DEREK S. DAY MD
NPI 1972131712
Physical Medicine & Rehabilitation in Salt Lake City, UT
About Derek S. Day Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DEREK S. DAY MD (NPI 1972131712) is an individual physical medicine & rehabilitation provider in Salt Lake City, Utah, licensed in Utah (13877410-1205) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, is affiliated with Avera Mckennan Hospital & University Health Center, and maintains a secondary practice location in Washington.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted 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
Derek S. 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.
Medicare Billing Reassignment
Medicare enrollment records show Derek Day reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Pierre, SD 57501
- Reassigned Medicare billing, South Dakota enrollment
- 1,277 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Avera Mckennan Hospital & University Health Center
Acute Care Hospitals · Sioux Falls, SDAvera Dells Area Hospital - Cah
Critical Access Hospitals · Dell Rapids, SDOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SALT LAKE CITY, UT 84112
SALT LAKE CITY, UT 84112
SALT LAKE CITY, UT 84112
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 Derek Day's NPI number?
The NPI number for Derek Day is 1972131712. It was assigned to this individual provider in the NPPES registry on March 28, 2020.
Where is Derek Day located?
Derek Day practices at 85 N Medical Dr, Salt Lake City, UT 84112. The listed phone number is (801) 581-2121.
What is Derek Day's specialty?
The primary specialty registered for this NPI is Physical Medicine & Rehabilitation with taxonomy code 208100000X.
Is Derek Day enrolled in Medicare?
Yes. Derek 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 Derek Day's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Derek Day reassigns Medicare benefits to Avera Mckennan (Pierre, SD). 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 Derek Day's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Derek Day accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Sunflower Health Plan, Avera Health Plans and Molina Healthcare and 2 other insurers list Derek Day as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Derek Day affiliated with any hospitals?
According to CMS data, Derek Day is affiliated with Avera Mckennan Hospital & University Health Center and Avera Dells Area Hospital - Cah.
When was this NPI record last updated?
The NPPES record for Derek Day was last updated on March 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.