Quick answers
- Does Hovsep G. Mahdessian accept Medicare assignment?
- Yes. Medicare's clinician data says Hovsep G. Mahdessian 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 Hovsep G. Mahdessian see?
- In 2024, CMS data shows 137 Original Medicare patients and 2,700 services for Hovsep G. Mahdessian. This counts Original Medicare only and measures volume, not quality.
- What is Hovsep G. Mahdessian's NPI number?
- 1659544203. 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 Hovsep G. Mahdessian, 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 | 137 |
|---|---|
| Services billed to Medicare | 2,700 |
| Different services or procedures | 63 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)77 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)58 services
- Automated urinalysis test (81003)19 services
- Blood test, basic group of blood chemicals (calcium, total) (80048)18 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)17 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%
- Arthritis69%
- Diabetes53%
- Ischemic heart disease45%
- Depression39%
Practice locations
Addresses where Hovsep G. Mahdessian is enrolled with Medicare (CMS data updated October 2, 2026).
- 1543 E Palmdale BlvdPalmdale, CA 93550
- 43839 15th St WLancaster, CA 93534 (661) 945‑5984
Group practices
Medicare enrollment lists Hovsep G. Mahdessian as a member of these groups (CMS data updated October 2, 2026).
- High Desert Medical Corporation54 clinicians in the group
- Roy Medical Group Inc4 clinicians in the group
Specialties
- Internal Medicineprimary
- Family Practicealso
Other internal medicine doctors in Palmdale
Clinicians with the same Medicare primary specialty in Palmdale, CA — not a recommendation.
Other clinicians in High Desert Medical Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2000 (26 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659544203 |
| 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