William Lawler, MD
Hematology & Oncology Physician · Fullerton, CA
William Lawler, MD is a hematology & oncology physician with a practice address in Fullerton, California, and NPI 1700886702, issued on Aug 1, 2005. Check the license (California G16403, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Lawler
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- G16403 CA
G16403 AR
Self-reported in NPPES; status is on the state search - Practice location
- 2151 N Harbor Blvd, Fullerton, CA 92835
- Phone
- (714) 446-5900
- Enumerated
- Aug 1, 2005
- Record last updated
- Apr 26, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (714) 446-5800
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 2151 N Harbor Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Philip Molina, DPTOrthopedic Physical Therapist1336347855
Verify William Lawler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G16403Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $136.29
6 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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 Lawler among 1,583 hematology & oncology physician records in California
William Lawler, MD 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% of these records are
- Record last updated2013 · 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 Fullerton → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Steven Kim, MDFullerton, CA 928351003886698
- Monica Lee, M.D.Fullerton, CA 928351215129309
- Yung Lyou, M.D., PH.D.Fullerton, CA 928351013277342
- Roy Panares, MDFullerton, CA 928351285837229
- Devi Jane Asuncion, MDAnaheim, CA 928071538367875
- Ashraf Aziz, MDAnaheim, CA 928071386715365
- Farah Brasfield, MDAnaheim, CA 928071730256629
- David Choi, MDAnaheim, CA 928071760559629
Common questions
What is William Lawler, MD's NPI number?
William Lawler, MD's National Provider Identifier (NPI) is 1700886702, issued on Aug 1, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William Lawler, MD located?
The NPPES record lists a practice address at 2151 N Harbor Blvd, Fullerton, CA, 92835. Phone: (714) 446-5900. Providers update this record themselves, so call before visiting.
How can I verify William Lawler, MD's license?
NPPES lists California license number G16403, 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.
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.