Duane Claassen, M.D.
Family Medicine Physician · Golden, CO
Duane Claassen, M.D. is a family medicine physician with a practice address in Golden, Colorado, and NPI 1497759880, issued on Jun 13, 2005. Check the license (Colorado 25366, as entered in NPPES) on the Colorado Medical Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Duane Claassen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 25366 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1707 Cole Blvd, Golden, CO 80401
- Phone
- (303) 233-8295
- Enumerated
- Jun 13, 2005
- Record last updated
- Jul 20, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (303) 233-8443
- Medicaid ID
- 01253665 CO
- Entity
- Type 1 · individual
Also registered at 1707 Cole Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ernest Castro, MDFamily Medicine Physician1982785721
- Benjamin Greller, MDInternal Medicine Physician1891829545
- Carrie Hildebrandt, RXN,NPAdult Psychiatric/Mental Health Clinical Nurse Specialist1427102052
- Julie HsuPhysician Assistant1417065244
- Arti Karna, MDInternal Medicine Physician1326158627
- Sally Quick, PAPhysician Assistant1730113077
Verify Duane Claassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 25366Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41 family medicine physician records list a practice address in Golden
They are 41 of the 1,371 NPPES records with a practice address in Golden, and 3,563 family medicine physician records in Colorado. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 41 in Golden → All 3,563 in Colorado → Every provider in Golden →
Other family medicine physician records in Colorado
- Eric Abbott, D.O.Colorado Springs, CO1255522876
- John Abbott, D.O.Lamar, CO1255477790
- Rasha Abdelsalam, MDDenver, CO1891058467
- Baiju Abdulla, M.B.B.S.Colorado Springs, CO1316119076
- Nathalie Abisror, MDCastle Pines, CO1336634922
- Ashley Abrahamson, DOPueblo, CO1497324065
- Lara Abrahamson, MDFort Collins, CO1538145289
- Pamela Abrams, MDBroomfield, CO1073514188
- Hemamalini Achuthan, MDLakewood, CO1205982881
- Chris Adams, D.O.Limon, CO1144285248
Common questions
What is Duane Claassen, M.D.'s NPI number?
Duane Claassen, M.D.'s National Provider Identifier (NPI) is 1497759880, issued on Jun 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Duane Claassen, M.D. located?
The NPPES record lists a practice address at 1707 Cole Blvd, Golden, CO, 80401. Phone: (303) 233-8295. Providers update this record themselves, so call before visiting.
How can I verify Duane Claassen, M.D.'s license?
NPPES lists Colorado license number 25366, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.