Kathryn Dolores Simms , NP
Nurse Practitioner • Castro Valley, CA
20055 Lake Chabot Rd Ste 130
Castro Valley, CA 945465332
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 June 21, 2017; this date does not establish years in practice.
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Published CMS data list 99,000 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- J0881 — Injection, darbepoetin alfa, 1 microgram (non-esrd use): 34,000 service units.
- J1439 — Injection, ferric carboxymaltose, 1 mg: 31,500 service units.
- J9271 — Injection, pembrolizumab, 1 mg: 12,200 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
See all 34 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 1,114 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:
- Eliquis (Apixaban) — 105 prescription fills, including refills.
- Tamoxifen Citrate — 81 prescription fills, including refills.
- Prochlorperazine Maleate — 63 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 37 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: 201. Middle half: 73 to 538.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 150 in 2021 to 99,000 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021–2024.
Practice Location & Contact Primary Location
20055 Lake Chabot Rd Ste 130
Castro Valley, CA 945465332
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Stanford Health Care. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2017
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
355 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $1,104,665 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $879,920 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
1,552 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
$2,981,674 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: $53.11 across 2 records.
By nature of payment
- Food and Beverage: $53.11 across 2 records.
Reporting-company totals
- Daiichi Sankyo Inc.: $29.83 across 1 record.
- Bristol Myers Squibb Company: $23.28 across 1 record.
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).
Years since graduation
9 years (graduated 2017)
CMS Doctors and Clinicians data list 2017 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2017
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.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
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?”
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Kathryn Simms 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 Kathryn Simms 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 Castro Valley and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: 201. Middle half: 73 to 538.
Too few clinicians listed under Nurse Practitioner in Castro Valley have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: $18,428. Middle half: $6,851 to $46,917.
Too few clinicians listed under Nurse Practitioner in Castro Valley have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: $13,640. Middle half: $4,992 to $34,836.
Too few clinicians listed under Nurse Practitioner in Castro Valley have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 80% of clinicians listed under Nurse Practitioner in California (2024, 3,221 clinicians with data). Median for this group: 248. Middle half: 63 to 852.
Too few clinicians listed under Nurse Practitioner in Castro Valley have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 95% 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.
Too few clinicians listed under Nurse Practitioner in Castro Valley have Medicare Part D data for 2024 to compare.
8 active clinicians are listed under Nurse Practitioner with a practice address in Castro Valley, CA (8,237 in California).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 65900% from 150 in 2021 to 99,000 in 2024.
- 2021: 150
- 2022: 384
- 2023: 55,877
- 2024: 99,000
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Medicare-allowed amount
Medicare-allowed amount increased 5163% from $20,991 in 2021 to $1,104,665 in 2024.
- 2021: $20,991
- 2022: $12,231
- 2023: $238,056
- 2024: $1,104,665
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Paid by Medicare
Paid by Medicare increased 5174% from $16,683 in 2021 to $879,920 in 2024.
- 2021: $16,683
- 2022: $9,695
- 2023: $187,715
- 2024: $879,920
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 658% from 147 in 2020 to 1,114 in 2024.
- 2020: 147
- 2021: 103
- 2022: 64
- 2023: 730
- 2024: 1,114
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30-day fills
30-day fills increased 925% from 151 in 2020 to 1,552 in 2024.
- 2020: 151
- 2021: 114
- 2022: 64
- 2023: 1,053
- 2024: 1,552
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Part D drug cost
Part D drug cost increased 464% from $529,034 in 2020 to $2,981,674 in 2024.
- 2020: $529,034
- 2021: $77,638
- 2022: $560,768
- 2023: $1,405,978
- 2024: $2,981,674
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $235.16 in 2021 to $53.11 in 2025.
- 2021: $235.16
- 2022: $85.43
- 2023: $324.92
- 2024: $113.16
- 2025: $53.11
Sources: CMS Medicare Physician & Other Practitioners (2024), 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): fewer than 11 records totaling $53.11.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Daiichi Sankyo Inc. |
Food and Beverage
In-kind items and services
|
Enhertu | General | $29.83 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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REBLOZYL | General | $23.28 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2020–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2021–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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J0881
Injection, darbepoetin alfa, 1 microgram (non-esrd use)
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34,000 | 44 | $31.72 | $2.94 |
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J1439
Injection, ferric carboxymaltose, 1 mg
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31,500 | 30 | $9.75 | $1.09 |
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J9271
Injection, pembrolizumab, 1 mg
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12,200 | 15 | $267.86 | $56.12 |
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J1453
Injection, fosaprepitant, 1 mg
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5,700 | 18 | $3.09 | $0.14 |
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J9267
Injection, paclitaxel, 1 mg
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4,618 | 12 | $2.97 | $0.10 |
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J0897
Injection, denosumab, 1 mg
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3,660 | 22 | $121.43 | $25.46 |
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J1100
Injection, dexamethasone sodium phosphate, 1 mg
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1,804 | 65 | $3.61 | $0.11 |
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J1568
Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg
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1,330 | 12 | $212.01 | $45.60 |
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J2469
Injection, palonosetron hcl, 25 mcg
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670 | 24 | $61.64 | $0.85 |
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85025
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count
|
476 | 215 | $35.00 | $7.58 |
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J2405
Injection, ondansetron hydrochloride, per 1 mg
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468 | 21 | $4.83 | $0.09 |
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96375
Injection of additional new drug or substance into vein
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370 | 79 | $125.38 | $16.86 |
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J2506
Injection, pegfilgrastim, excludes biosimilar, 0.5 mg
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348 | 17 | $1160.10 | $63.73 |
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96372
Injection of drug or substance under skin or into muscle
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310 | 102 | $110.32 | $15.11 |
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J9045
Injection, carboplatin, 50 mg
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232 | 16 | $43.66 | $3.44 |
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96413
Administration of chemotherapy into vein, 1 hour or less
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197 | 57 | $1111.72 | $147.27 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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142 | 89 | $339.35 | $92.96 |
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96365
Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less
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103 | 50 | $390.90 | $71.02 |
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J1200
Injection, diphenhydramine hcl, up to 50 mg
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88 | 44 | $17.86 | $0.77 |
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J3489
Injection, zoledronic acid, 1 mg
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84 | 12 | $36.46 | $6.57 |
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96417
Administration of additional new drug or substance into vein, 1 hour or less
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75 | 27 | $399.20 | $71.73 |
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96366
Infusion into a vein for therapy, prevention, or diagnosis, each additional hour
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71 | 17 | $115.11 | $22.06 |
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J9217
Leuprolide acetate (for depot suspension), 7.5 mg
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69 | 15 | $846.49 | $178.04 |
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J3420
Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg
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61 | 25 | $34.14 | $1.23 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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55 | 43 | $460.13 | $128.62 |
(top 25 shown)
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
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 |
|---|---|---|---|---|---|
| Eliquis | Apixaban | 105 | 3,394 | $65,977.38 | 26 |
| Tamoxifen Citrate | Tamoxifen Citrate | 81 | 5,010 | $1,656.04 | 27 |
| Prochlorperazine Maleate | Prochlorperazine Maleate | 63 | 1,347 | $1,339.45 | 40 |
| Gabapentin | Gabapentin | 59 | 2,604 | $1,182.63 | 25 |
| Hydroxyurea | Hydroxyurea | 49 | 2,471 | $602.03 | 13 |
| Mirtazapine | Mirtazapine | 48 | 1,755 | $777.40 | 20 |
| Ondansetron Hcl | Ondansetron Hcl | 46 | 1,149 | $1,189.85 | 31 |
| Dexamethasone | Dexamethasone | 44 | 628 | $491.62 | 13 |
| Acyclovir | Acyclovir | 38 | 1,500 | $393.21 | — |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 36 | 670 | $706.16 | 14 |
| Brukinsa | Zanubrutinib | 36 | 1,080 | $480,248.21 | — |
| Prednisone | Prednisone | 34 | 849 | $142.88 | 13 |
| Letrozole | Letrozole | 34 | 2,280 | $571.57 | 16 |
| Xtandi | Enzalutamide | 32 | 960 | $422,060.85 | — |
| Revlimid | Lenalidomide | 31 | 798 | $594,502.82 | — |
| Alendronate Sodium | Alendronate Sodium | 28 | 1,904 | $106.85 | — |
| Lorazepam | Lorazepam | 27 | 465 | $94.01 | 18 |
| Trazodone Hcl | Trazodone Hcl | 26 | 1,020 | $126.14 | — |
| Imbruvica | Ibrutinib | 22 | 638 | $245,464.99 | — |
| Montelukast Sodium | Montelukast Sodium | 21 | 201 | $92.72 | — |
| Pantoprazole Sodium | Pantoprazole Sodium | 21 | 1,300 | $219.67 | 11 |
| Anastrozole | Anastrozole | 21 | 1,830 | $563.15 | — |
| Xarelto | Rivaroxaban | 19 | 1,050 | $19,419.84 | — |
| Morphine Sulfate Er | Morphine Sulfate | 18 | 525 | $682.37 | — |
| Ondansetron Odt | Ondansetron | 16 | 370 | $270.49 | 11 |
(top 25 shown)
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: 2024-02-01NUCC 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
I20210520000162
CA
7214273382
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Stanford Health Care
300 Pasteur Dr, Stanford, CA 943052200
Phone: 6507234000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine - Medical Oncology
Doctor of Medicine (M.D.)
Nurse Practitioner
Doctor of Nursing Practice
Physician Assistant
Physician Assistant (Certified)
Internal Medicine - Critical Care Medicine
Doctor of Medicine (M.D.)
Thoracic Surgery (Cardiothoracic Vascular Surgery)
Doctor of Medicine (M.D.)
Surgery
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 20055 LAKE CHABOT RD STE 130, CASTRO VALLEY, CA 945465332 (Tel: 4158853882)
Registered at 20055 LAKE CHABOT RD STE 130, CASTRO VALLEY, CA 945465332 (Tel: 4158853882)
Nurse Practitioner (license number reported to NPPES: CA 95016506)
Registered at 5725 W LAS POSITAS BLVD STE 100A, PLEASANTON, CA 945884054 (Tel: 9257348130)
Registered at 5725 W LAS POSITAS BLVD STE 100A, PLEASANTON, CA 945884054 (Tel: 9257348130)
Recorded as KATHRYN SIMMS, NP
Registered at 1825 4TH ST FL 6, SAN FRANCISCO, CA 941432350 (Tel: 4153537151)
Registered at 1825 4TH ST FL 6, SAN FRANCISCO, CA 941432350 (Tel: 4153537151)
Registered at 161 FORT WASHINGTON AVE FL 3, NEW YORK, NY 100323729 (Tel: 4158675714)
Registered at 630 W 168TH ST # 4, NEW YORK, NY 100323725 (Tel: 4158675714)
NPI status registered as active in NPPES database
Registered at 20 EXCHANGE PLACE APT 1126, NEW YORK, NY 10005 (Tel: (415) 867-5714)
Registered at 20 EXCHANGE PL APT 1126, NEW YORK, NY 100053232 (Tel: 4158675714)
Recorded as KATHRYN SIMMS, RN
Registered Nurse (license number reported to NPPES: NY 719381)
NPI status registered as active in NPPES database
Registered at 20 EXCHANGE PLACE APT 1126, NEW YORK, NY 10005 (Tel: (415) 867-5714)
Registered at 20 EXCHANGE PL APT 1126, NEW YORK, NY 100053232 (Tel: 4158675714)
Recorded as KATHRYN SIMMS, RN
Registered Nurse (license number reported to NPPES: NY 719381)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Castro Valley
- Analise Eastman Hawkins, MS, FNP
- Lynne Orr, NP
- Heather Kurz
- Jacqueline Margolese, MSN, FNP-C, AG-ACNP
- Gahfora Gorsi, NP
- Inna Lipkind, NP
Mailing Address
20055 Lake Chabot Rd Ste 130
Castro Valley, CA 945465332
Phone: 4158853882