Mary K. Nguyen, M.D.
Family Medicine Physician · Parker, CO
Mary K. Nguyen, M.D. is a family medicine physician with a practice address in Parker, Colorado, and NPI 1386811362, issued on May 9, 2008. Check the license (Colorado DR.0065882, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mary K. Nguyen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- DR.0065882 CO
036122304 IL
Self-reported in NPPES; status is on the state search - Practice location
- 19964 Hilltop RD Ste A, Parker, CO 80134
- Phone
- (303) 841-2212
- Enumerated
- May 9, 2008
- Record last updated
- Jun 21, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210803000177); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Also registered at 19964 Hilltop RD Ste A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ian Bach, MDFamily Medicine Physician1003895293
- Kayleigh Belsey, PA-CPhysician Assistant1912416603
- Allison Kemp, PA-CPhysician Assistant1447788971
- Alesha KreutterPhysician Assistant1255990610
- Helen Markley, M.D.Family Medicine Physician1205076585
- Anna Miller, PA-CMedical Physician Assistant1477065548
Verify Mary K. Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0065882Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% fewer Medicare Part D claims than the average family medicine physician in 2024
3,192 Medicare Part D claims for 327 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 81 claims were for opioids.
Most prescribed
- Atorvastatin Calcium294 claims
- Levothyroxine Sodium162 claims
- Amlodipine Besylate99 claims
- Lisinopril95 claims
- Tamsulosin Hcl78 claims
- Rosuvastatin Calcium68 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
- Poudre Valley Medical Group LLCParker, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary K. Nguyen among 3,563 family medicine physician records in Colorado
Mary K. Nguyen, M.D. is one of 3,563 family medicine physician records with a practice address in Colorado. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 58% of them.
- NPI issued2008 · 58% of these records are older, 38% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2006 · median 2008 among the 2,077 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
61 family medicine physician records list a practice address in Parker
They are 61 of the 1,871 NPPES records with a practice address in Parker, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Parker → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Ian Bach, MDParker, CO 801341003895293
- Elizabeth Clark, D.O., MPH & TMParker, CO 801341134195993
- Charlie Dickman, MDParker, CO 801341205832433
- Patricia Fahey, M.D.Parker, CO 801341083655450
- Sivarama Guntur, MDParker, CO 801341003865676
- Lisa Ingram, M.D.Parker, CO 801341841217650
- John Morrison, M.D.Parker, CO 801341720049604
- Leto Quarles, M.D.Parker, CO 801341811917883
Common questions
What is Mary K. Nguyen, M.D.'s NPI number?
Mary K. Nguyen, M.D.'s National Provider Identifier (NPI) is 1386811362, issued on May 9, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mary K. Nguyen, M.D. located?
The NPPES record lists a practice address at 19964 Hilltop RD Ste A, Parker, CO, 80134. Phone: (303) 841-2212. Providers update this record themselves, so call before visiting.
How can I verify Mary K. Nguyen, M.D.'s license?
NPPES lists Colorado license number DR.0065882, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary K. Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Mary K. Nguyen, M.D. had 3,192 Medicare Part D claims for 327 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.