Eugene T. O'Neill, MD
Family Medicine Physician · Denver, CO
Eugene T. O'Neill, MD is a family medicine physician with a practice address in Denver, Colorado, and NPI 1598733917, issued on Mar 10, 2006. Check the license (Colorado 18395, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Eugene T. O'Neill
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 18395 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1738 S Washington St, Denver, CO 80210
- Phone
- (303) 808-6986
- Enumerated
- Mar 10, 2006
- Record last updated
- Dec 19, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (303) 997-9443
- Medicaid ID
- 01183953 CO
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Verify Eugene T. O'Neill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 18395Check 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% fewer Medicare Part D claims than the average family medicine physician in 2024
35 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 37% of 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.
Eugene T. O'Neill among 3,563 family medicine physician records in Colorado
Eugene T. O'Neill, 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 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 fileNo · 58% of these records are
- Record last updated2014 · 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).
457 family medicine physician records list a practice address in Denver
They are 457 of the 25,068 NPPES records with a practice address in Denver, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Denver → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Timothy Arnott, MDDenver, CO 802101053362673
- Tyler Brown, MDDenver, CO 802101154064806
- David Clampitt, MDDenver, CO 802101043430325
- Michael Dunn, M.D.Denver, CO 802101922155688
- Janice Hartman, M.DDenver, CO 802101821046723
- Ernesto Herfter, MDDenver, CO 802101659325710
- Brent Jaster, MDDenver, CO 802101740231398
- Elizabeth Kraft, MDDenver, CO 802101093581092
Common questions
What is Eugene T. O'Neill, MD's NPI number?
Eugene T. O'Neill, MD's National Provider Identifier (NPI) is 1598733917, issued on Mar 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Eugene T. O'Neill, MD located?
The NPPES record lists a practice address at 1738 S Washington St, Denver, CO, 80210. Phone: (303) 808-6986. Providers update this record themselves, so call before visiting.
How can I verify Eugene T. O'Neill, MD's license?
NPPES lists Colorado license number 18395, 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 Eugene T. O'Neill, MD prescribe under Medicare Part D?
In 2024, Eugene T. O'Neill, MD had 35 Medicare Part D claims; 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.