Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum
William H. Isacoff, M.D. Inc.
Hematology & Oncology Physician in Santa Monica, CA · enumerated 2006 · authorized official William Isacoff, Owner.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1538235189
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Registry record
Taxonomy & classification
Authorized official
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1487729489 | Other | CA | DME NPI |
| 1891773123 | Other | CA | INDIV NPI |
| 00G245960 | Medicaid | CA | - |
| ZZZ 66561 Z | Other | CA | BLUE SHIELD OF CA DME |
| 90024B002 | Other | CA | TRICARE PROV ID |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
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Providers at this address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-03.