Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Douglas Fredrick Clark, O.D.
Optometrist in Austin, TX · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1336185628
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Registry record
Entity type Individual (Type 1)
Name Dr. Douglas Fredrick Clark
Credential O.D.
Sex Male
Practice address 5501 B North Ih 35, Austin, TX, 78723
Phone (512) 452-5735
Fax (512) 452-3119
Enumeration date Jun 22, 2006
Last updated in NPPES Jun 16, 2010
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 |
|---|---|---|---|
| 1335416-04 | Medicaid | TX | - |
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
How do I verify Douglas Clark's NPI record?
Cross-check NPI 1336185628 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1336185628 active?
Yes, as of the latest NPPES snapshot, NPI 1336185628 is active (record last updated 2010-06-16).
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-16.