Philip L. Chatham, M.D.
Medical Oncology Physician · San Gabriel, CA
Philip L. Chatham, M.D. is a medical oncology physician with a practice address in San Gabriel, California, and NPI 1740279264, issued on Oct 18, 2005. Check the license (California A32433, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Philip L. Chatham
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- A32433 CA
Self-reported in NPPES; status is on the state search - Practice location
- 207 S Santa Anita St Ste P05, San Gabriel, CA 91776
- Phone
- (626) 652-7433
- Enumerated
- Oct 18, 2005
- Record last updated
- May 2, 2025
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 207 S Santa Anita St Ste P05
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Catherine ChanNurse Practitioner1821697525
- Ailin LiFamily Nurse Practitioner1073327177
- Jieying Liu, MDMedical Oncology Physician1609404870
- Phuong TranNurse Practitioner1518326107
- Dong Xiang, MDHematology & Oncology Physician1235332925
Verify Philip L. Chatham in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A32433Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average medical oncology physician in 2024
11 Medicare Part D claims, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Philip L. Chatham among 447 medical oncology physician records in California
Philip L. Chatham, M.D. is one of 447 medical oncology physician records with a practice address in California. 82% 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, 94% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2025 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in California
There are 447 medical oncology physician records in California.
All 447 in California → Every provider in San Gabriel → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Jieying Liu, MDSan Gabriel, CA 917761609404870
- Eric Chang, MDMonterey Park, CA 917541427123488
- Eduardo Siccion, MDLa Verne, CA 917501083701965
- Robert Morgan, MDGlendora, CA 917411285741223
- Behnam Ebrahimi, M.D.Rancho Cucamonga, CA 917391033165139
- Michael Saville, MDCarlsbad, CA 920081689928533
- Steven Reich, M.D.Del Mar, CA 920141396876330
- Muneeb Choudry, M.D.Escondido, CA 920291518924323
Common questions
What is Philip L. Chatham, M.D.'s NPI number?
Philip L. Chatham, M.D.'s National Provider Identifier (NPI) is 1740279264, issued on Oct 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Philip L. Chatham, M.D. located?
The NPPES record lists a practice address at 207 S Santa Anita St Ste P05, San Gabriel, CA, 91776. Phone: (626) 652-7433. Providers update this record themselves, so call before visiting.
How can I verify Philip L. Chatham, M.D.'s license?
NPPES lists California license number A32433, 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 Philip L. Chatham, M.D. prescribe under Medicare Part D?
In 2024, Philip L. Chatham, M.D. had 11 Medicare Part D claims; the average among medical oncology physician prescribers was 703. 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.