Quick answers
- Does Mariya I. Alder accept Medicare assignment?
- Yes. Medicare's clinician data says Mariya I. Alder 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 Mariya I. Alder see?
- In 2024, CMS data shows 248 Original Medicare patients and 740 services for Mariya I. Alder. This counts Original Medicare only and measures volume, not quality.
- What is Mariya I. Alder's NPI number?
- 1518334465. 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 Mariya I. Alder, 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 | 248 |
|---|---|
| Services billed to Medicare | 740 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)252 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)155 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)82 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)79 services
- Telephone medical discussion with physician, 11-20 minutes (99442)47 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).
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- High cholesterol65%
- High blood pressure62%
- Arthritis49%
- Diabetes27%
- Osteoporosis26%
Hospitals where Mariya I. Alder works
Medicare's Facility Affiliation Data lists Mariya I. Alder 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.
- Oroville HospitalOroville, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050030
- Sierra Nevada Memorial HospitalGrass Valley, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050150
- University of California Davis Medical CenterSacramento, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050599
Practice locations
Addresses where Mariya I. Alder is enrolled with Medicare (CMS data updated October 2, 2026).
- 155 Glasson Way Bldg, 3 L 20Grass Valley, CA 95945 (530) 802‑6400
- 300 Sierra College Dr, Suite 150Grass Valley, CA 95945 (530) 274‑6600
- 4501 X StSacramento, CA 95817 (916) 734‑5959
- 4860 Y StSacramento, CA 95817
Group practices
Medicare enrollment lists Mariya I. Alder as a member of these groups (CMS data updated October 2, 2026).
- Regents of the Univ of Ca1,584 clinicians in the group
- Regents of the University of California567 clinicians in the group
- Grass Valley Radiation Oncology5 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Grass Valley
Clinicians with the same Medicare primary specialty in Grass Valley, CA — not a recommendation.
Other clinicians in Regents of the Univ of Ca
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1518334465 |
| 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