Michael Difronzo
NPI 1881095107 · Physician Assistant · Colton, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Difronzo is a Physician Assistant provider in Colton, CA (NPI 1881095107).
Provider details
- NPI number
- 1881095107
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
217 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 78 | $117 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 61 | $150 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 35 | $83 |
| Automated Urinalysis Test81003 | 26 | $2 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 17 | $101 |
Typical Medicare-allowed amounts for these services range $2–$150 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methylprednisolone | 75 | 73 |
| Naproxen | 38 | 37 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 31 | 28 |
| Fluticasone Propionate | 22 | 21 |
| Ciprofloxacin Hcl | 17 | 16 |
| Cephalexin | 16 | 15 |
| Azithromycin | 14 | 13 |
| Ibuprofen | 13 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-09-05
- Last updated
- 2016-04-13
Frequently asked questions
- What is Michael Difronzo's NPI number?
- Michael Difronzo's National Provider Identifier (NPI) is 1881095107, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Difronzo's specialty?
- Michael Difronzo is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Michael Difronzo located?
- Michael Difronzo's practice location on file with NPPES is 400 N Pepper Ave, Colton, CA 92324-1801.
- What is Michael Difronzo's phone number?
- The practice phone number listed in the NPPES registry for Michael Difronzo is (909) 580-1000.
- Does Michael Difronzo accept Medicare?
- Michael Difronzo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Difronzo's NPI active?
- Yes — Michael Difronzo's NPI (1881095107) is active in the NPPES registry as of the last update on 2016-04-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.