Quick answers
- Which hospitals does Sergio Castillo work at?
- Medicare's official clinician data lists Sergio Castillo at 5 hospitals: Covenant Hospital Levelland, Flambeau Hospital, Lawrence County Memorial Hospital, Lower Keys Medical Center and Marshfield Medical Center - Ladysmith. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sergio Castillo see patients?
- Medicare's clinician data lists 6 practice locations, including Marshfield, WI, Wisconsin Rapids, WI and Bonham, TX. Call before your visit to confirm the address.
- What is Sergio Castillo's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Sergio Castillo accept Medicare assignment?
- Yes. Medicare's clinician data says Sergio Castillo accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Sergio Castillo?
- (715) 387-5511, as listed in official Medicare / NPI Registry data.
- What is Sergio Castillo's NPI number?
- 1114906468. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sergio Castillo works
Medicare's Facility Affiliation Data lists Sergio Castillo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Covenant Hospital LevellandLevelland, TX · Acute Care Hospital · CCN 450755
- Flambeau HospitalPark Falls, WI · Critical Access Hospital · CCN 521325
- Lawrence County Memorial HospitalLawrenceville, IL · Critical Access Hospital · CCN 141344
- Lower Keys Medical CenterKey West, FL · Acute Care Hospital · CCN 100150
- Marshfield Medical Center - LadysmithLadysmith, WI · Critical Access Hospital · CCN 521328
Practice locations
Addresses where Sergio Castillo is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1000 N Oak AveMarshfield, WI 54449 (715) 387‑5511
- 440 24th S, Suite 100Wisconsin Rapids, WI 54494 (715) 424‑8625
- 440 24th St SWisconsin Rapids, WI 54494 (715) 751‑6200
- 504 Lipscomb StBonham, TX 75418 (903) 583‑8585
- 517 N Main StAnna, IL 62906 (618) 833‑4511
Group practices
Medicare enrollment lists Sergio Castillo as a member of these groups (CMS data updated 2026-10-02).
- MCHS Hospitals Inc1,197 clinicians in the group
- Integritas Emergency Physician Services LLC40 clinicians in the group
- Hospitalist Medicine Physicians of Texas - Cypress PLLC27 clinicians in the group
- MD4ER LLC13 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Marshfield
Clinicians with the same Medicare primary specialty in Marshfield, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1996 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1114906468 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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