Thora C. Mark, NP-C
Family Nurse Practitioner · Dededo, GU
Thora C. Mark, NP-C is a family nurse practitioner with a practice address in Dededo, Guam, and NPI 1336658889, issued on Sep 28, 2017. Check the license (Guam NP0169, as entered in NPPES) with the Guam board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Thora C. Mark
- Credential
- NP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License numbers
- NP0169 GU
RX0487 GU
Self-reported in NPPES; status is on the state search - Practice location
- 520 W Santa Monica Ave, Dededo, GU 96929
- Phone
- (671) 635-7400
- Enumerated
- Sep 28, 2017
- Record last updated
- Feb 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190225002314); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 33 in Guam → Look up another NPI →
Also registered at 520 W Santa Monica Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Meagan Bamba-Ada, FNP-CFamily Nurse Practitioner1568874345
- Teofila Maria Cruz, MSN, APRN, FNP-CNurse Practitioner1548500291
- James Finch, NPAdvanced Practice Midwife1467643767
- Lean Carlo Losinio, CNMAdvanced Practice Midwife1497386353
- April Karen Marquez, DO, MPHPediatrics Physician1265927305
- Maureen Tang, FNP-BCFamily Nurse Practitioner1689321044
Verify Thora C. Mark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Guam board licenses this profession
Search for license NP0169Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family nurse practitioner in 2024
58 Medicare Part D claims, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Metoprolol Tartrate11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- General Conference Corp OF SdaTamuning, GU
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thora C. Mark among 33 family nurse practitioner records in Guam
Thora C. Mark, NP-C is one of 33 family nurse practitioner records with a practice address in Guam. 52% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 27% of them.
- NPI issued2017 · 27% of these records are older, 64% newer
- In a Medicare fileYes · 52% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated2015 · median 2017 among the 15 with a school on file
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Guam practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 family nurse practitioner records list a practice address in Dededo
They are 7 of the 139 NPPES records with a practice address in Dededo, and 33 family nurse practitioner records in Guam.
All 33 in Guam → Every provider in Dededo → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Victoria Ballares, FNP-BCDededo, GU 969291245725167
- Meagan Bamba-Ada, FNP-CDededo, GU 969291568874345
- Andrew Blakley, FNP-BCDededo, GU 969291992288989
- Lilia LynchDededo, GU 969291912475872
- Maureen Tang, FNP-BCDededo, GU 969291689321044
- Erika Vargas, FNPDededo, GU 969291992416952
- Suzanne Lobaton, DNP, APRN, FNP-BCHagatna, GU 969321033092317
- Kevin Hitosis, MSN, APRN, BCAgana Heights, GU 969191255385340
Common questions
What is Thora C. Mark, NP-C's NPI number?
Thora C. Mark, NP-C's National Provider Identifier (NPI) is 1336658889, issued on Sep 28, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Thora C. Mark, NP-C located?
The NPPES record lists a practice address at 520 W Santa Monica Ave, Dededo, GU, 96929. Phone: (671) 635-7400. Providers update this record themselves, so call before visiting.
How can I verify Thora C. Mark, NP-C's license?
NPPES lists Guam license number NP0169, as entered by the provider. Search the Guam board that licenses this profession; the NPPES record confirms identity only.
How much does Thora C. Mark, NP-C prescribe under Medicare Part D?
In 2024, Thora C. Mark, NP-C had 58 Medicare Part D claims; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.