Quick answers
- Which hospitals does Mark Holder work at?
- Medicare's official clinician data lists Mark Holder at 1 hospital: Mercy Hospital St Louis. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Holder see patients?
- Medicare's clinician data lists 5 practice locations, including Glen Carbon, IL, Saint Charles, MO and Saint Louis, MO. Call before your visit to confirm the address.
- What is Mark Holder's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Mark Holder accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Holder 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 Mark Holder?
- (314) 205-3146, as listed in official Medicare / NPI Registry data.
- What is Mark Holder's NPI number?
- 1659988533. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Holder works
Medicare's Facility Affiliation Data lists Mark Holder at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
Practice locations
Addresses where Mark Holder is enrolled with Medicare (CMS data updated 2026-10-02).
- 17 Ginger Creek MdwsGlen Carbon, IL 62034 (314) 205‑3146
- 1820 Zumbehl Rd, Suite 120Saint Charles, MO 63303 (636) 947‑2334
- 211 N Lindbergh Blvd, Suite 100Saint Louis, MO 63141 (314) 205‑3146
- 2928 N Central StMaryville, IL 62062 (615) 505‑4107
- 5139 Mattis Rd, Suite 100Saint Louis, MO 63128 (314) 205‑6149
Group practices
Medicare enrollment lists Mark Holder as a member of these groups (CMS data updated 2026-10-02).
- Mercy Clinic East Communities571 clinicians in the group
- St Louis Pain Consultants LLC6 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659988533 |
| 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