Michael Difronzo
Physician Assistant · Colton, CA
Michael Difronzo is a physician assistant with a practice address in Colton, California, and NPI 1881095107, issued on Sep 5, 2014. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Michael Difronzo
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 400 N Pepper Ave, Colton, CA 92324
- Phone
- (909) 580-1000
- Enumerated
- Sep 5, 2014
- Record last updated
- Apr 13, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150323002664); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 400 N Pepper Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Mohammad Hossein Abbasi, MD, MPHStudent in an Organized Health Care Education/Training Program1609622166
- Ala AbedrabboCertified Registered Nurse Anesthetist1972333144
- Mary AboagyeLicensed Vocational Nurse1982875605
Verify Michael Difronzo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average physician assistant in 2024
354 Medicare Part D claims for 238 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Methylprednisolone75 claims
- Naproxen38 claims
- Amoxicillin-Clavulanate Potass31 claims
- Fluticasone Propionate22 claims
- Ciprofloxacin Hcl17 claims
- Cephalexin16 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.
Bills Medicare through one group practice
- Carbon Health Medical Group OF California PCCerritos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Difronzo among 14,451 physician assistant records in California
Michael Difronzo is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 38% of them.
- NPI issued2014 · 38% of these records are older, 59% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2014 · median 2018 among the 7,214 with a school on file
- Record last updated2016 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
162 physician assistant records list a practice address in Colton
They are 162 of the 2,459 NPPES records with a practice address in Colton, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Colton → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Christine Bernier, P.A-CColton, CA 923241366482259
- Melissa Cornett, P.A-CColton, CA 923241154361905
- Maximillian Cruz, P.A-CColton, CA 923241538102751
- Joseph Florin, P.A-CColton, CA 923241427073162
- Lawrence Gates, P.A-CColton, CA 923241023059318
- Kristine Griffith, P.A-CColton, CA 923241174566707
- Anna Marie Lubatti, P.A-CColton, CA 923241598708661
- Thomas Manning, P.A-CColton, CA 923241538102009
Common questions
What is Michael Difronzo's NPI number?
Michael Difronzo's National Provider Identifier (NPI) is 1881095107, issued on Sep 5, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Michael Difronzo located?
The NPPES record lists a practice address at 400 N Pepper Ave, Colton, CA, 92324. Phone: (909) 580-1000. Providers update this record themselves, so call before visiting.
How can I verify Michael Difronzo's license?
Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Michael Difronzo prescribe under Medicare Part D?
In 2024, Michael Difronzo had 354 Medicare Part D claims for 238 beneficiaries; the average among physician assistant prescribers was 830. 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.