Mark J. Adler
Hematology & Oncology Physician · Vista, CA
Mark J. Adler is a hematology & oncology physician with a practice address in Vista, California, and NPI 1174552533, issued on Jun 30, 2006. Check the license (California G58922, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark J. Adler
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- G58922 CA
Self-reported in NPPES; status is on the state search - Practice location
- 910 Sycamore Ave, Vista, CA 92081
- Phone
- (760) 598-1700
- Enumerated
- Jun 30, 2006
- Record last updated
- Apr 30, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (760) 598-1196
- Medicaid ID
- 00G589220 CA
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 910 Sycamore Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Carolyn ButlerPrimary Care Nurse Practitioner1801889506
- Derek Helton, M.D.Hematology & Oncology Physician1801992839
- Stuart Kipper, M.D.Internal Medicine Physician1114956570
- Chris LewisPhysician Assistant1407883127
- Rupa Subramanian, M.D.Hematology & Oncology Physician1376547174
- Josephine Sutera, R.N.Oncology Registered Nurse1669671293
Verify Mark J. Adler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G58922Check 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 hematology & oncology physician in 2024
14 Medicare Part D claims, against an average of 877 among the 10,784 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.
Mark J. Adler among 1,583 hematology & oncology physician records in California
Mark J. Adler 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 updated2008 · 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 Vista → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Derek Helton, M.D.Vista, CA 920811801992839
- Rupa Subramanian, M.D.Vista, CA 920811376547174
- Sujatha Murali, MDSan Marcos, CA 920781366478661
- Rafael Bejar, M.D., PH.D.La Jolla, CA 920931720051493
- Sarah Boles, M.D.La Jolla, CA 920931245391242
- Imawati Budihardjo, M.D., PH.DLa Jolla, CA 920931043337173
- Srila Gopal, M.D.La Jolla, CA 920931831323369
- Ayad Hamdan, M.D.La Jolla, CA 920931144431230
Common questions
What is Mark J. Adler's NPI number?
Mark J. Adler's National Provider Identifier (NPI) is 1174552533, issued on Jun 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark J. Adler located?
The NPPES record lists a practice address at 910 Sycamore Ave, Vista, CA, 92081. Phone: (760) 598-1700. Providers update this record themselves, so call before visiting.
How can I verify Mark J. Adler's license?
NPPES lists California license number G58922, 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 Mark J. Adler prescribe under Medicare Part D?
In 2024, Mark J. Adler had 14 Medicare Part D claims; 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.