Aaron J. Calderon, MD
Internal Medicine Physician · Denver, CO
Aaron J. Calderon, MD is an internal medicine physician with a practice address in Denver, Colorado, and NPI 1124075353, issued on May 31, 2006. Check the license (Colorado 40910, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Aaron J. Calderon
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 40910 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1960 Ogden St Ste 400, Denver, CO 80218
- Phone
- (303) 318-1540
- Enumerated
- May 31, 2006
- Record last updated
- Jul 21, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (303) 318-2481
- Medicaid ID
- 53188268 CO
- Medicare enrollment
- Enrolled (PECOS I20040628000160); accepts Medicare assignment
- Medical or professional school
- State University Of Ny Upstate Medical University, 1993
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 1960 Ogden St Ste 400
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Aaron J. Calderon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 40910Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Uptown Community Health Center IncDenver, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Aaron J. Calderon among 2,046 internal medicine physician records in Colorado
Aaron J. Calderon, 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 fileYes · 53% of these records are
- Graduated1993 · median 2006 among the 1,090 with a school on file
- Record last updated2011 · 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 →
The 8 internal medicine physician records with the nearest ZIP codes
- August Anneberg, M.D.Denver, CO 802181225000508
- Samuel Brown, MDDenver, CO 802181245206515
- Nicola Bugelli, MDDenver, CO 802181760460695
- Alan Burgess, MDDenver, CO 802181003804931
- Stephen Carmel, MDDenver, CO 802181245260017
- Elizabeth Cyran, MD, MSPHDenver, CO 802181184662108
- Brian Dwinnell, M.D.Denver, CO 802181992725964
- Thomas Jenkins, MDDenver, CO 802181598706731
Common questions
What is Aaron J. Calderon, MD's NPI number?
Aaron J. Calderon, MD's National Provider Identifier (NPI) is 1124075353, issued on May 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Aaron J. Calderon, MD located?
The NPPES record lists a practice address at 1960 Ogden St Ste 400, Denver, CO, 80218. Phone: (303) 318-1540. Providers update this record themselves, so call before visiting.
How can I verify Aaron J. Calderon, MD's license?
NPPES lists Colorado license number 40910, 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. 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.