Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Greenstein, CO
Orthotist in Spring, TX · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1497179899
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Registry record
Entity type Individual (Type 1)
Name Mark Greenstein
Credential CO
Sex Male
Practice address 230 Spring Hill Dr, Suite 335, Spring, TX, 77386
Phone (281) 296-8999
Enumeration date Feb 6, 2014
Last updated in NPPES Feb 6, 2014
Taxonomy & licenses
222Z00000X Orthotist Respiratory, Developmental, Rehabilitative and Restorative Service Providers Primary
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 Mark Greenstein?
Mark Greenstein is registered in NPPES with the primary taxonomy of Orthotist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Julie Diener Physical Therapist · Spring, TX NPI 1558526640 Rebecca Thorley Speech-Language Pathologist · Spring, TX NPI 1336395938 Betty Crofton Speech-Language Pathologist · Spring, TX NPI 1003063850 Spencer Smith Prosthetist · Spring, TX NPI 1891058004 David Patterson Orthotist · Spring, TX NPI 1841649167
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-02-06.