Margaret Siegfried, ARNP
NPI 1164752655 · Acute Care Nurse Practitioner · Seattle, WA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Siegfried, ARNP is a Acute Care Nurse Practitioner provider in Seattle, WA (NPI 1164752655).
Provider details
- NPI number
- 1164752655
- Entity type
- Individual
- Primary specialty
- Acute Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- ARNP
- Sex
- Female
- Sole proprietor
- No
- License
- AP60106317 (WA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
266 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 164 | $133 |
| 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'SG2211 | 102 | $15 |
Typical Medicare-allowed amounts for these services range $15–$133 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 34 | 15 |
| Losartan Potassium | 34 | 14 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 23 | — |
| Prednisone | 22 | 11 |
| Famotidine | 21 | — |
| Carvedilol | 19 | — |
| Valganciclovir Hcl | 12 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-01-05
- Last updated
- 2010-01-05
Frequently asked questions
- What is Margaret Siegfried's NPI number?
- Margaret Siegfried's National Provider Identifier (NPI) is 1164752655, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Siegfried's specialty?
- Margaret Siegfried is listed in the NPPES registry with a primary specialty of Acute Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Margaret Siegfried located?
- Margaret Siegfried's practice location on file with NPPES is 1101 Madison St, Seattle, WA 98104-1306.
- What is Margaret Siegfried's phone number?
- The practice phone number listed in the NPPES registry for Margaret Siegfried is (206) 386-3660.
- Does Margaret Siegfried accept Medicare?
- Margaret Siegfried is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Siegfried's NPI active?
- Yes — Margaret Siegfried's NPI (1164752655) is active in the NPPES registry as of the last update on 2010-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.