Quick answers
- Does Alyssa M. Warren accept Medicare assignment?
- Yes. Medicare's clinician data says Alyssa M. Warren 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.
- How many Medicare patients does Alyssa M. Warren see?
- In 2024, CMS data shows 27 Original Medicare patients and 154 services for Alyssa M. Warren. This counts Original Medicare only and measures volume, not quality.
- What is Alyssa M. Warren's NPI number?
- 1811422231. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Alyssa M. Warren, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 27 |
|---|---|
| Services billed to Medicare | 154 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 59 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)111 services
- Hospital discharge day management, more than 30 minutes (99239)14 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Depression75%
- Anxiety75%
- High cholesterol63%
- High blood pressure59%
Hospitals where Alyssa M. Warren works
Medicare's Facility Affiliation Data lists Alyssa M. Warren 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.
- Good Shepherd Medical CenterHermiston, OR · Critical Access Hospital · Emergency services: listed by Medicare · CCN 381325
Practice locations
Addresses where Alyssa M. Warren is enrolled with Medicare (CMS data updated October 2, 2026).
- 600 NW 11th StHermiston, OR 97838 (541) 667‑3400
- 600 NW 11th St, Suite E37Hermiston, OR 97838 (541) 667‑3400
Group practices
Medicare enrollment lists Alyssa M. Warren as a member of this group (CMS data updated October 2, 2026).
- Good Shepherd Health Care System136 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Oregon
Clinicians with the same Medicare primary specialty in Oregon — not a recommendation.
Other clinicians in Good Shepherd Health Care System
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Eastern Virginia Medical School |
| Graduation year | 2017 (9 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811422231 |
| 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
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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