Sean Mickelsen, PA-C
NPI 1538839246 · Physician Assistant · Los Alamitos, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean Mickelsen, PA-C is a Physician Assistant provider in Los Alamitos, CA (NPI 1538839246).
Provider details
- NPI number
- 1538839246
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 60053 (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 tenure25% of score
4 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
254 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 136 | $84 |
| Complete Ultrasound Study of Arm and Leg Arteries93923 | 46 | $126 |
| Testing of Autonomic (sympathetic) Nervous System Function95923 | 43 | $117 |
| Insertion of Cage Or Mesh Device to Spine Bone and Disc Space During Spine Fusion22853 | 15 | $35 |
| Placement of Stabilizing Device to Front, 2-3 Spine Bone Segments22845 | 14 | $99 |
Typical Medicare-allowed amounts for these services range $35–$126 (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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$452 across 12 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-09-14
- Last updated
- 2022-12-20
- Certified
- 2021-11-07
Frequently asked questions
- What is Sean Mickelsen's NPI number?
- Sean Mickelsen's National Provider Identifier (NPI) is 1538839246, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean Mickelsen's specialty?
- Sean Mickelsen is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Sean Mickelsen located?
- Sean Mickelsen's practice location on file with NPPES is 3851 Katella Ave Ste 255, Los Alamitos, CA 90720-3353.
- What is Sean Mickelsen's phone number?
- The practice phone number listed in the NPPES registry for Sean Mickelsen is (562) 732-4578.
- Does Sean Mickelsen accept Medicare?
- Sean Mickelsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sean Mickelsen's NPI active?
- Yes — Sean Mickelsen's NPI (1538839246) is active in the NPPES registry as of the last update on 2022-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.