William H. Isacoff, M.D.
Hematology & Oncology Physician · Santa Monica, CA
William H. Isacoff, M.D. is a hematology & oncology physician with a practice address in Santa Monica, California, and NPI 1891773123, issued on Jan 6, 2006. Check the license (California G24596, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William H. Isacoff
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- G24596 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2811 Wilshire Blvd Ste 414, Santa Monica, CA 90403
- Phone
- (310) 824-4133
- Enumerated
- Jan 6, 2006
- Record last updated
- May 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (310) 201-6685
- Medicaid ID
- 00G245960 CA
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 2811 Wilshire Blvd Ste 414
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Neal Chawla, M.D./ M.B.B.S.Hematology & Oncology Physician1669906665
- Ted KimPhysician Assistant1174303713
- Ania MoradkhaniNurse Practitioner1689186454
- Steven Wong, MDHematology & Oncology Physician1275553307
Verify William H. Isacoff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G24596Check 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 hematology & oncology physician in 2024
226 Medicare Part D claims for 18 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 41% of claims. 15 claims were for opioids.
Most prescribed
- Creon55 claims
- Granisetron Hcl27 claims
- Valacyclovir19 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: $845.88
34 payments; by number, the most common kind was food and beverage; the largest payer was Incyte Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William H. Isacoff among 1,583 hematology & oncology physician records in California
William H. Isacoff, M.D. is one of 1,583 hematology & oncology physician records with a practice address in California. 83% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 54% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% of these records are
- 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 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Santa Monica → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Neal Chawla, M.D./ M.B.B.S.Santa Monica, CA 904031669906665
- Steven Wong, MDSanta Monica, CA 904031275553307
- Thompson Adams, MDSanta Monica, CA 904041407880891
- Peter Boasberg, MDSanta Monica, CA 904041417982331
- Richard Finn, MDSanta Monica, CA 904041811912074
- Sean Fischer, M.D.Santa Monica, CA 904041801842943
- Omid Hamid, M.D.Santa Monica, CA 904041215966775
- Kathryn Henick, M.D.Santa Monica, CA 904041912972779
Common questions
What is William H. Isacoff, M.D.'s NPI number?
William H. Isacoff, M.D.'s National Provider Identifier (NPI) is 1891773123, issued on Jan 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William H. Isacoff, M.D. located?
The NPPES record lists a practice address at 2811 Wilshire Blvd Ste 414, Santa Monica, CA, 90403. Phone: (310) 824-4133. Providers update this record themselves, so call before visiting.
How can I verify William H. Isacoff, M.D.'s license?
NPPES lists California license number G24596, 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 H. Isacoff, M.D. prescribe under Medicare Part D?
In 2024, William H. Isacoff, M.D. had 226 Medicare Part D claims for 18 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.