Preston Keith Nein, M.D.
Family Medicine Physician · Castle Rock, CO
Preston Keith Nein, M.D. is a family medicine physician with a practice address in Castle Rock, Colorado, and NPI 1194807404, issued on Oct 19, 2006. Check the license (Colorado 43279, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Preston Keith Nein
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 43279 CO
Self-reported in NPPES; status is on the state search - Practice location
- 3887 Stone Canon Ranch RD, Castle Rock, CO 80104
- Phone
- (303) 246-7027
- Enumerated
- Oct 19, 2006
- Record last updated
- May 4, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070614000382); accepts Medicare assignment
- Medical or professional school
- University Of Colorado School Of Medicine, Denver, 2003
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Verify Preston Keith Nein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 43279Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
64 Medicare Part D claims for 46 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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
- East Phillips County Hospital DistrictHolyoke, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Preston Keith Nein among 3,563 family medicine physician records in Colorado
Preston Keith Nein, 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 56% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2003 · 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).
45 family medicine physician records list a practice address in Castle Rock
They are 45 of the 1,319 NPPES records with a practice address in Castle Rock, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Castle Rock → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- John Campbell, M.D.Castle Rock, CO 801041053373415
- Christopher Carpenter, M.D.Castle Rock, CO 801041508846023
- Ann Engel, M.D.Castle Rock, CO 801041285743385
- Jack England, D.O.Castle Rock, CO 801041609856749
- Deborah Fromm, MDCastle Rock, CO 801041467492090
- Belton Hallmark, M.D.Castle Rock, CO 801041225018633
- Louis Kasunic, D.O.Castle Rock, CO 801041912083296
- Doris Kleinert, M.D.Castle Rock, CO 801041861474751
Common questions
What is Preston Keith Nein, M.D.'s NPI number?
Preston Keith Nein, M.D.'s National Provider Identifier (NPI) is 1194807404, issued on Oct 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Preston Keith Nein, M.D. located?
The NPPES record lists a practice address at 3887 Stone Canon Ranch RD, Castle Rock, CO, 80104. Phone: (303) 246-7027. Providers update this record themselves, so call before visiting.
How can I verify Preston Keith Nein, M.D.'s license?
NPPES lists Colorado license number 43279, 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 Preston Keith Nein, M.D. prescribe under Medicare Part D?
In 2024, Preston Keith Nein, M.D. had 64 Medicare Part D claims for 46 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.