Thomas F. Day, M.D.
Orthopaedic Surgery Physician · Los Angeles, CA
Thomas F. Day, M.D. is an orthopaedic surgery physician with a practice address in Los Angeles, California, and NPI 1356565741, issued on Apr 13, 2007. Check the license (California A99705, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas F. Day
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- A99705 CA
Self-reported in NPPES; status is on the state search - Practice location
- 444 S San Vicente Blvd Ste 704, Los Angeles, CA 90048
- Phone
- (310) 248-7300
- Enumerated
- Apr 13, 2007
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (310) 248-7390
- Medicare enrollment
- Enrolled (PECOS I20090423000748); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 2005
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Verify Thomas F. Day in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A99705Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
36 Medicare Part D claims for 20 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 14 claims were for opioids.
Most prescribed
- Gabapentin14 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupDowney, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas F. Day among 2,276 orthopaedic surgery physician records in California
Thomas F. Day, 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 2007, is newer than 54% of them.
- NPI issued2007 · 54% of these records are older, 35% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2005 · 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
- Sonu Ahluwalia, M.D.Los Angeles, CA 900481952459513
- Earl BrienLos Angeles, CA 900481518024702
- Rodney Gabriel, M.D.Los Angeles, CA 900481578631032
- Jon Greenfield, M.D.Los Angeles, CA 900481487644118
- Joseph Isaacson, MDLos Angeles, CA 900481912079955
- Charles Moon, M.D.Los Angeles, CA 900481376527440
- Michael Pearl, MDLos Angeles, CA 900481588731319
- Ramin Rabbani, MDLos Angeles, CA 900481306926340
Common questions
What is Thomas F. Day, M.D.'s NPI number?
Thomas F. Day, M.D.'s National Provider Identifier (NPI) is 1356565741, issued on Apr 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thomas F. Day, M.D. located?
The NPPES record lists a practice address at 444 S San Vicente Blvd Ste 704, Los Angeles, CA, 90048. Phone: (310) 248-7300. Providers update this record themselves, so call before visiting.
How can I verify Thomas F. Day, M.D.'s license?
NPPES lists California license number A99705, 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 Thomas F. Day, M.D. prescribe under Medicare Part D?
In 2024, Thomas F. Day, M.D. had 36 Medicare Part D claims for 20 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. 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.