Mikael Siewert, P.A.
NPI 1366538647 · Physician Assistant · San Francisco, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mikael Siewert, P.A. is a Physician Assistant provider in San Francisco, CA (NPI 1366538647).
Provider details
- NPI number
- 1366538647
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- P.A.
- Sex
- Male
- Sole proprietor
- No
- License
- PA14838 (CA)
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 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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 170 | 140 |
| Ondansetronbrand: Ondansetron Odt | 165 | 153 |
| Celecoxib | 120 | 114 |
| Omeprazole | 113 | 109 |
| Amoxicillin | 92 | 72 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 47 | 39 |
| Cefadroxil | 40 | 39 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-05
- Last updated
- 2022-01-03
Frequently asked questions
- What is Mikael Siewert's NPI number?
- Mikael Siewert's National Provider Identifier (NPI) is 1366538647, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mikael Siewert's specialty?
- Mikael Siewert is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mikael Siewert located?
- Mikael Siewert's practice location on file with NPPES is 3838 California St, San Francisco, CA 94118-1522.
- What is Mikael Siewert's phone number?
- The practice phone number listed in the NPPES registry for Mikael Siewert is (415) 592-2014.
- Does Mikael Siewert accept Medicare?
- Mikael Siewert is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mikael Siewert's NPI active?
- Yes — Mikael Siewert's NPI (1366538647) is active in the NPPES registry as of the last update on 2022-01-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.