Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William R Chism, O.D.
Optometrist in Ozark, MO · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1639240955
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Registry record
Entity type Individual (Type 1)
Name William R Chism
Credential O.D.
Sex Male
Practice address 1000 W Jackson St, Ozark, MO, 65721
Phone (417) 581-5581
Fax (417) 581-5511
Enumeration date Nov 10, 2006
Last updated in NPPES Apr 30, 2012
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 |
|---|---|---|---|
| 4917230002 | Other | MO | DMERC REGION D |
| 310415237 | Medicaid | MO | - |
| 310415245 | Medicaid | MO | - |
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 NPI 1639240955 active?
Yes, as of the latest NPPES snapshot, NPI 1639240955 is active (record last updated 2012-04-30).
How do I verify William Chism's NPI record?
Cross-check NPI 1639240955 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-30.