Phyllis Won , PA-C
Physician Assistant β’ San Rafael, CA
99 Montecillo Rd
San Rafael, CA 949033308
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on September 14, 2021; this date does not establish years in practice.
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Published CMS data list 28 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Clopidogrel (Clopidogrel Bisulfate) β 14 prescription fills, including refills.
- Pantoprazole Sodium β 14 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table Β· Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 95% of clinicians listed under Physician Assistant in San Rafael, CA (2024, 21 clinicians with data). Median for this group: 160. Middle half: 98 to 260.
Fewer Part D prescriptions than 85% of clinicians listed under Physician Assistant in California (2024, 7,539 clinicians with data). Median for this group: 228. Middle half: 72 to 717.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
Practice Location & Contact Primary Location
99 Montecillo Rd
San Rafael, CA 949033308
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
68 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$368 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $165.00 in 2023
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2023.
NPI first issued
2021
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Phyllis Won has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Phyllis Won as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in San Rafael and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 95% of clinicians listed under Physician Assistant in San Rafael, CA (2024, 21 clinicians with data). Median for this group: 160. Middle half: 98 to 260.
Fewer Part D prescriptions than 85% of clinicians listed under Physician Assistant in California (2024, 7,539 clinicians with data). Median for this group: 228. Middle half: 72 to 717.
Part D drug cost
A lower Part D drug cost than 95% of clinicians listed under Physician Assistant in San Rafael, CA (2024, 21 clinicians with data). Median for this group: $1,921. Middle half: $906 to $17,560.
A lower Part D drug cost than 80% of clinicians listed under Physician Assistant in California (2024, 7,539 clinicians with data). Median for this group: $3,933. Middle half: $709 to $60,211.
45 active clinicians are listed under Physician Assistant with a practice address in San Rafael, CA (14,754 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in San Rafael
11.1% of these 45 clinicians have the CMS telehealth indicator.
35.6% of these 45 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
CMS data for Part D prescriptions are available for 2024 only.
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30-day fills
CMS data for 30-day fills are available for 2024 only.
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Part D drug cost
CMS data for Part D drug cost are available for 2024 only.
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2023 only.
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2023), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2023 (payments made January 1 β December 31, 2023): fewer than 11 records totaling $165.00.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Inari Medical, Inc. |
Food and Beverage
In-kind items and services
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FLOWTRIEVER CATHETER, S | General | $165.00 |
Source: CMS Open Payments, program year 2023, released June 30, 2026.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Clopidogrel | Clopidogrel Bisulfate | 14 | 1,020 | $217.90 | 13 |
| Pantoprazole Sodium | Pantoprazole Sodium | 14 | 1,020 | $150.28 | 13 |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2023-05-02NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20230703002777
CA
3476912809
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Ophthalmology
Doctor of Medicine (M.D.)
Hospitalist
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Adult Health
Nurse Practitioner
Ophthalmology
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 99 MONTECILLO RD, SAN RAFAEL, CA 949033308 (Tel: 4154442000)
Recorded as PHYLLIS WON, PA-C
Physician Assistant (license number reported to NPPES: CA PA62195)
NPI status registered as active in NPPES database
Registered at 50 ACACIA AVE, SAN RAFAEL, CA 949012230 (Tel: 4154574440)
Registered at PO BOX 20222, AMERICAN CANYON, CA 945030222 (Tel: 7077049757)
Recorded as PHYLLIS WON
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in San Rafael
- Jessica Capretto, PA-C
- Cynthia Galvez
- Miranda Nguyen
- Torsten Durkan
- Kelly Mckoin, PA-C
- Miguel Serrato, ATC OT-C
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Mailing Address
Po Box 20222
American Canyon, CA 945030222
Phone: 7077049757