) 945-2020
Fax (970) 945-5630
Enumeration date Aug 31, 2005
Last updated in NPPES Sep 9, 2011
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 |
|---|---|---|---|
| 08115008 | Medicaid | CO | - |
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 is the NPI number for Mark Zilm?
The National Provider Identifier (NPI) for Mark Zilm is 1043204480, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Zilm practice?
The practice location on file with NPPES is in Glenwood Springs, CO. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-09.