Diane Flessas, M.D.
Hospice and Palliative Medicine (Internal Medicine) Physician · Monrovia, CA
Diane Flessas, M.D. is a hospice and palliative medicine (internal medicine) physician with a practice address in Monrovia, California, and NPI 1164639753, issued on May 16, 2007. Check the license (California G064595, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Diane Flessas
- Credential
- M.D.
- Primary taxonomy
- Hospice and Palliative Medicine (Internal Medicine) Physician 207RH0002X
- License number
- G064595 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1107 Starlit LN, Monrovia, CA 91016
- Phone
- (626) 818-5959
- Enumerated
- May 16, 2007
- Record last updated
- May 8, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest hospice and palliative medicine (internal medicine) physician records → All 260 in California → Look up another NPI →
Verify Diane Flessas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G064595Check 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 hospice and palliative medicine (internal medicine) physician in 2024
14 Medicare Part D claims, against an average of 741 among the 1,607 providers of this specialty who prescribed in Part D.
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.
Diane Flessas among 260 hospice and palliative medicine (internal medicine) physician records in California
Diane Flessas, M.D. is one of 260 hospice and palliative medicine (internal medicine) physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 25% of them.
- NPI issued2007 · 25% of these records are older, 63% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2014 · 38% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0002X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospice and Palliative Medicine (Internal Medicine) Physician providers in California
There are 260 hospice and palliative medicine (internal medicine) physician records in California.
All 260 in California → Every provider in Monrovia → Hospice and Palliative Medicine (Internal Medicine) Physician nationwide →
The 8 hospice and palliative medicine (internal medicine) physician records with the nearest ZIP codes
- Chandana Banerjee, MDDuarte, CA 910101609168277
- Heather Bitar, D.O.Duarte, CA 910101326453663
- Sorin Buga, M.D.Duarte, CA 910101225250236
- William Dale, M.D., PH.D.Duarte, CA 910101518978295
- Christine Glaser, MDDuarte, CA 910101497017875
- Christine Jun, M.D.Duarte, CA 910101528298031
- Navneet Kaur, M.D.Duarte, CA 910101467862995
- Eric Mecusker, D.O.Duarte, CA 910101851747620
Common questions
What is Diane Flessas, M.D.'s NPI number?
Diane Flessas, M.D.'s National Provider Identifier (NPI) is 1164639753, issued on May 16, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Diane Flessas, M.D. located?
The NPPES record lists a practice address at 1107 Starlit LN, Monrovia, CA, 91016. Phone: (626) 818-5959. Providers update this record themselves, so call before visiting.
How can I verify Diane Flessas, M.D.'s license?
NPPES lists California license number G064595, 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 Diane Flessas, M.D. prescribe under Medicare Part D?
In 2024, Diane Flessas, M.D. had 14 Medicare Part D claims; the average among hospice and palliative medicine (internal medicine) physician prescribers was 741. 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.