Quick answers
- Does Tristan Retzlaff accept Medicare assignment?
- Yes. Medicare's clinician data says Tristan Retzlaff accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Tristan Retzlaff's NPI number?
- 1558142604. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Tristan Retzlaff works
Medicare's Facility Affiliation Data lists Tristan Retzlaff at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Billings Clinic HospitalBillings, MT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 270004
- Intermountain Health St Vincent Regional HospitalBillings, MT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 270049
Practice locations
Addresses where Tristan Retzlaff is enrolled with Medicare (CMS data updated October 2, 2026).
- 2800 10th Ave NBillings, MT 59101 (406) 657‑4000
- 2800 10th Ave N, Suite DBillings, MT 59101 (406) 238‑2500
- 801 N 29th StBillings, MT 59101 (406) 238‑2500
Group practices
Medicare enrollment lists Tristan Retzlaff as a member of this group (CMS data updated October 2, 2026).
- Billings Clinic Specialty Supplies and Services, LLC824 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Billings
Clinicians with the same Medicare primary specialty in Billings, MT — not a recommendation.
Other clinicians in Billings Clinic Specialty Supplies and Services, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558142604 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians