Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark W Grier, MD
Pediatrics Physician in Austin, TX · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1407862758
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Registry record
Entity type Individual (Type 1)
Name Mark W Grier
Credential MD
Sex Male
Practice address 1301 S, Capital of Texas Hwy, Building A Ste.230, Austin, TX, 78746
Phone (512) 328-7666
Fax (572) 276-2939
Enumeration date Jul 31, 2006
Last updated in NPPES Mar 24, 2026
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 179323403 | Medicaid | TX | - |
| 179323404 | Medicaid | TX | - |
| 179323405 | Medicaid | TX | - |
| 179323401 | Medicaid | TX | - |
| 179323402 | 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
What specialty is Mark Grier?
Mark Grier is registered in NPPES with the primary taxonomy of Pediatrics Physician. 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.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-03-24.