Dr. Philip L. Chatham, MD
- Medicare services, 2023
- 16
- Part D claims, 2024
- 11
- Hospital affiliations
- 1
- Industry payments
- $6,695
- Medical groups
- 2
- Practice address
- 207 S Santa Anita St Ste P05 Suite P05, San Gabriel, CA 91776
- Practice phone
- Call (626) 652-7433
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
The Oncology Institute Ca - San Gabriel
Medical specialty practice · San Gabriel, California
Find Dr. Chatham's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Philip L. Chatham is a medical oncologist in Cerritos, California
Dr. Chatham practices at The Oncology Institute Ca - San Gabriel in San Gabriel, California.
Dr. Chatham's NPI, 1740279264, was assigned on October 18, 2005. Dr. Chatham graduated from University of Kerala Medical College in 1969. Dr. Chatham holds California license A32433.
- NPI
- 1740279264NPI Registry (opens in a new tab)
- NPI enumeration date
- October 18, 2005
- NPI status
- Active
- Practice phone
- (626) 652-7433
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 84
- Medical school graduation
- 1969
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Philip L. Chatham practices in San Gabriel and Cerritos
Dr. Chatham's primary practice is The Oncology Institute Ca - San Gabriel, at 207 S Santa Anita St Ste P05 Suite P05, San Gabriel, CA 91776. The practice phone is (626) 652-7433. The NPI Registry lists Dr. Chatham's practice address as 18000 Studebaker Rd, Cerritos, CA 90703.
- The Oncology Institute Ca - San GabrielPrimary207 S Santa Anita St Ste P05 Suite P05, San Gabriel, CA 91776Phone(626) 652-7433
- NPI Registry address18000 Studebaker Rd, Cerritos, CA 90703 · Los Angeles CountyPhone(626) 652-7433
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Philip L. Chatham is affiliated with 2 sites of care and 2 medical groups
Dr. Chatham's primary practice is The Oncology Institute Ca - San Gabriel in San Gabriel, California. Dr. Chatham is also affiliated with Providence Holy Cross Medical Center. The medical group on file is City of Hope. Dmand AI also links Dr. Chatham to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Philip L. Chatham's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chatham practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The Oncology Institute Ca - San Gabriel | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Philip L. Chatham is one of 415 medical oncologists in California
Medical oncology is Dr. Chatham's primary specialty in the NPI Registry, under taxonomy code 207RX0202X. Dr. Chatham is board certified in hematology by the American Board of Internal Medicine. Dr. Chatham is licensed in California.
Specialties and state licenses
- Medical oncology, CaliforniaPrimary
Clinical focus
Dmand AI lists breast cancer and neutropenia among the conditions Dr. Chatham treats.
Medical oncologists near Dr. Chatham
Counts of medical oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Philip L. Chatham billed Medicare for 16 services in 2023
CMS data shows 16 Medicare services from Dr. Chatham across 1 procedure code in 2023, all of them office visits. Medicare paid $1,354 for them. Every service was in an office.
Dr. Chatham's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 402023: 1660%
Dr. Chatham compared with the California median for medical oncologists, 2023
- Dr. Chatham
- California median
- Medicare services
- 16vs 49697% below
- Part D claims
- 50vs 14465% below
Medians across 358 medical oncologists in California with Dmand AI profiles that report each measure.
Dr. Chatham's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chatham and other medical oncologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Philip L. Chatham's patients have a median age of 67
Across all payers, Dmand AI patient panel data puts Dr. Chatham's median patient age at 67, with 64% women.
Dr. Chatham's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women64%
- Men36%
Source: Dmand AI Patient Panel Data
Dr. Philip L. Chatham wrote 11 Medicare Part D claims in 2024
In 2024, Dr. Chatham wrote 11 Medicare Part D claims. 100% of them were for generic drugs. They cover 2 drugs, with $1,129 in total drug cost. In 2022, CMS named 58 claims across 3 drugs.
Dr. Chatham's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 582023: 5014%
Drugs named by CMS: 2 in 2023, 3 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Philip L. Chatham received $6,695 in industry payments from 2016 to 2023
CMS Open Payments shows 267 general payments to Dr. Chatham from 49 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 81% of the total. Novartis Pharmaceuticals Corporation paid the most, $905.
General payments to Dr. Chatham by program year, 2016 to 2023
General payments to Dr. Chatham by kind, 2016 to 2023
- Food and beverage$5,45481%
- Education$74211%
- Device or supply loans$4997%
Companies that paid Dr. Chatham the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Philip L. Chatham has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Chatham, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Chatham
- 2013
- CMS Stage 1 EHR
- Undated
- Super Doc
Source: Dmand AI Professional Profile Data
Dr. Philip L. Chatham graduated from University of Kerala Medical College
Dr. Chatham graduated from University of Kerala Medical College in 1969.
- Medical school
- Board certified in hematology
- Board certified in internal medicine
- Board certified in medical oncology
Source: Dmand AI Professional Profile Data
Dr. Philip L. Chatham accepts plans from 3 insurance carriers
Dr. Chatham is in network with 3 carriers, including Blue Cross Blue Shield of Massachusetts, HCSC and Molina. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
Plan types Dr. Chatham accepts, by number of carriers
- Medicare3
- PPO2
- HMO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Philip L. Chatham's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Philip L. Chatham
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Philip L. Chatham's NPI number?
Dr. Philip L. Chatham's NPI number is 1740279264. It was assigned on October 18, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Philip L. Chatham?
Dr. Philip L. Chatham is a medical oncologist in Cerritos, California. The primary specialty in the NPI Registry is Medical Oncology Physician (taxonomy code 207RX0202X).
Where does Dr. Philip L. Chatham practice?
Dr. Chatham practices at 207 S Santa Anita St Ste P05 Suite P05, San Gabriel, CA 91776. Dr. Chatham also practices at 18000 Studebaker Rd, Cerritos, CA 90703. Dr. Chatham's primary practice is The Oncology Institute Ca - San Gabriel in San Gabriel, California. Dmand AI also links Dr. Chatham to 1 medical group.
What is Dr. Philip L. Chatham's office phone number?
The practice phone on file for Dr. Chatham is (626) 652-7433.
What is Dr. Philip L. Chatham's medical license number?
Dr. Chatham holds California license A32433.
Which hospitals is Dr. Philip L. Chatham affiliated with?
Dr. Chatham is affiliated with Providence Holy Cross Medical Center.
What medical group is Dr. Philip L. Chatham part of?
Dr. Chatham is linked to City of Hope. Dmand AI links Dr. Chatham to 1 more medical group.
Does Dr. Philip L. Chatham accept Medicare?
Yes. CMS data shows Dr. Chatham billed Medicare for 16 services in 2023.
Is Dr. Philip L. Chatham board certified?
Yes. Dr. Chatham is board certified in hematology by the American Board of Internal Medicine.
What services does Dr. Philip L. Chatham bill to Medicare?
In 2023, Dr. Chatham's most billed Medicare services were office visit, established patient (99214).
Show 5 more questionsShow fewer questions
Where did Dr. Philip L. Chatham go to medical school?
Dr. Chatham graduated from University of Kerala Medical College in 1969.
What drugs does Dr. Philip L. Chatham prescribe most?
In 2023 Medicare Part D data, Dr. Chatham's most prescribed drugs by claims were Anastrozole and Letrozole.
Has Dr. Philip L. Chatham received payments from drug or device companies?
CMS Open Payments shows $6,695 in general payments to Dr. Chatham from 49 companies from 2016 to 2023. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. Philip L. Chatham been practicing?
Dr. Chatham graduated from medical school in 1969, 57 years ago.
What insurance does Dr. Philip L. Chatham accept?
Dr. Chatham is in network with 3 carriers, including Blue Cross Blue Shield of Massachusetts, HCSC and Molina. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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