John J. Orrego, MD
Endocrinology, Diabetes & Metabolism Physician · Denver, CO
John J. Orrego, MD is an endocrinology, diabetes & metabolism physician with a practice address in Denver, Colorado, and NPI 1891822839, issued on Feb 27, 2007. Check the license (Colorado 41916, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- John J. Orrego
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 41916 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1375 E 20TH Ave, Denver, CO 80205
- Phone
- (303) 338-4545
- Enumerated
- Feb 27, 2007
- Record last updated
- Jun 14, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 01136062 CO
- Medicare enrollment
- Enrolled (PECOS I20110211000316); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 149 in Colorado → Look up another NPI →
Also registered at 1375 E 20TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer Allen-Thomas, REGISTERED NURSERegistered Nurse1841327814
- Mana Amir, MDPulmonary Disease Physician1598731994
- Barbara Anderson, NPNurse Practitioner1962617076
- Sheri AndrusRegistered Nurse1750418638
- Sharisse Arnold Rehring, M.D.Pediatrics Physician1083741045
- Tyler Ashford, RNRegistered Nurse1568903383
Verify John J. Orrego in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 41916Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,888 Medicare Part D claims for 475 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims.
Most prescribed
- Levothyroxine Sodium472 claims
- Methimazole235 claims
- Forteo231 claims
- Ozempic155 claims
- Insulin Glargine-Yfgn140 claims
- Testosterone118 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.
Bills Medicare through one group practice
- Colorado Permanente Medical Group PCLone Tree, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John J. Orrego among 149 endocrinology, diabetes & metabolism physician records in Colorado
John J. Orrego, MD is one of 149 endocrinology, diabetes & metabolism physician records with a practice address in Colorado. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 51% of them.
- NPI issued2007 · 51% of these records are older, 31% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1989 · median 2002 among the 106 with a school on file
- Record last updated2021 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Colorado
There are 149 endocrinology, diabetes & metabolism physician records in Colorado.
All 149 in Colorado → Every provider in Denver → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Shari Fox, MDDenver, CO 802051588750822
- William Georgitis, MDDenver, CO 802051447387485
- Mary JenningsDenver, CO 802051649307604
- Joshua Klopper, M.D.Denver, CO 802051952322141
- Katherine Weber, MDDenver, CO 802051770613523
- Daniel Bessesen, MDDenver, CO 802041447262506
- Karin Hickey, MDDenver, CO 802061649591645
- Tejaswi Kompala, MDDenver, CO 802061235558255
Common questions
What is John J. Orrego, MD's NPI number?
John J. Orrego, MD's National Provider Identifier (NPI) is 1891822839, issued on Feb 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John J. Orrego, MD located?
The NPPES record lists a practice address at 1375 E 20TH Ave, Denver, CO, 80205. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify John J. Orrego, MD's license?
NPPES lists Colorado license number 41916, 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 John J. Orrego, MD prescribe under Medicare Part D?
In 2024, John J. Orrego, MD had 2,888 Medicare Part D claims for 475 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.