Leo E. Orr, M.D.
Hematology & Oncology Physician · Los Angeles, CA
Leo E. Orr, M.D. is a hematology & oncology physician with a practice address in Los Angeles, California, and NPI 1730102286, issued on Jul 25, 2006. Check the license (California C35803, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Leo E. Orr
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- C35803 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1245 Wilshire Blvd, Los Angeles, CA 90017
- Phone
- (213) 481-3948
- Enumerated
- Jul 25, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (213) 481-1697
- Medicaid IDs
- 00C358031 CA
00C358030 CA - Medicare enrollment
- Enrolled (PECOS I20060110000819); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 1969
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 1245 Wilshire Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Leo E. Orr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C35803Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% more Medicare Part D claims than the average hematology & oncology physician in 2024
947 Medicare Part D claims for 143 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims. 62 claims were for opioids.
Most prescribed
- Letrozole83 claims
- Anastrozole50 claims
- Xtandi45 claims
- Prednisone39 claims
- Ibrance29 claims
- Verzenio29 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.
Industry payments in 2024: $3,868.64
167 payments; by number, the most common kind was food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. 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.
Bills Medicare through one group practice
- The Oncology Institute CA, A Professional CorporationMontebello, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leo E. Orr among 1,583 hematology & oncology physician records in California
Leo E. Orr, M.D. 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 fileYes · 71% of these records are
- Graduated1969 · median 2003 among the 1,124 with a school on file
- Record last updated2023 · 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 Los Angeles → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Aaron Burkenroad, MDLos Angeles, CA 900171619473667
- Ellsworth Grant, M.DLos Angeles, CA 900171043233760
- Jason Ho, M.D.Los Angeles, CA 900171174735658
- Seong Kim, MDLos Angeles, CA 900171316987605
- Sungwon Kyung, M.D.Los Angeles, CA 900171831501840
- Lasika Seneviratne, M.D.Los Angeles, CA 900171437268174
- Alexander Song, MDLos Angeles, CA 900171265964795
- Nenad Antic, MCLos Angeles, CA 900151346293883
Common questions
What is Leo E. Orr, M.D.'s NPI number?
Leo E. Orr, M.D.'s National Provider Identifier (NPI) is 1730102286, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Leo E. Orr, M.D. located?
The NPPES record lists a practice address at 1245 Wilshire Blvd, Los Angeles, CA, 90017. Phone: (213) 481-3948. Providers update this record themselves, so call before visiting.
How can I verify Leo E. Orr, M.D.'s license?
NPPES lists California license number C35803, 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 Leo E. Orr, M.D. prescribe under Medicare Part D?
In 2024, Leo E. Orr, M.D. had 947 Medicare Part D claims for 143 beneficiaries; 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.