DR. HOVSEP GHEVONT MAHDESSIAN MD
NPI 1659544203
Internal Medicine in Palmdale, CA
About Dr. Hovsep Ghevont Mahdessian Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. HOVSEP GHEVONT MAHDESSIAN MD (NPI 1659544203) is an individual internal medicine provider in Palmdale, California, licensed in California (A102305) and active in the NPI registry since April 2008. He is enrolled in Medicare PECOS and is a graduate of Other (2000).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Hovsep Ghevont Mahdessian Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Hovsep Mahdessian reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Lancaster, CA 93534
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: High Desert Medical Corporation
- 81 clinicians in this Medicare group
North Hollywood, CA 91606
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
North Hollywood, CA 91606
- Reassigned Medicare billing, California enrollment
- 5 clinicians in this Medicare group
West Hills, CA 91304
- Reassigned Medicare billing, California enrollment
- 205 clinicians in this Medicare group
Canoga Park, CA 91303
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 93550 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Hovsep Mahdessian's NPI number?
The NPI number for Hovsep Mahdessian is 1659544203. It was assigned to this individual provider in the NPPES registry on April 3, 2008.
Where is Hovsep Mahdessian located?
Hovsep Mahdessian practices at 327 E Palmdale Blvd, Palmdale, CA 93550. The listed phone number is (661) 273-5888.
What is Hovsep Mahdessian's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Hovsep Mahdessian enrolled in Medicare?
Yes. Hovsep Mahdessian is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Hovsep Mahdessian's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Hovsep Mahdessian reassigns Medicare benefits to 5 organizations: High Desert Medical Group (Lancaster, CA), And Inc (North Hollywood, CA), Noalab Clinic Inc. (North Hollywood, CA), Lakeside Medical Organization, A Medical Group Inc. (West Hills, CA) and Roy Medical Group, Inc. (Canoga Park, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Hovsep Mahdessian's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Hovsep Mahdessian was last updated on November 23, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Hovsep Ghevont Mahdessian, MD · NPI 1659544203
Internal Medicine physician in Palmdale, California. Individual provider, active in the CMS NPPES registry since April 3, 2008.
## Identity
- **NPI:** 1659544203 (Entity type: Individual)
- **Enumerated:** April 3, 2008
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A102305 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 327 E PALMDALE BLVD, Palmdale, CA 93550-7139
- **Phone:** (661) 273-5888
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): High Desert Medical Group (NPI 1720196702, Lancaster, CA); And Inc (NPI 1447657648, North Hollywood, CA); Noalab Clinic Inc. (NPI 1649805508, North Hollywood, CA); Lakeside Medical Organization, A Medical Group Inc. (NPI 1831426642, West Hills, CA); Roy Medical Group, Inc. (NPI 1801921952, Canoga Park, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2000
## Record status
- **NPPES last updated:** November 23, 2011
---
Source: [NPI Profile](https://npiprofile.com/npi/1659544203) · Data from the CMS NPPES public registry.