Harold E. Quan
Cardiovascular Disease Physician · Newhall, CA
Harold E. Quan is a cardiovascular disease physician with a practice address in Newhall, California, and NPI 1033220256, issued on Aug 31, 2006. Check the license (California A34182, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Harold E. Quan
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A34182 CA
Self-reported in NPPES; status is on the state search - Practice location
- 23928 Lyons Ave, Newhall, CA 91321
- Phone
- (661) 255-8321
- Enumerated
- Aug 31, 2006
- Record last updated
- Feb 3, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (661) 255-0338
- Medicaid ID
- 00A341820 CA
- Medicare enrollment
- Enrolled (PECOS I20090210000331); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 23928 Lyons Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Steven Baron, MD PHDEndocrinology, Diabetes & Metabolism Physician1194886119
- Felix BarteCardiovascular Disease Physician1922119148
- Wendy Clough, M.D.Infectious Disease Physician1225077175
- Michael Jean, MDGastroenterology Physician1033163985
- Floyd Katske, M.D.Urology Physician1346340809
- Rajinder Kaushal, M.D.Gastroenterology Physician1285706259
Verify Harold E. Quan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A34182Check 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% more Medicare Part D claims than the average cardiovascular disease physician in 2024
3,895 Medicare Part D claims for 293 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. 28 claims were for opioids.
Most prescribed
- Amlodipine Besylate375 claims
- Rosuvastatin Calcium337 claims
- Atorvastatin Calcium317 claims
- Metoprolol Succinate253 claims
- Eliquis172 claims
- Metoprolol Tartrate145 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 MIPS final score for 2023 (Medicare payment program): 20.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $596.19
8 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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.
Harold E. Quan among 2,574 cardiovascular disease physician records in California
Harold E. Quan 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 45% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1972 · median 1999 among the 1,742 with a school on file
- Record last updated2014 · 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 Newhall → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Felix BarteNewhall, CA 913211922119148
- Hans Gao, MDThousand Oaks, CA 913201538663919
- Michael Papanicolaou, M.D.Thousand Oaks, CA 913201922038967
- Christopher Purmer, M.D.Thousand Oaks, CA 913201124058169
- Scott Wasserman, MDNewbury Park, CA 913201528405818
- Zouheir Elias, MDNorthridge, CA 913251962460501
- Richard Pego, MDNorthridge, CA 913251073627022
- Jahandar Saleh, M.D.Northridge, CA 913251861526451
Common questions
What is Harold E. Quan's NPI number?
Harold E. Quan's National Provider Identifier (NPI) is 1033220256, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Harold E. Quan located?
The NPPES record lists a practice address at 23928 Lyons Ave, Newhall, CA, 91321. Phone: (661) 255-8321. Providers update this record themselves, so call before visiting.
How can I verify Harold E. Quan's license?
NPPES lists California license number A34182, 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 Harold E. Quan prescribe under Medicare Part D?
In 2024, Harold E. Quan had 3,895 Medicare Part D claims for 293 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
What is Harold E. Quan's MIPS final score?
The 2023 MIPS final score is 20.7 of 100. 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.