NPPES file of Aug 9, 2026

Kathryn Dolores Simms, NP

Nurse Practitioner · Castro Valley, CA

Kathryn Dolores Simms, NP is a nurse practitioner with a practice address in Castro Valley, California, and NPI 1447770359, issued on Jun 21, 2017. Check the license (California 95016506, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1447770359
Name
Kathryn Dolores Simms
Credential
NP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
95016506 CA
Self-reported in NPPES; status is on the state search
Practice location
20055 Lake Chabot RD Ste 130, Castro Valley, CA 94546
Phone
(415) 885-3882
Enumerated
Jun 21, 2017
Record last updated
Feb 1, 2024
Medicare enrollment
Enrolled (PECOS I20210520000162); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest nurse practitioner records → All 8,223 in California → Look up another NPI →

Also registered at 20055 Lake Chabot RD Ste 130

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Irene Dy, MDHematology (Internal Medicine) Physician1528393063
  2. Juliet Fong, PA-CPhysician Assistant1639968670
  3. Nitin Joshi, M.D.Hematology (Internal Medicine) Physician1154541423
  4. Mahboub Noori, MDHematology & Oncology Physician1831695915
  5. Arpeet Shah, M.D.Medical Oncology Physician1558780825
  6. Usha Sunkara, M.D,Hematology & Oncology Physician1346267028

Verify Kathryn Dolores Simms in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 95016506    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

25% more Medicare Part D claims than the average nurse practitioner in 2024

1,381 Medicare Part D claims for 279 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. 100 claims were for opioids.

  1. Kathryn Simms1,381
  2. Specialty average1,109

Most prescribed

  1. Eliquis105 claims
  2. Tamoxifen Citrate81 claims
  3. Prochlorperazine Maleate63 claims
  4. Gabapentin59 claims
  5. Hydroxyurea49 claims
  6. Mirtazapine48 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $97.16

4 payments; by number, the most common kind was food and beverage; the largest payer was Celgene Corporation. The 38,884 providers of this specialty with any payment received $791.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Kathryn Simms$97.16
  2. Specialty average$791.64

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

One hospital affiliation

  1. Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Kathryn Dolores Simms among 8,223 nurse practitioner records in California

Kathryn Dolores Simms, NP is one of 8,223 nurse practitioner records with a practice address in California. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 52% of them.

  • NPI issued2017 · 52% of these records are older, 44% newer
  • In a Medicare fileYes · 65% of these records are
  • In the CMS Doctors and Clinicians fileYes · 42% of these records are
  • Graduated2017 · median 2017 among the 3,425 with a school on file
  • Record last updated2024 · 45% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Nurse Practitioner providers in California

There are 8,223 nurse practitioner records in California.

All 8,223 in California → Every provider in Castro Valley → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Gianna Flaaten, NP-CCastro Valley, CA 945461275241119
  2. Gahfora Gorsi, NPCastro Valley, CA 945461225696396
  3. Heather KurzCastro Valley, CA 945461619515830
  4. Inna Lipkind, NPCastro Valley, CA 945461407563331
  5. Jacqueline Margolese, MSN, FNP-C, AG-ACNPCastro Valley, CA 945461205378668
  6. Lynne Orr, NPCastro Valley, CA 945461235698713
  7. Yalda Bahrani, FNP-CHayward, CA 945451770182388
  8. Ann Bonner, FNP-BCHercules, CA 945471477102515

Common questions

What is Kathryn Dolores Simms, NP's NPI number?

Kathryn Dolores Simms, NP's National Provider Identifier (NPI) is 1447770359, issued on Jun 21, 2017. An NPI identifies a provider in billing; it is not a license.

Where is Kathryn Dolores Simms, NP located?

The NPPES record lists a practice address at 20055 Lake Chabot RD Ste 130, Castro Valley, CA, 94546. Phone: (415) 885-3882. Providers update this record themselves, so call before visiting.

How can I verify Kathryn Dolores Simms, NP's license?

NPPES lists California license number 95016506, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Kathryn Dolores Simms, NP prescribe under Medicare Part D?

In 2024, Kathryn Dolores Simms, NP had 1,381 Medicare Part D claims for 279 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.