NPPES file of Aug 9, 2026

Diane Kay Koester, RN, NP

Adult Health Nurse Practitioner · La Jolla, CA

Diane Kay Koester, RN, NP is an adult health nurse practitioner with a practice address in La Jolla, California, and NPI 1962663658, issued on Jun 24, 2008. Check the license (California NP 11678, 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
1962663658
Name
Diane Kay Koester
Credential
RN, NP
Primary taxonomy
Adult Health Nurse Practitioner 363LA2200X
License number
NP 11678 CA
Self-reported in NPPES; status is on the state search
Practice location
9834 Genesee Ave Ste 300, La Jolla, CA 92037
Phone
(858) 625-4488
Enumerated
Jun 24, 2008
Record last updated
Jul 20, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(858) 625-7995
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 9834 Genesee Ave Ste 300

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

  1. Cindy Daversa, M.S., R.D., C.D.E.Registered Dietitian1518144161
  2. Colette GahrHealth Educator1194578849
  3. Rachel Hannah Macam, RDRegistered Dietitian1154098929
  4. Ariane McClellan, R.N.Diabetes Educator Registered Nurse1548347735
  5. Erica Neubert, NPFamily Nurse Practitioner1801361993
  6. Clare Pinder, DNPFamily Nurse Practitioner1699399196

Verify Diane Kay Koester 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 NP 11678    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

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68% fewer Medicare Part D claims than the average adult health nurse practitioner in 2024

414 Medicare Part D claims for 51 beneficiaries, against an average of 1,280 among the 16,937 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.

  1. Diane Koester414
  2. Specialty average1,280

Most prescribed

  1. Clopidogrel41 claims
  2. Atorvastatin Calcium38 claims
  3. Losartan Potassium25 claims
  4. Metoprolol Tartrate19 claims
  5. Amlodipine Besylate16 claims
  6. Carvedilol15 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: $31.26

2 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 12,291 providers of this specialty with any payment received $946.40 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Diane Koester$31.26
  2. Specialty average$946.40

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

Adult Health Nurse Practitioner providers in California

There are 1,405 adult health nurse practitioner records in California.

All 1,405 in California → Every provider in La Jolla →

Other adult health nurse practitioner records in California

  1. Joel Aandahl, NPVallejo, CA1891423653
  2. Corey Abbott, N.P.Claremont, CA1457766107
  3. Melanie Abbott, RNSan Diego, CA1124812730
  4. Michael Abney, FNPPleasanton, CA1336336833
  5. Ilona Abramova, NPWest Hills, CA1588066179
  6. Angela Acfalle, NP CNSLa Jolla, CA1013983857
  7. Mary Ackerman, NPRichmond, CA1154406155
  8. Marie Acorda Reece, NPLos Angeles, CA1528331485
  9. Judith Adams, C-ANPSanta Clarita, CA1831109297
  10. James AgatepSanta Ana, CA1578939153

Common questions

What is Diane Kay Koester, RN, NP's NPI number?

Diane Kay Koester, RN, NP's National Provider Identifier (NPI) is 1962663658, issued on Jun 24, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Diane Kay Koester, RN, NP located?

The NPPES record lists a practice address at 9834 Genesee Ave Ste 300, La Jolla, CA, 92037. Phone: (858) 625-4488. Providers update this record themselves, so call before visiting.

How can I verify Diane Kay Koester, RN, NP's license?

NPPES lists California license number NP 11678, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Diane Kay Koester, RN, NP prescribe under Medicare Part D?

In 2024, Diane Kay Koester, RN, NP had 414 Medicare Part D claims for 51 beneficiaries; the average among adult health nurse practitioner prescribers was 1,280. 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.