Gregory Kimball Nielsen
Psychiatry Physician · Highlands Ranch, CO
Gregory Kimball Nielsen is a psychiatry physician with a practice address in Highlands Ranch, Colorado, and NPI 1851910087, issued on Apr 8, 2020. Check the license (Colorado DR.0073394, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Kimball Nielsen
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- DR.0073394 CO
Self-reported in NPPES; status is on the state search - Practice location
- 9285 Hepburn St, Highlands Ranch, CO 80129
- Phone
- (303) 338-4545
- Enumerated
- Apr 8, 2020
- Record last updated
- Aug 15, 2024
- Medicare enrollment
- Enrolled (PECOS I20240829001979); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 990 in Colorado → Look up another NPI →
Also registered at 9285 Hepburn St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Deborah AkinaLicensed Practical Nurse1417153800
- Fatya Amiri, DOFamily Medicine Physician1578191532
- Deborah BeasleyInternal Medicine Physician1144369547
- Wade Bennett, PAPhysician Assistant1639128192
- Melanie Bonin, M.D.Family Medicine Physician1497163265
- Sarah Boyer, MDFamily Medicine Physician1285761163
Verify Gregory Kimball Nielsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0073394Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average psychiatry physician in 2024
50 Medicare Part D claims for 29 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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
- Colorado Permanente Medical Group PCHighlands Ranch, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Kimball Nielsen among 990 psychiatry physician records in Colorado
Gregory Kimball Nielsen is one of 990 psychiatry physician records with a practice address in Colorado. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 91% of them.
- NPI issued2020 · 91% of these records are older, 5% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 35% of these records are
- Graduated2020 · median 2009 among the 351 with a school on file
- Record last updated2024 · 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 2084P0800X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
16 psychiatry physician records list a practice address in Highlands Ranch
They are 16 of the 1,361 NPPES records with a practice address in Highlands Ranch, and 990 psychiatry physician records in Colorado.
All 990 in Colorado → Every provider in Highlands Ranch → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Becky Estill, MDHighlands Ranch, CO 801291487781423
- Do Hyung Kim, DOHighlands Ranch, CO 801291134626633
- Alice Major, D.O.Highlands Ranch, CO 801291205185329
- Claire Nguyen, MDHighlands Ranch, CO 801291326676909
- Erin O'Flaherty, M.D.Highlands Ranch, CO 801291194040287
- Amie Owen, DOHighlands Ranch, CO 801291073187431
- Thomas Perry, MDHighlands Ranch, CO 801291598177651
- Mark Rhine, MDHighlands Ranch, CO 801291275660201
Common questions
What is Gregory Kimball Nielsen's NPI number?
Gregory Kimball Nielsen's National Provider Identifier (NPI) is 1851910087, issued on Apr 8, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Kimball Nielsen located?
The NPPES record lists a practice address at 9285 Hepburn St, Highlands Ranch, CO, 80129. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Gregory Kimball Nielsen's license?
NPPES lists Colorado license number DR.0073394, 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 Gregory Kimball Nielsen prescribe under Medicare Part D?
In 2024, Gregory Kimball Nielsen had 50 Medicare Part D claims for 29 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.