Paymon Mesgarzadeh, M.D.
Cardiovascular Disease Physician · Fontana, CA
Paymon Mesgarzadeh, M.D. is a cardiovascular disease physician with a practice address in Fontana, California, and NPI 1023216892, issued on Jul 3, 2007. Check the license (California A109433, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Paymon Mesgarzadeh
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A109433 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9985 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-5000
- Enumerated
- Jul 3, 2007
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110927000219); accepts Medicare assignment
- Medical or professional school
- Wayne State University School Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 9985 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Peyman Andalib, MDStudent in an Organized Health Care Education/Training Program1104028000
- Gerald ArafolOccupational Therapist1134315666
- Lovie Jay Arguelles, PTPhysical Therapist1457472920
Verify Paymon Mesgarzadeh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A109433Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
27% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
2,260 Medicare Part D claims for 493 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Bisoprolol Fumarate235 claims
- Pradaxa200 claims
- Amiodarone Hcl155 claims
- Carvedilol149 claims
- Dofetilide123 claims
- Furosemide92 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.
Industry payments in 2024: $17.37
1 payment: food and beverage; the largest payer was Abbott Laboratories. The 16,686 providers of this specialty with any payment received $3,819.56 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 one group practice
- Southern California Permanente Medical GroupOntario, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Paymon Mesgarzadeh among 2,574 cardiovascular disease physician records in California
Paymon Mesgarzadeh, M.D. is one of 2,574 cardiovascular disease physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 55% of them.
- NPI issued2007 · 55% of these records are older, 33% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2004 · median 1999 among the 1,742 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in California
There are 2,574 cardiovascular disease physician records in California.
All 2,574 in California → Every provider in Fontana → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Jasvir Ajit-Uppal, MDFontana, CA 923351811056575
- Jay Ball, MDFontana, CA 923351831260801
- David Chen, M.D.Fontana, CA 923351982634788
- William Chin, DOFontana, CA 923351508914490
- Eric Chou, MDFontana, CA 923351992876965
- Nainesh Gandhi, MDFontana, CA 923351003025743
- Eugene Hwang, MDFontana, CA 923351922156801
- Jennifer Knowles, MDFontana, CA 923351699846592
Common questions
What is Paymon Mesgarzadeh, M.D.'s NPI number?
Paymon Mesgarzadeh, M.D.'s National Provider Identifier (NPI) is 1023216892, issued on Jul 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Paymon Mesgarzadeh, M.D. located?
The NPPES record lists a practice address at 9985 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-5000. Providers update this record themselves, so call before visiting.
How can I verify Paymon Mesgarzadeh, M.D.'s license?
NPPES lists California license number A109433, 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 Paymon Mesgarzadeh, M.D. prescribe under Medicare Part D?
In 2024, Paymon Mesgarzadeh, M.D. had 2,260 Medicare Part D claims for 493 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
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.