William I. Kaplan, DO
Family Medicine Physician · Los Angeles, CA
William I. Kaplan, DO is a family medicine physician with a practice address in Los Angeles, California, and NPI 1154480770, issued on Dec 8, 2006. Check the license (California 20A5418, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William I. Kaplan
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A5418 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4733 W Sunset Blvd, Los Angeles, CA 90027
- Phone
- (323) 783-4011
- Enumerated
- Dec 8, 2006
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050805000645); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 4733 W Sunset Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William I. Kaplan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A5418Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average family medicine physician in 2024
2,388 Medicare Part D claims for 615 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Atorvastatin Calcium212 claims
- Amlodipine Besylate170 claims
- Lisinopril156 claims
- Rosuvastatin Calcium136 claims
- Losartan Potassium126 claims
- Tamsulosin Hcl70 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
- Southern California Permanente Medical GroupGlendale, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William I. Kaplan among 17,133 family medicine physician records in California
William I. Kaplan, DO is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1983 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
829 family medicine physician records list a practice address in Los Angeles
They are 829 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Los Angeles → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
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- Letitia Ho, MDLos Angeles, CA 900271922179837
- Thomas Horowitz, D.O.Los Angeles, CA 900271538113444
- Scott Howell, DOLos Angeles, CA 900271831182591
- Tony Hwang, MDLos Angeles, CA 900271093886053
- Joanne Mogannam, MDLos Angeles, CA 900271124199005
- Anthony Morena, MDLos Angeles, CA 900271487725461
Common questions
What is William I. Kaplan, DO's NPI number?
William I. Kaplan, DO's National Provider Identifier (NPI) is 1154480770, issued on Dec 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William I. Kaplan, DO located?
The NPPES record lists a practice address at 4733 W Sunset Blvd, Los Angeles, CA, 90027. Phone: (323) 783-4011. Providers update this record themselves, so call before visiting.
How can I verify William I. Kaplan, DO's license?
NPPES lists California license number 20A5418, 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 William I. Kaplan, DO prescribe under Medicare Part D?
In 2024, William I. Kaplan, DO had 2,388 Medicare Part D claims for 615 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.