Robert John Klen, PHARM.D.
Pharmacist · Walnut Creek, CA
Robert John Klen, PHARM.D. is a pharmacist with a practice address in Walnut Creek, California, and NPI 1659764728, issued on Mar 12, 2015. Check the license (California 39818, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Robert John Klen
- Credential
- PHARM.D.
- Primary taxonomy
- Pharmacist 183500000X
- License number
- 39818 CA
Self-reported in NPPES; status is on the state search - Practice location
- 600 S Broadway, Walnut Creek, CA 94596
- Phone
- (925) 945-3440
- Enumerated
- Mar 12, 2015
- Record last updated
- Mar 12, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (925) 945-3645
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 32,533 in California → Look up another NPI →
Also registered at 600 S Broadway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Farah Yousif Samaan, PHARMDPharmacist1821893405
Verify Robert John Klen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 39818Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 100% of the cost of the top drugs
46 Medicare Part D claims for 44 beneficiaries, against an average of 119 among the 28,524 providers of this specialty who prescribed in Part D. Brand-name drugs were 100% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Shingrix21 claims
- Arexvy15 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.
Robert John Klen among 32,533 pharmacist records in California
Robert John Klen, PHARM.D. is one of 32,533 pharmacist records with a practice address in California. 15% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 41% of them.
- NPI issued2015 · 41% of these records are older, 53% newer
- In a Medicare fileYes · 15% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2015 · 76% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 183500000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
239 pharmacist records list a practice address in Walnut Creek
They are 239 of the 6,170 NPPES records with a practice address in Walnut Creek, and 32,533 pharmacist records in California.
All 32,533 in California → Every provider in Walnut Creek → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Beckilynn CatalliWalnut Creek, CA 945961447318605
- Derek Dwinell, PHARM. D.Walnut Creek, CA 945961629146378
- Elizabeth Farr, BPHARMWalnut Creek, CA 945961033277082
- Audrey Fong, PHARM.D.Walnut Creek, CA 945961922170521
- Venessa Jn-BaptisteWalnut Creek, CA 945961215095443
- Hansheng Liou, PHARM.D.Walnut Creek, CA 945961508924036
- Zahi Mouchabeck, PHARM.DWalnut Creek, CA 945961306904396
- Denise Omen, RPHWalnut Creek, CA 945961598838773
Common questions
What is Robert John Klen, PHARM.D.'s NPI number?
Robert John Klen, PHARM.D.'s National Provider Identifier (NPI) is 1659764728, issued on Mar 12, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Robert John Klen, PHARM.D. located?
The NPPES record lists a practice address at 600 S Broadway, Walnut Creek, CA, 94596. Phone: (925) 945-3440. Providers update this record themselves, so call before visiting.
How can I verify Robert John Klen, PHARM.D.'s license?
NPPES lists California license number 39818, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Robert John Klen, PHARM.D. prescribe under Medicare Part D?
In 2024, Robert John Klen, PHARM.D. had 46 Medicare Part D claims for 44 beneficiaries; the average among pharmacist prescribers was 119. 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.
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.