Maurine C. Onat, MD
Internal Medicine Physician · Denver, CO
Maurine C. Onat, MD is an internal medicine physician with a practice address in Denver, Colorado, and NPI 1225129232, issued on Sep 27, 2006. Check the license (Colorado CO21802, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Maurine C. Onat
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- CO21802 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1501 S Gaylord St, Denver, CO 80210
- Phone
- (303) 722-9875
- Enumerated
- Sep 27, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (303) 698-9619
- Medicaid ID
- 01218023 CO
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 1501 S Gaylord St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Maurine C. Onat in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license CO21802Check 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 internal medicine physician in 2024
27 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% 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.
Maurine C. Onat among 2,046 internal medicine physician records in Colorado
Maurine C. Onat, MD is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
493 internal medicine physician records list a practice address in Denver
They are 493 of the 25,068 NPPES records with a practice address in Denver, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Denver → Internal Medicine Physician nationwide →
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Common questions
What is Maurine C. Onat, MD's NPI number?
Maurine C. Onat, MD's National Provider Identifier (NPI) is 1225129232, issued on Sep 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maurine C. Onat, MD located?
The NPPES record lists a practice address at 1501 S Gaylord St, Denver, CO, 80210. Phone: (303) 722-9875. Providers update this record themselves, so call before visiting.
How can I verify Maurine C. Onat, MD's license?
NPPES lists Colorado license number CO21802, 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 Maurine C. Onat, MD prescribe under Medicare Part D?
In 2024, Maurine C. Onat, MD had 27 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.