Quick answers
- Does Gregory Kouyoumdjian accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory Kouyoumdjian accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Gregory Kouyoumdjian see?
- In 2024, CMS data shows 299 Original Medicare patients and 859 services for Gregory Kouyoumdjian. This counts Original Medicare only and measures volume, not quality.
- What is Gregory Kouyoumdjian's NPI number?
- 1548219934. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gregory Kouyoumdjian, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 299 |
|---|---|
| Services billed to Medicare | 859 |
| Different services or procedures | 45 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Removal of cataract with insertion of prosthetic lens (66984)123 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)97 services
- Measurement of corneal curvature and depth of eye (92136)90 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)80 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)69 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol68%
- High blood pressure63%
- Arthritis50%
- Diabetes26%
- Ischemic heart disease23%
- Chronic kidney disease19%
Practice locations
Addresses where Gregory Kouyoumdjian is enrolled with Medicare (CMS data updated October 2, 2026).
- 10101 Ridgegate PkwyLone Tree, CO 80124 (720) 225‑1000
- 11961 Lioness WayParker, CO 80134 (303) 794‑1111
- 501 E Hamden AveEnglewood, CO 80113 (303) 788‑5000
- 8381 Southpark LnLittleton, CO 80120 (303) 991‑9662
Group practices
Medicare enrollment lists Gregory Kouyoumdjian as a member of these groups (CMS data updated October 2, 2026).
- Trauma and Emergency Subspecialty Surgeons PLLC27 clinicians in the group
- Glaucoma Consultants of Colorado PC8 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Lone Tree
Clinicians with the same Medicare primary specialty in Lone Tree, CO — not a recommendation.
Other clinicians in Trauma and Emergency Subspecialty Surgeons PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York University School Of Medicine |
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1548219934 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians