John Oneil Simmonds, M.D
Orthopaedic Surgery Physician · Los Angeles, CA
John Oneil Simmonds, M.D is an orthopaedic surgery physician with a practice address in Los Angeles, California, and NPI 1801195912, issued on Mar 15, 2011. Check the license (California A100364, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Oneil Simmonds
- Credential
- M.D
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- A100364 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11901 Santa Monica Blvd Ste 620, Los Angeles, CA 90025
- Phone
- (310) 614-2663
- Enumerated
- Mar 15, 2011
- Record last updated
- Feb 26, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120511000418); accepts Medicare assignment
- Medical or professional school
- Howard University College Of Medicine, 2001
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Verify John Oneil Simmonds in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A100364Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
48 Medicare Part D claims for 23 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 44% of claims.
Most prescribed
- Santyl14 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 95.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Harbor Comprehensive Health IncWilmington, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Oneil Simmonds among 2,276 orthopaedic surgery physician records in California
John Oneil Simmonds, M.D is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 75% of them.
- NPI issued2011 · 75% of these records are older, 23% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2001 · median 2003 among the 1,347 with a school on file
- Record last updated2021 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Los Angeles → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- John Kelly, M.D.Los Angeles, CA 900251699703959
- Jonathan Koenig, M.D.Los Angeles, CA 900251932542107
- Babak Samimi, M.D.Los Angeles, CA 900251912121377
- Stephen Torres, M.D.Los Angeles, CA 900251659502813
- Micah Adamson, MDLos Angeles, CA 900241013390533
- Richard Marafioti, M.D.Los Angeles, CA 900241528271590
- Ryan OuilletteLos Angeles, CA 900241760016000
- Stephen Schwartz, M.D.Los Angeles, CA 900241588799118
Common questions
What is John Oneil Simmonds, M.D's NPI number?
John Oneil Simmonds, M.D's National Provider Identifier (NPI) is 1801195912, issued on Mar 15, 2011. An NPI identifies a provider in billing; it is not a license.
Where is John Oneil Simmonds, M.D located?
The NPPES record lists a practice address at 11901 Santa Monica Blvd Ste 620, Los Angeles, CA, 90025. Phone: (310) 614-2663. Providers update this record themselves, so call before visiting.
How can I verify John Oneil Simmonds, M.D's license?
NPPES lists California license number A100364, 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 John Oneil Simmonds, M.D prescribe under Medicare Part D?
In 2024, John Oneil Simmonds, M.D had 48 Medicare Part D claims for 23 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
What is John Oneil Simmonds, M.D's MIPS final score?
The 2023 MIPS final score is 95.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.