Diana Marie Thelen, PHARM D
Pharmacist · Simi Valley, CA
Diana Marie Thelen, PHARM D is a pharmacist with a practice address in Simi Valley, California, and NPI 1033404389, issued on Jun 15, 2011. Check the license (California 53646, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Diana Marie Thelen
- Credential
- PHARM D
- Primary taxonomy
- Pharmacist 183500000X
- License number
- 53646 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4440 Alamo St, Simi Valley, CA 93063
- Phone
- (805) 522-3120
- Enumerated
- Jun 15, 2011
- Record last updated
- Jun 22, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (805) 522-3120
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 32,533 in California → Look up another NPI →
Also registered at 4440 Alamo St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dah Hsu, PHARMDPharmacist1346581006
- Jenna Mae ManuelPharmacy Technician1063006286
- Kian MehraraPharmacist1548143720
- Kayla Mari Vale Cruz, PHARMDPharmacist1659252146
- Jeena VargesePharmacist1336512706
Verify Diana Marie Thelen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 53646Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average pharmacist in 2024
14 Medicare Part D claims for 14 beneficiaries, against an average of 119 among the 28,524 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Naloxone Hcl14 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.
Diana Marie Thelen among 32,533 pharmacist records in California
Diana Marie Thelen, 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 2011, is newer than 18% of them.
- NPI issued2011 · 18% of these records are older, 72% 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 updated2012 · 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).
91 pharmacist records list a practice address in Simi Valley
They are 91 of the 1,397 NPPES records with a practice address in Simi Valley, and 32,533 pharmacist records in California.
All 32,533 in California → Every provider in Simi Valley → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Sargis Avanesyan, RPHSimi Valley, CA 930631407039886
- Nguyet Banh, PHARM.D.Simi Valley, CA 930631003803008
- Jean BarkerSimi Valley, CA 930631700273521
- Samir DeiboSimi Valley, CA 930631295114163
- Gloria EffarahSimi Valley, CA 930631891195343
- Dah Hsu, PHARMDSimi Valley, CA 930631346581006
- Rafeek IskanderSimi Valley, CA 930631194045989
- Amgad Masih, RPHSimi Valley, CA 930631043554587
Common questions
What is Diana Marie Thelen, PHARM D's NPI number?
Diana Marie Thelen, PHARM D's National Provider Identifier (NPI) is 1033404389, issued on Jun 15, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Diana Marie Thelen, PHARM D located?
The NPPES record lists a practice address at 4440 Alamo St, Simi Valley, CA, 93063. Phone: (805) 522-3120. Providers update this record themselves, so call before visiting.
How can I verify Diana Marie Thelen, PHARM D's license?
NPPES lists California license number 53646, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Diana Marie Thelen, PHARM D prescribe under Medicare Part D?
In 2024, Diana Marie Thelen, PHARM D had 14 Medicare Part D claims for 14 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.