Guy P. Van Der Werf, MD
Family Medicine Physician · Estes Park, CO
Guy P. Van Der Werf, MD is a family medicine physician with a practice address in Estes Park, Colorado, and NPI 1538154257, issued on Sep 19, 2005. Check the license (Colorado 31317, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Guy P. Van Der Werf
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 31317 CO
Self-reported in NPPES; status is on the state search - Practice location
- 131 Stanley Ave Ste 202, Estes Park, CO 80517
- Phone
- (970) 586-2344
- Enumerated
- Sep 19, 2005
- Record last updated
- Sep 27, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (970) 586-9060
- Medicaid IDs
- 1313170 CO
01313170 CO - Medicare enrollment
- Enrolled (PECOS I20050525001019); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 1987
- 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 131 Stanley Ave Ste 202
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rebecca Sugar, LCSW, LACClinical Social Worker1194446534
- Eliska Webster, PA-CPhysician Assistant1144221029
Verify Guy P. Van Der Werf in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 31317Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% more Medicare Part D claims than the average family medicine physician in 2024
7,053 Medicare Part D claims for 675 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 320 claims were for opioids.
Most prescribed
- Lisinopril384 claims
- Levothyroxine Sodium325 claims
- Atorvastatin Calcium315 claims
- Tamsulosin Hcl309 claims
- Prednisone253 claims
- Amlodipine Besylate247 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 LLCEstes Park, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Guy P. Van Der Werf among 3,563 family medicine physician records in Colorado
Guy P. Van Der Werf, MD 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 88% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1987 · median 2008 among the 2,077 with a school on file
- Record last updated2018 · 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).
11 family medicine physician records list a practice address in Estes Park
They are 11 of the 128 NPPES records with a practice address in Estes Park, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Estes Park → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Paige Dekker, D.OEstes Park, CO 805171942733563
- Bridget Dunn, MDEstes Park, CO 805171063512655
- Hannah Fields, M.D.Estes Park, CO 805171568857662
- Paul Fonken, M.D.Estes Park, CO 805171831153345
- Amber Galey, MDEstes Park, CO 805171699185801
- Erika Norris, M.D.Estes Park, CO 805171851476485
- Bryan Reichert, MDEstes Park, CO 805171316174022
- John Stanton, D.O.Estes Park, CO 805171336152719
Common questions
What is Guy P. Van Der Werf, MD's NPI number?
Guy P. Van Der Werf, MD's National Provider Identifier (NPI) is 1538154257, issued on Sep 19, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Guy P. Van Der Werf, MD located?
The NPPES record lists a practice address at 131 Stanley Ave Ste 202, Estes Park, CO, 80517. Phone: (970) 586-2344. Providers update this record themselves, so call before visiting.
How can I verify Guy P. Van Der Werf, MD's license?
NPPES lists Colorado license number 31317, 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 Guy P. Van Der Werf, MD prescribe under Medicare Part D?
In 2024, Guy P. Van Der Werf, MD had 7,053 Medicare Part D claims for 675 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.