Silvia Alonzo, MS, PA-C

  • Diamond Bar, CA
  • Physician assistant
NPI1942586623PAC ID2365683240
Medicare services, 2024
221
Medicare patients, 2024
145
Part D claims, 2024
2,771
Hospital affiliations
1
Industry payments
$188
Practice address
1514 Valley Vista Dr, Diamond Bar, CA 91765
Practice phone
Call (714) 449-4900
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Providence Medical Foundation

Diamond Bar, California

See all 6 affiliations

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Silvia Alonzo is a physician assistant in Diamond Bar, California

Silvia Alonzo practices at Providence Medical Foundation in Diamond Bar, California.

Silvia Alonzo's NPI, 1942586623, was assigned on October 26, 2011. Silvia Alonzo holds California license PA21842.

NPI and contact details
Medicare PAC ID
2365683240
NPI enumeration date
October 26, 2011
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(714) 449-4900
Professional email
Get email
Personal email
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Mobile number
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Sex
Female
Estimated age
41
Medical school graduation
2011

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)

Silvia Alonzo practices at Providence Medical Foundation in Diamond Bar, California

Silvia Alonzo's primary practice is Providence Medical Foundation, at 1514 Valley Vista Dr, Diamond Bar, CA 91765 in Los Angeles County. The practice phone is (714) 449-4900.

  • Providence Medical Foundation
    1514 Valley Vista Dr, Diamond Bar, CA 91765 · Los Angeles CountyPhone(714) 449-4900

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Silvia Alonzo is affiliated with 4 sites of care and 2 medical groups

Silvia Alonzo's primary practice is Providence Medical Foundation in Diamond Bar, California. Silvia Alonzo is also affiliated with Providence St. Jude Medical Center. The medical group on file is St. Jude Heritage Medical Group. Dmand AI also links Silvia Alonzo to 1 more group practice or clinic, 1 home health agency and 1 medical group, each named with a free account.

See all 6 affiliations for Silvia Alonzo

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data

Dmand AI tracks the EHR system at Silvia Alonzo's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Silvia Alonzo practices, 3 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Providence Medical FoundationAvailable with a free account
+3 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Silvia Alonzo is one of 2,381 physician assistants in California

Medical is Silvia Alonzo's primary specialty in the NPI Registry, under taxonomy code 363AM0700X. Silvia Alonzo is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA). Silvia Alonzo is licensed in California.

Specialties and state licenses

  • Medical physician assistant, CaliforniaPrimaryLicense PA21842 · taxonomy 363AM0700X

Clinical focus

Dmand AI lists acute sinusitis, acute skin infection, alzheimer's disease, anxiety, arthritis, chronic kidney disease, chronic obstructive pulmonary disease (COPD) and contact dermatitis among the conditions Silvia Alonzo treats.

Physician assistants near Silvia Alonzo

Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Silvia Alonzo billed Medicare for 221 services in 2024

CMS data shows 221 Medicare services from Silvia Alonzo across 4 procedure codes in 2024, for 145 Medicare patients. Medicare paid $16,212 for them. Every service was in an office.

Medicare services, 2024221
Medicare patients145
Paid by Medicare$16,212
Procedure codes4

Silvia Alonzo's Medicare services by type, 2024

  1. Office and hospital visits183
  2. Other services24
  3. Tests and treatments14

Silvia Alonzo compared with the California median for physician assistants, 2024

  • Silvia Alonzo
  • California median
Medicare services
221vs 27821% below
Medicare patients
145vs 11625% above
Part D claims
2,206vs 4405.0 times

Medians across 1,473 physician assistants in California with Dmand AI profiles that report each measure.

Silvia Alonzo's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Silvia Alonzo treated 145 Medicare patients in 2024, average age 74

CMS counts 145 Medicare patients who saw Silvia Alonzo in 2024. The largest group is 65 to 74, with 79 patients. 72% of them have high cholesterol, and 59% have high blood pressure. Their average risk score is 1.02, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Silvia Alonzo's median patient age at 64, with 72% women.

Medicare patients, 2024145
Average age74
Average risk score1.02

Silvia Alonzo's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Silvia Alonzo's Medicare patients by sex, 2024

  • Women10572%
  • Men4028%

Chronic conditions among Silvia Alonzo's Medicare patients, 2024

  1. High cholesterol72%
  2. High blood pressure59%
  3. Arthritis41%
  4. Anxiety21%
  5. Diabetes21%
  6. Chronic kidney disease18%
  7. Depression17%
  8. Mood disorders17%

Share of Medicare patients with each condition. A patient can have several.

Silvia Alonzo's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 64

Patient panel by sex, all payers

  • Women72%
  • Men27%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Silvia Alonzo wrote 2,771 Medicare Part D claims in 2024

In 2024, Silvia Alonzo wrote 2,771 Medicare Part D claims for 495 patients. 88% of them were for generic drugs. CMS names the drug for 2,206 of them, across 65 drugs with 11 or more claims each, at $125,087 in total drug cost.

Part D claims, 20242,771
Drugs named by CMS65
Total drug cost$125,087
Part D patients495

Silvia Alonzo's Part D claims by kind of drug, 2024

  • Generic2,438 claims88%
  • Brand-name306 claims11%
  • Other27 claims1%

Silvia Alonzo's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in Silvia Alonzo's Part D claims, 2024

  • Opioids1%24 of 2,771 claims
  • Antibiotics4%111 of 2,771 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

See all prescribing by Silvia Alonzo

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Silvia Alonzo offers telehealth to Medicare patients

Silvia Alonzo accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Silvia Alonzo as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Source: Doctors and Clinicians National Downloadable File (CMS)

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Silvia Alonzo received $188 in industry payments from 2024 to 2025

CMS Open Payments shows 9 general payments to Silvia Alonzo from 6 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $49.

General payments to Silvia Alonzo by program year, 2024 to 2025

Companies that paid Silvia Alonzo the most, 2024 to 2025

Share is of all general payments to this clinician.

See all payments to Silvia Alonzo

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Silvia Alonzo is board certified in certified physician assistant

  1. Board certified in certified physician assistantNational Commission on Certification of Physician Assistants (NCCPA)

Source: Dmand AI Professional Profile Data

Sources for Silvia Alonzo's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Silvia Alonzo

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Silvia Alonzo's NPI number?

Silvia Alonzo's NPI number is 1942586623. It was assigned on October 26, 2011, and it is active in the NPI Registry.

What does Silvia Alonzo specialize in?

Silvia Alonzo is a physician assistant in Diamond Bar, California. The primary specialty in the NPI Registry is Medical Physician Assistant (taxonomy code 363AM0700X).

Where does Silvia Alonzo practice?

Silvia Alonzo practices at 1514 Valley Vista Dr, Diamond Bar, CA 91765. Silvia Alonzo's primary practice is Providence Medical Foundation in Diamond Bar, California. Dmand AI also links Silvia Alonzo to 1 group practice or clinic, 1 home health agency and 1 medical group.

What is Silvia Alonzo's office phone number?

The practice phone on file for Silvia Alonzo is (714) 449-4900.

What is Silvia Alonzo's medical license number?

Silvia Alonzo holds California license PA21842.

Which hospitals is Silvia Alonzo affiliated with?

Silvia Alonzo is affiliated with Providence St. Jude Medical Center.

What medical group is Silvia Alonzo part of?

Silvia Alonzo is linked to St. Jude Heritage Medical Group. Dmand AI links Silvia Alonzo to 1 more medical group.

Does Silvia Alonzo accept Medicare?

Yes. CMS data shows Silvia Alonzo billed Medicare for 221 services in 2024, and Silvia Alonzo accepts Medicare assignment.

Does Silvia Alonzo offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Silvia Alonzo as offering telehealth services.

How many Medicare patients does Silvia Alonzo see?

CMS counts 145 Medicare patients who saw Silvia Alonzo in 2024, with an average age of 74.

Show 5 more questionsShow fewer questions

Is Silvia Alonzo board certified?

Yes. Silvia Alonzo is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA).

What services does Silvia Alonzo bill to Medicare?

In 2024, Silvia Alonzo's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and medicare service (G0439).

What drugs does Silvia Alonzo prescribe most?

In 2024 Medicare Part D data, Silvia Alonzo's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Losartan Potassium.

Has Silvia Alonzo received payments from drug or device companies?

CMS Open Payments shows $188 in general payments to Silvia Alonzo from 6 companies from 2024 to 2025. The largest total came from GlaxoSmithKline, LLC.

How long has Silvia Alonzo been practicing?

Silvia Alonzo graduated from medical school in 2011, 15 years ago.

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