Catherine A. Mascarenas, MS, FNP-C
Nurse Practitioner · Littleton, CO
Catherine A. Mascarenas, MS, FNP-C is a nurse practitioner with a practice address in Littleton, Colorado, and NPI 1043347065, issued on Feb 27, 2007. Check the license (Colorado 118557, as entered in NPPES) with the Colorado board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Catherine A. Mascarenas
- Credential
- MS, FNP-C
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 118557 CO
Self-reported in NPPES; status is on the state search - Practice location
- 7175 W Fremont PL, Littleton, CO 80128
- Phone
- (303) 518-1030
- Enumerated
- Feb 27, 2007
- Record last updated
- Sep 9, 2025
- Medicaid ID
- 44130881 CO
- Medicare enrollment
- Enrolled (PECOS I20081028000153); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 1,260 in Colorado → Look up another NPI →
Verify Catherine A. Mascarenas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this profession
Search for license 118557Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.5 times the Medicare Part D claims of the average nurse practitioner in 2024
6,105 Medicare Part D claims for 223 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 115 claims were for opioids.
Most prescribed
- Levothyroxine Sodium317 claims
- Atorvastatin Calcium262 claims
- Lisinopril225 claims
- Furosemide206 claims
- Omeprazole190 claims
- Amlodipine Besylate171 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
- Physician Housecalls LLCLakewood, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine A. Mascarenas among 1,260 nurse practitioner records in Colorado
Catherine A. Mascarenas, MS, FNP-C is one of 1,260 nurse practitioner records with a practice address in Colorado. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 19% of them.
- NPI issued2007 · 19% of these records are older, 67% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2002 · median 2018 among the 662 with a school on file
- Record last updated2025 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nurse Practitioner providers in Colorado
There are 1,260 nurse practitioner records in Colorado.
All 1,260 in Colorado → Every provider in Littleton → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Sarah Wierda, FNPLittleton, CO 801281316439052
- Addisalem Workneh, FNPLittleton, CO 801281730025446
- Sara Buros, FNPLittleton, CO 801271558641837
- Nicole Chia, NP-CHighlands Ranch, CO 801291700645918
- April Clark, CNPLittleton, CO 801271194746545
- Drew Dawkins, NPHighlands Ranch, CO 801291952741340
- Steven GinsburgHighlands Ranch, CO 801291952892101
- Courtney Greenup, NURSE PRACTITIONERHighlands Ranch, CO 801291184277394
Common questions
What is Catherine A. Mascarenas, MS, FNP-C's NPI number?
Catherine A. Mascarenas, MS, FNP-C's National Provider Identifier (NPI) is 1043347065, issued on Feb 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Catherine A. Mascarenas, MS, FNP-C located?
The NPPES record lists a practice address at 7175 W Fremont PL, Littleton, CO, 80128. Phone: (303) 518-1030. Providers update this record themselves, so call before visiting.
How can I verify Catherine A. Mascarenas, MS, FNP-C's license?
NPPES lists Colorado license number 118557, as entered by the provider. Search the Colorado board that licenses this profession; the NPPES record confirms identity only.
How much does Catherine A. Mascarenas, MS, FNP-C prescribe under Medicare Part D?
In 2024, Catherine A. Mascarenas, MS, FNP-C had 6,105 Medicare Part D claims for 223 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.