Stephanie Martha Chiu , NP
Nurse Practitioner • Walnut Creek, CA
500 Lennon Ln
Walnut Creek, CA 945982415
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 October 10, 2023; this date does not establish years in practice.
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Published CMS data list 351 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Ondansetron Odt (Ondansetron) — 51 prescription fills, including refills.
- Prochlorperazine Maleate — 50 prescription fills, including refills.
- Lorazepam — 42 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 14 records in the table · Guide: How to read Medicare Part D prescriber data
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Close to the middle for Part D prescriptions among clinicians listed under Nurse Practitioner in Walnut Creek, CA (2024, 27 clinicians with data). Median for this group: 450. Middle half: 63 to 1,244.
Close to the middle for Part D prescriptions among clinicians listed under Nurse Practitioner in California (2024, 3,221 clinicians with data). Median for this group: 248. Middle half: 63 to 852.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
Practice Location & Contact Primary Location
500 Lennon Ln
Walnut Creek, CA 945982415
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
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
415 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
$480,363 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 – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $5,038.97 across 196 records.
By nature of payment
- Food and Beverage: $4,744.33 across 193 records.
- Education: $294.64 across 3 records.
Reporting-company totals (3 largest of 54)
- AstraZeneca Pharmaceuticals LP: $636.38 across 20 records.
- Janssen Pharmaceuticals, Inc: $446.28 across 21 records.
- Pfizer Inc.: $403.95 across 19 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
NPI first issued
2023
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, “Does your provider accept Medicare as full payment?”
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)
Stephanie Chiu 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 Stephanie Chiu 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 Walnut Creek and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Close to the middle for clinicians listed under Nurse Practitioner in Walnut Creek, CA (2024, 27 clinicians with data). Median for this group: 450. Middle half: 63 to 1,244.
Close to the middle for clinicians listed under Nurse Practitioner in California (2024, 3,221 clinicians with data). Median for this group: 248. Middle half: 63 to 852.
Part D drug cost
A higher Part D drug cost than 90% of clinicians listed under Nurse Practitioner in Walnut Creek, CA (2024, 27 clinicians with data). Median for this group: $32,751. Middle half: $2,821 to $117,812.
A higher Part D drug cost than 90% of clinicians listed under Nurse Practitioner in California (2024, 3,221 clinicians with data). Median for this group: $13,982. Middle half: $995 to $121,041.
70 active clinicians are listed under Nurse Practitioner with a practice address in Walnut Creek, CA (8,237 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Walnut Creek
24.3% of these 70 clinicians have the CMS telehealth indicator.
40% of these 70 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)
Industry payments (Open Payments) went from $294.99 in 2023 to $5,038.97 in 2025.
- 2023: $294.99
- 2024: $4,709.80
- 2025: $5,038.97
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 2025 (payments made January 1 – December 31, 2025): 196 records totaling $5,038.97.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
— | General | $124.99 |
| Astellas Pharma US Inc |
Education
In-kind items and services
|
— | General | $99.99 |
| Pfizer Inc. |
Education
In-kind items and services
|
— | General | $99.65 |
| Pfizer Inc. |
Education
In-kind items and services
|
— | General | $95.00 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
LYNPARZA | General | $47.36 |
| Spectrum Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
|
ROLVEDON | General | $41.99 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
|
CARVYKTI | General | $41.08 |
| Spectrum Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
|
ROLVEDON | General | $39.54 |
| JAZZ PHARMACEUTICALS INC. |
Food and Beverage
In-kind items and services
|
ZIIHERA | General | $39.26 |
| Deciphera Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
|
QINLOCK | General | $38.27 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
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PADCEV | General | $38.04 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
WAYRILZ | General | $36.55 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
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IBRANCE | General | $36.41 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
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WAYRILZ | General | $34.92 |
| Genentech, Inc. |
Food and Beverage
In-kind items and services
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Tecentriq | General | $34.92 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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OPDIVO | General | $34.88 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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KISQALI | General | $34.47 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
IBRANCE | General | $33.62 |
| Invivyd Inc |
Food and Beverage
In-kind items and services
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PEMGARDA | General | $33.51 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
|
ERLEADA | General | $33.43 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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JEMPERLI | General | $33.40 |
| Genentech, Inc. |
Food and Beverage
In-kind items and services
|
Itovebi | General | $33.34 |
| Merck Sharp & Dohme LLC |
Food and Beverage
In-kind items and services
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KEYTRUDA | General | $33.10 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
BRAFTOVI | General | $33.08 |
| Karyopharm Therapeutics Inc. |
Food and Beverage
In-kind items and services
|
XPOVIO | General | $32.73 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, 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 |
|---|---|---|---|---|---|
| Ondansetron Odt | Ondansetron | 51 | 582 | $675.42 | 42 |
| Prochlorperazine Maleate | Prochlorperazine Maleate | 50 | 1,151 | $1,341.37 | 36 |
| Lorazepam | Lorazepam | 42 | 700 | $344.19 | 29 |
| Acyclovir | Acyclovir | 30 | 1,320 | $521.49 | — |
| Revlimid | Lenalidomide | 26 | 686 | $474,372.59 | — |
| Lidocaine-Prilocaine | Lidocaine/Prilocaine | 25 | 644 | $332.59 | 21 |
| Dexamethasone | Dexamethasone | 25 | 466 | $436.31 | 13 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 19 | 1,108 | $195.43 | — |
| Famciclovir | Famciclovir | 18 | 960 | $1,614.05 | — |
| Prednisone | Prednisone | 17 | 382 | $69.30 | — |
| Letrozole | Letrozole | 14 | 780 | $141.29 | — |
| Levofloxacin | Levofloxacin | 12 | 154 | $113.95 | — |
| Gabapentin | Gabapentin | 11 | 320 | $108.88 | — |
| Zolpidem Tartrate | Zolpidem Tartrate | 11 | 390 | $95.97 | — |
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: 2023-10-10NUCC Taxonomy Code: 363L00000X
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20231122002512
CA
8022466481
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.
Nurse Practitioner
Nurse Practitioner
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Family Nurse Practitioner (Certified)
Nurse Practitioner - Family
Nurse Practitioner (Certified)
Internal Medicine - Hematology & Oncology
Doctor of Osteopathic Medicine (D.O.)
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)
Career & Practice History
NPI enumerated October 10, 2023.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from November 2023 to August 2026.
NPI Administrative Meta
Other Nurse Practitioners in Walnut Creek
- Monica De Witt, FNP
- Emily Cruz, NP
- Shannon Chakedis
- Rachel Valdez, NP-C
- Sarah Buenviaje, MSN, ONP
- Mariam Janzad, NP
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Mailing Address
500 Lennon Ln
Walnut Creek, CA 945982415
Phone: 9259399610