1. Home
  2. Directory
  3. California
  4. Los Angeles
  5. Orthopaedic Surgery
  6. NPI Profile

THOMAS F DAY M.D.
NPI 1356565741
Orthopaedic Surgery in Los Angeles, CA

Active since April 13, 2007PECOS EnrolledAccepts Medicare Assignment
444 S SAN VICENTE BLVD STE 704, LOS ANGELES, CA 90048(310) 248-7300(310) 248-7390 Get Directions Write a Review

NPPES record last updated: November 29, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Thomas F Day M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

THOMAS F DAY M.D. (NPI 1356565741) is an individual orthopaedic surgery provider in Los Angeles, California, licensed in California (A99705) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS and is a graduate of Jefferson Medical College Of Thomas Jefferson University (2005).

NPPES Registry Identity

NPI1356565741
Entity TypeIndividualMale
Primary Taxonomy207X00000X
Provider Legal NameTHOMAS F DAYCredential: M.D.
Location Address444 S SAN VICENTE BLVD STE 704Los Angeles, CA 90048-4169
Mailing Address444 S San Vicente Blvd Ste 704Los Angeles, CA 90048-4169 · (310) 248-7300 · Fax (310) 248-7390
Phone(310) 248-7300
Fax(310) 248-7390
Sole ProprietorNo
Medical School CMSJefferson Medical College Of Thomas Jefferson UniversityGraduated 2005
Enumeration DateApril 13, 2007
Last NPPES UpdateNovember 29, 2021
✔ NPI 1356565741 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207X00000X
License✔ Licensed in CA · A99705
Definition
An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.
444 S SAN VICENTE BLVD STE 704, Los Angeles, CA 90048
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Thomas F Day M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2567510944
PECOS Enrollment IDI20090423000748
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Thomas Day reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
2.2 mi
Health Maintenance Organization
6041 CADILLAC AVE
Los Angeles, CA 90034
  • Reassigned Medicare billing, California enrollment
  • 13,921 clinicians in this Medicare group
NPI 1043242563 (323) 857-2000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90048 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Thomas Day's NPI number?

The NPI number for Thomas Day is 1356565741. It was assigned to this individual provider in the NPPES registry on April 13, 2007.

Where is Thomas Day located?

Thomas Day practices at 444 S San Vicente Blvd Ste 704, Los Angeles, CA 90048. The listed phone number is (310) 248-7300.

What is Thomas Day's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Is Thomas Day enrolled in Medicare?

Yes. Thomas Day is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Thomas Day's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Day reassigns Medicare benefits to Southern California Permanente Medical Group (Los Angeles, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Thomas Day's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Thomas Day was last updated on November 29, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.