Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Denman Altgelt, DDS

Dentist in Kerrville, TX · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1124129457

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Mark Denman Altgelt

Credential DDS

Sex Male

Practice address 1001 North St, Kerrville, TX, 78028

Phone (830) 792-6626

Fax (830) 792-6670

Enumeration date Sep 26, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

122300000X Dentist Dental Providers · License 12532 (TX) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1124129457 active?

Yes, as of the latest NPPES snapshot, NPI 1124129457 is active (record last updated 2007-07-08).

How do I verify Mark Altgelt's NPI record?

Cross-check NPI 1124129457 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.