Quick answers
- Does Avedik H. Semerjian accept Medicare assignment?
- Yes. Medicare's clinician data says Avedik H. Semerjian 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 Avedik H. Semerjian see?
- In 2024, CMS data shows 389 Original Medicare patients and 1,684 services for Avedik H. Semerjian. This counts Original Medicare only and measures volume, not quality.
- What is Avedik H. Semerjian's NPI number?
- 1831120591. 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 Avedik H. Semerjian, 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 | 389 |
|---|---|
| Services billed to Medicare | 1,684 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)388 services
- Hemodialysis procedure with physician evaluation (90935)279 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)232 services
- Dialysis services, 4 or more physician visits per month (20 years or older) (90960)188 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)156 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%
- Chronic kidney disease75%
- Diabetes73%
- Heart failure55%
- Ischemic heart disease48%
Hospitals where Avedik H. Semerjian works
Medicare's Facility Affiliation Data lists Avedik H. Semerjian 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.
- Memorialcare Long Beach Medical CenterLong Beach, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050485
- PIH Health Downey HospitalDowney, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050393
- St Mary Medical CenterLong Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050191
- UCI Health-LakewoodLakewood, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050581
- UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348
Practice locations
Addresses where Avedik H. Semerjian is enrolled with Medicare (CMS data updated October 2, 2026).
- 11480 Brookshire Ave, Suite 110Downey, CA 90241 (562) 630‑3111
- 3300 E S St, Suite 308Lakewood, CA 90805 (562) 630‑3111
- 3300 E S St, Suite 308Long Beach, CA 90805
- 4152 Katella Ave, Suite 201Los Alamitos, CA 90720 (562) 630‑3111
Group practices
Medicare enrollment lists Avedik H. Semerjian as a member of this group (CMS data updated October 2, 2026).
- Southland Renal Medical Group Inc8 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Downey
Clinicians with the same Medicare primary specialty in Downey, CA — not a recommendation.
Other clinicians in Southland Renal Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1982 (44 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831120591 |
| 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