Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Thora C. Mark, NP-C

Family Nurse Practitioner in Dededo, GU · enumerated 2017.

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

National Provider Identifier

1336658889

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Registry record

Entity type Individual (Type 1)

Name Ms. Thora C. Mark

Credential NP-C

Sex Female

Practice address 520 W Santa Monica Ave, Dededo, GU, 96929

Phone (671) 635-7400

Enumeration date Sep 28, 2017

Last updated in NPPES Feb 16, 2021

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License RX0487 (GU) Secondary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License NP0169 (GU) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1336658889 active?

Yes, as of the latest NPPES snapshot, NPI 1336658889 is active (record last updated 2021-02-16).

How do I verify Thora Mark's NPI record?

Cross-check NPI 1336658889 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

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Government of Guam Department of Administration Federally Qualified Health Center (FQHC) · Dededo, GU NPI 1972577104 Dept. of Public Health Pharmacy-Nrchc State or Local Public Health Clinic/Center · Dededo, GU NPI 1760532394 Department of Public Health and Social Services Public Health or Welfare Agency · Dededo, GU NPI 1740471028 Department of Public Health and Social Services Public Health or Welfare Agency · Dededo, GU NPI 1659562932 James Finch Advanced Practice Midwife · Dededo, GU NPI 1467643767 Teofila Maria Cruz Nurse Practitioner · Dededo, GU NPI 1548500291 Meagan Bamba-Ada Family Nurse Practitioner · Dededo, GU NPI 1568874345 April Karen Marquez Pediatrics Physician · Dededo, GU NPI 1265927305

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-16.