Gregory Nielsen
NPI 1851910087 · Psychiatry Physician · Highlands Ranch, CO
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Nielsen is a Psychiatry Physician provider in Highlands Ranch, CO (NPI 1851910087).
Provider details
- NPI number
- 1851910087
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-04-08
- Last updated
- 2024-08-15
- Certified
- 2024-08-15
Frequently asked questions
- What is Gregory Nielsen's NPI number?
- Gregory Nielsen's National Provider Identifier (NPI) is 1851910087, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Nielsen's specialty?
- Gregory Nielsen is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Nielsen located?
- Gregory Nielsen's practice location on file with NPPES is 9285 Hepburn St, Highlands Ranch, CO 80129-2262.
- What is Gregory Nielsen's phone number?
- The practice phone number listed in the NPPES registry for Gregory Nielsen is (303) 338-4545.
- Does Gregory Nielsen accept Medicare?
- Gregory Nielsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Nielsen's NPI active?
- Yes — Gregory Nielsen's NPI (1851910087) is active in the NPPES registry as of the last update on 2024-08-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.