DR. WILLIAM ANDREW DAY MD
NPI 1235716440
Orthopaedic Surgery in Jackson, MS

Q: What is William Day's NPI number?

The NPI number for William Day is 1235716440. It was assigned to this individual provider in the NPPES registry on March 24, 2021.

Q: What is William Day's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for William Day was last updated on July 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.

Active since March 24, 2021PECOS EnrolledAccepts Medicare Assignment

1325 E FORTIFICATION ST, JACKSON, MS 39202(601) 354-4488(601) 351-5980 Get Directions Write a Review

NPPES record last updated: July 20, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 20, 2026, Jul 29, 2021, Mar 24, 2021 (3 updates tracked since 2021).

On this page

About Dr. William Andrew Day Md NPPES

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

DR. WILLIAM ANDREW DAY MD (NPI 1235716440) is an individual orthopaedic surgery provider in Jackson, Mississippi, licensed in Mississippi (36709) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS and is a graduate of University Of Mississippi School Of Medicine (2021).

NPPES Registry Identity

NPI1235716440

Entity TypeIndividualMale

Primary Taxonomy207X00000X

Provider Legal NameDR. WILLIAM ANDREW DAYCredential: MD

Location Address1325 E FORTIFICATION STJackson, MS 39202-2442

Mailing Address1325 E Fortification StJackson, MS 39202-2442 · (601) 354-4488 · Fax (601) 351-5980

Phone(601) 354-4488

Fax(601) 351-5980

Sole ProprietorNo

Medical School CMSUniversity Of Mississippi School Of MedicineGraduated 2021

Enumeration DateMarch 24, 2021

Last NPPES UpdateJuly 20, 20263 updates tracked since enumeration

NPPES CertifiedJuly 20, 2026

✔ NPI 1235716440 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code207X00000X

License✔ Licensed in MS · 36709

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.

1325 E FORTIFICATION ST, Jackson, MS 39202

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter Health and more.Insurance ›

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

Dr. William Andrew Day Md 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 ID2466976154

PECOS Enrollment IDI20260629002943

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 William Day reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Mississippi Sports Medicine & Orthopaedic Center

Same address

Orthopaedic Surgery

1325 E FORTIFICATION ST
Jackson, MS 39202

Reassigned Medicare billing, Mississippi enrollment
107 clinicians in this Medicare group

NPI 1568415560 (601) 949-9106

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 39202 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

$80.50 typical visit price

range $51.65 – $159.18

Typical copayment $20.12 (range $12.91 – $39.79)

Most-billed visit code 99203

Established Patient

$64.96 typical visit price

range $16.15 – $129.61

Typical copayment $16.24 (range $4.03 – $32.40)

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.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JOSH CAMPBELL HARDIN ATC/L

Specialist/Technologist (Athletic Trainer)