Diane Irvine Duncan, M.D.
Specialist · Fort Collins, CO
Diane Irvine Duncan, M.D. is a specialist with a practice address in Fort Collins, Colorado, and NPI 1003822065, issued on Jul 31, 2006. Check the license (Colorado 28327, as entered in NPPES) with the Colorado board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Diane Irvine Duncan
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 28327 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1701 E Prospect RD, Fort Collins, CO 80525
- Phone
- (970) 493-7445
- Enumerated
- Jul 31, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (970) 493-1775
- Medicaid ID
- 01283274 CO
- Entity
- Type 1 · individual
8 nearest specialist records → All 1,105 in Colorado → Look up another NPI →
Verify Diane Irvine Duncan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this profession
Search for license 28327Check 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 specialist in 2024
71 Medicare Part D claims for 21 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 17 claims were for opioids.
Most prescribed
- Cephalexin17 claims
- Ondansetron Hcl16 claims
- Hydrocodone-Acetaminophen14 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.
Industry payments in 2024: $97.94
3 payments; by number, the most common kind was food and beverage; the largest payer was Revance Therapeutics, Inc. The 5,844 providers of this specialty with any payment received $4,760.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Diane Irvine Duncan among 1,105 specialist records in Colorado
Diane Irvine Duncan, M.D. is one of 1,105 specialist records with a practice address in Colorado. 12% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 76% newer
- In a Medicare fileYes · 12% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2007 · 89% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
86 specialist records list a practice address in Fort Collins
They are 86 of the 6,928 NPPES records with a practice address in Fort Collins, and 1,105 specialist records in Colorado.
All 1,105 in Colorado → Every provider in Fort Collins → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Hilda Deines, CMTFort Collins, CO 805251750402483
- Jane Houck, CMTFort Collins, CO 805251386775666
- Larry Kieft, MDFort Collins, CO 805251184627218
- Anastasios Kolovos, CMTFort Collins, CO 805251912027962
- Rebecca McClanahan, CMTFort Collins, CO 805251720119985
- Michael Murray, CMTFort Collins, CO 805251265559512
- Twyla OslerFort Collins, CO 805251306976147
- Jason Rosin, CMTFort Collins, CO 805251083745699
Common questions
What is Diane Irvine Duncan, M.D.'s NPI number?
Diane Irvine Duncan, M.D.'s National Provider Identifier (NPI) is 1003822065, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Diane Irvine Duncan, M.D. located?
The NPPES record lists a practice address at 1701 E Prospect RD, Fort Collins, CO, 80525. Phone: (970) 493-7445. Providers update this record themselves, so call before visiting.
How can I verify Diane Irvine Duncan, M.D.'s license?
NPPES lists Colorado license number 28327, as entered by the provider. Search the Colorado board that licenses this profession; the NPPES record confirms identity only.
How much does Diane Irvine Duncan, M.D. prescribe under Medicare Part D?
In 2024, Diane Irvine Duncan, M.D. had 71 Medicare Part D claims for 21 beneficiaries; the average among specialist prescribers was 1,380. 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.