Hovsep Ghevont Mahdessian, MD
Internal Medicine Physician · Palmdale, CA
Hovsep Ghevont Mahdessian, MD is an internal medicine physician with a practice address in Palmdale, California, and NPI 1659544203, issued on Apr 3, 2008. Check the license (California A102305, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Hovsep Ghevont Mahdessian
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A102305 CA
O36.120147 IL
Self-reported in NPPES; status is on the state search - Practice location
- 327 E Palmdale Blvd, Palmdale, CA 93550
- Phone
- (661) 273-5888
- Enumerated
- Apr 3, 2008
- Record last updated
- Nov 23, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090610000584); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 327 E Palmdale Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Frederick Galloway, PAPhysician Assistant1073714960
- Luisa Pineda, M.D.General Practice Physician1215959648
Verify Hovsep Ghevont Mahdessian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A102305Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,505 Medicare Part D claims for 385 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Atorvastatin Calcium126 claims
- Methylprednisolone104 claims
- Metformin Hcl87 claims
- Amlodipine Besylate80 claims
- Omeprazole75 claims
- Gabapentin71 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 84 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $15.87
1 payment: food and beverage; the largest payer was Salix Pharmaceuticals, a division of Bausch Health US, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- High Desert Medical CorporationLancaster, CA
- Roy Medical Group IncPalmdale, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hovsep Ghevont Mahdessian among 17,696 internal medicine physician records in California
Hovsep Ghevont Mahdessian, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 56% of them.
- NPI issued2008 · 56% of these records are older, 40% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2000 · median 2004 among the 11,065 with a school on file
- Record last updated2011 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 internal medicine physician records list a practice address in Palmdale
They are 25 of the 2,077 NPPES records with a practice address in Palmdale, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Palmdale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Tin Aung, MDPalmdale, CA 935501578573572
- Lucjan Krzysiak, MDPalmdale, CA 935501326095373
- Khaing Myint, MDPalmdale, CA 935501518977511
- Gifty-Maria Ntim, M.D.Palmdale, CA 935501083894083
- Camellia Babaie, M.D.Palmdale, CA 935511902175441
- Joan Chapman, D.O.Palmdale, CA 935511225329733
- Wah Wah Chu, MDPalmdale, CA 935511891018719
- Pamela De Silva, MDPalmdale, CA 935511568414548
Common questions
What is Hovsep Ghevont Mahdessian, MD's NPI number?
Hovsep Ghevont Mahdessian, MD's National Provider Identifier (NPI) is 1659544203, issued on Apr 3, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Hovsep Ghevont Mahdessian, MD located?
The NPPES record lists a practice address at 327 E Palmdale Blvd, Palmdale, CA, 93550. Phone: (661) 273-5888. Providers update this record themselves, so call before visiting.
How can I verify Hovsep Ghevont Mahdessian, MD's license?
NPPES lists California license number A102305, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Hovsep Ghevont Mahdessian, MD prescribe under Medicare Part D?
In 2024, Hovsep Ghevont Mahdessian, MD had 2,505 Medicare Part D claims for 385 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Hovsep Ghevont Mahdessian, MD's MIPS final score?
The 2023 MIPS final score is 84 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.