Quick answers
- Does Garabed P. Nishanian accept Medicare assignment?
- Yes. Medicare's clinician data says Garabed P. Nishanian 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 Garabed P. Nishanian see?
- In 2024, CMS data shows 741 Original Medicare patients and 1,573 services for Garabed P. Nishanian. This counts Original Medicare only and measures volume, not quality.
- What is Garabed P. Nishanian's NPI number?
- 1336297290. 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 Garabed P. Nishanian, 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 | 741 |
|---|---|
| Services billed to Medicare | 1,573 |
| Different services or procedures | 72 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Ultrasound study of arm or leg veins with compression and maneuvers (93970)316 services
- Ultrasound of both sides of head and neck blood flow (93880)196 services
- Ultrasound study of one arm or leg veins with compression and maneuvers (93971)152 services
- Injection of chemical agent into multiple incompetent veins of same leg using ultrasound guidance (36466)113 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)87 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 blood pressure75%
- High cholesterol75%
- Arthritis57%
- Ischemic heart disease43%
- Chronic kidney disease38%
- Diabetes35%
Hospitals where Garabed P. Nishanian works
Medicare's Facility Affiliation Data lists Garabed P. Nishanian at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224
- Hoag Orthopedic InstituteIrvine, CA · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 050769
Practice locations
Addresses where Garabed P. Nishanian is enrolled with Medicare (CMS data updated October 2, 2026).
- 16100 Sand Canyon Ave, Suite 350Irvine, CA 92618 (949) 429‑8840
Specialties
- Vascular Surgeryprimary
Other vascular surgeons in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tulane University School Of Medicine |
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336297290 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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