Nathan Alyesh
Internal Medicine Physician · Tarzana, CA
Nathan Alyesh is an internal medicine physician with a practice address in Tarzana, California, and NPI 1417362856, issued on Jun 24, 2014. Check the license (California A146154, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nathan Alyesh
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A146154 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18321 Clark St, Tarzana, CA 91356
- Phone
- (818) 881-0800
- Enumerated
- Jun 24, 2014
- Record last updated
- May 9, 2022
- Medicare enrollment
- Enrolled (PECOS I20171215001909); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 18321 Clark St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nathan Alyesh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A146154Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average internal medicine physician in 2024
825 Medicare Part D claims for 244 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 49 claims were for opioids.
Most prescribed
- Pantoprazole Sodium37 claims
- Amlodipine Besylate33 claims
- Metoprolol Succinate33 claims
- Prednisone33 claims
- Cefdinir30 claims
- Furosemide21 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.
Bills Medicare through one group practice
- Cedars-Sinai Medical Care FoundationTarzana, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Alyesh among 17,696 internal medicine physician records in California
Nathan Alyesh is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2012 · median 2004 among the 11,065 with a school on file
- Record last updated2022 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
41 internal medicine physician records list a practice address in Tarzana
They are 41 of the 2,122 NPPES records with a practice address in Tarzana, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Tarzana → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Abrams, M.D.Tarzana, CA 913561881690865
- Kevin Berger, M.D.Tarzana, CA 913561972522704
- Samuel Elias, M.D.Tarzana, CA 913561982684023
- Azita Fakheri, MDTarzana, CA 913561669410270
- Jeffrey Galpin, M.D.Tarzana, CA 913561386679561
- David Grossman, M.D.Tarzana, CA 913561700843117
- Robert Kayland, M.D.Tarzana, CA 913561871558031
- Gerald Kovar, M.D.Tarzana, CA 913561306883699
Common questions
What is Nathan Alyesh's NPI number?
Nathan Alyesh's National Provider Identifier (NPI) is 1417362856, issued on Jun 24, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Alyesh located?
The NPPES record lists a practice address at 18321 Clark St, Tarzana, CA, 91356. Phone: (818) 881-0800. Providers update this record themselves, so call before visiting.
How can I verify Nathan Alyesh's license?
NPPES lists California license number A146154, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan Alyesh prescribe under Medicare Part D?
In 2024, Nathan Alyesh had 825 Medicare Part D claims for 244 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.