Mariann Williams, NP
NPI 1922166776 · Nurse Practitioner · Tonasket, WA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mariann Williams, NP is a Nurse Practitioner provider in Tonasket, WA (NPI 1922166776).
Provider details
- NPI number
- 1922166776
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- RN00056504 (WA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 28 | 11 |
| Omeprazole | 24 | — |
| Losartan Potassium | 20 | 12 |
| Apixabanbrand: Eliquis | 19 | — |
| Atorvastatin Calcium | 17 | — |
| Amlodipine Besylate | 17 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-05
- Last updated
- 2025-12-04
- Certified
- 2025-12-04
Frequently asked questions
- What is Mariann Williams's NPI number?
- Mariann Williams's National Provider Identifier (NPI) is 1922166776, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mariann Williams's specialty?
- Mariann Williams is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mariann Williams located?
- Mariann Williams's practice location on file with NPPES is 118 S Whitcomb Ave, Tonasket, WA 98855-9287.
- What is Mariann Williams's phone number?
- The practice phone number listed in the NPPES registry for Mariann Williams is (509) 486-3191.
- Does Mariann Williams accept Medicare?
- Mariann Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mariann Williams's NPI active?
- Yes — Mariann Williams's NPI (1922166776) is active in the NPPES registry as of the last update on 2025-12-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.