Silvia Alonzo, MS, PA-C
- 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
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Providence Medical Foundation
Diamond Bar, California
Find Silvia Alonzo's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
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
- 1942586623NPI Registry (opens in a new tab)
- 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
- Get email
- Mobile number
- Get number
- 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 Foundation1514 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.
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.
| Site | EHR vendor and product |
|---|---|
| Providence Medical Foundation | Available with a free account |
| +3 more sites and 1 medical group | Available 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, CaliforniaPrimary
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.
Silvia Alonzo's Medicare services by type, 2024
- Office and hospital visits183
- Other services24
- 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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Medicare shows one payer. Book a meeting to get commercial claims data for Silvia Alonzo and other physician assistants in California.
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.
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
- High cholesterol72%
- High blood pressure59%
- Arthritis41%
- Anxiety21%
- Diabetes21%
- Chronic kidney disease18%
- Depression17%
- 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.
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.
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.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Silvia Alonzo is board certified in certified physician assistant
- Board certified in certified physician assistant
Source: Dmand AI Professional Profile Data
Sources for Silvia Alonzo's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand 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.
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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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