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SIERRA A. MASTRANTONIO MD
NPI 1083290522
Anesthesiology in Salt Lake City, UT

Active since March 23, 2021PECOS EnrolledAccepts Medicare Assignment
30 N 1900 E RM 3C444, SALT LAKE CITY, UT 84132(801) 581-3622 Get Directions Write a Review

NPPES record last updated: December 26, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 26, 2025, Aug 30, 2022, Mar 23, 2021 (3 updates tracked since 2021).

About Sierra A. Mastrantonio Md NPPES

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

SIERRA A. MASTRANTONIO MD (NPI 1083290522) is an individual anesthesiology provider in Salt Lake City, Utah, licensed in Utah (13007559-1205) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS, is affiliated with University Of Utah Hospitals And Clinics, and is a graduate of University Of Nevada, Las Vegas School Of Medicine (2021).

NPPES Registry Identity

NPI1083290522
Entity TypeIndividualFemale
Primary Taxonomy207L00000X
Provider Legal NameSIERRA A. MASTRANTONIOCredential: MD
Location Address30 N 1900 E RM 3C444Salt Lake City, UT 84132-0002
Mailing Address30 N 1900 E Rm 3c444Salt Lake City, UT 84132-0002 · (801) 581-3622
Phone(801) 581-3622
Sole ProprietorNo
Medical School CMSUniversity Of Nevada, Las Vegas School Of MedicineGraduated 2021
Enumeration DateMarch 23, 2021
Last NPPES UpdateDecember 26, 20253 updates tracked since enumeration
NPPES CertifiedDecember 26, 2025
✔ NPI 1083290522 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in UT · 13007559-1205
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
30 N 1900 E RM 3C444, Salt Lake City, UT 84132
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Other Names 1

Former Name (1)Sierra Alexis Kreamer-hope

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

Sierra A. Mastrantonio 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 ID1951704394
PECOS Enrollment IDI20250711003029
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 Reassignments

2

Medicare enrollment records show Sierra Mastrantonio reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Of Utah Adult Services
0.1 mi
Anesthesiology
30 N 1900 E, 3C 444
Salt Lake City, UT 84132
  • Reassigned Medicare billing, Utah enrollment
  • 2,620 clinicians in this Medicare group
NPI 1720482599 (801) 587-6336
University Of Utah Acuity Care Services
0.1 mi
Critical Care Medicine
50 N MEDICAL DR
Salt Lake City, UT 84132
  • Reassigned Medicare billing, Utah enrollment
  • 338 clinicians in this Medicare group
NPI 1407250541 (801) 581-2121

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

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

University Of Utah Hospitals And Clinics

Acute Care Hospitals · Salt Lake City, UT
5/5 CMS rating
OwnershipGovernment - State
CMS Certification Number460009
Location50 North Medical DriveSalt Lake City, UT 84132 · Salt Lake County
Emergency services Birthing friendly

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.

AARON SMITH MD
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 581-3622
DR. KATHERINE LEIGH KONIUCH M.D.
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 581-6393
RYAN C. GRAHAM MD
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 581-3622
AARON J. ROSENBAUM MD
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 581-3622
ZACHARY A. LEE M.D.
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 587-1771
JACK A. DUBUQUE MD
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 581-3622
LINNEA E. DIXSON MD
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 581-6393
DR. JACOB B. HATCH MD
Anesthesiology
30 N 1900 E RM 3C444
SALT LAKE CITY, UT 84132
Salt Lake County (801) 581-6393

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 Sierra Mastrantonio's NPI number?

The NPI number for Sierra Mastrantonio is 1083290522. It was assigned to this individual provider in the NPPES registry on March 23, 2021. The provider is also known as Sierra Alexis Kreamer-Hope.

Where is Sierra Mastrantonio located?

Sierra Mastrantonio practices at 30 N 1900 E Rm 3c444, Salt Lake City, UT 84132. The listed phone number is (801) 581-3622.

What is Sierra Mastrantonio's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Sierra Mastrantonio enrolled in Medicare?

Yes. Sierra Mastrantonio 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 organizations bill Medicare for Sierra Mastrantonio's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sierra Mastrantonio reassigns Medicare benefits to 2 organizations: University Of Utah Adult Services (Salt Lake City, UT) and University Of Utah Acuity Care Services (Salt Lake City, UT). Each 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 Sierra Mastrantonio's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Sierra Mastrantonio affiliated with any hospitals?

According to CMS data, Sierra Mastrantonio is affiliated with University Of Utah Hospitals And Clinics.

When was this NPI record last updated?

The NPPES record for Sierra Mastrantonio was last updated on December 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.