Quick answers
- Does De-Ann R. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says De-Ann R. Williams 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 De-Ann R. Williams see?
- In 2024, CMS data shows 232 Original Medicare patients and 899 services for De-Ann R. Williams. This counts Original Medicare only and measures volume, not quality.
- What is De-Ann R. Williams's NPI number?
- 1699114843. 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 De-Ann R. Williams, 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 | 232 |
|---|---|
| Services billed to Medicare | 899 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
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)392 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)278 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)154 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)34 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)17 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).
- Arthritis75%
- High blood pressure68%
- High cholesterol67%
- Osteoporosis27%
- Diabetes23%
- Chronic kidney disease23%
Hospitals where De-Ann R. Williams works
Medicare's Facility Affiliation Data lists De-Ann R. Williams 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.
- Astria Sunnyside HospitalSunnyside, WA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 501330
- Kittitas Valley Community HospitalEllensburg, WA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 501333
- Yakima Valley MemorialYakima, WA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: not listed by Medicare · CCN 500036
Practice locations
Addresses where De-Ann R. Williams is enrolled with Medicare (CMS data updated October 2, 2026).
- 1470 N 16th Ave, Suite DYakima, WA 98902 (509) 574‑6000
- 2811 Tieton DrYakima, WA 98902 (509) 575‑8000
Group practices
Medicare enrollment lists De-Ann R. Williams as a member of this group (CMS data updated October 2, 2026).
- Yakima Valley Memorial Physicians391 clinicians in the group
Specialties
- Internal Medicineprimary
- Rheumatologyalso
Other internal medicine doctors in Yakima
Clinicians with the same Medicare primary specialty in Yakima, WA — not a recommendation.
Other clinicians in Yakima Valley Memorial Physicians
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2007 (19 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1699114843 |
| 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