Quick answers
- Which hospitals does Markus K. Sonntag work at?
- Medicare's official clinician data lists Markus K. Sonntag at 4 hospitals: Ascension St Vincent's Clay County, Ascension St Vincent's Riverside, Baptist Health Medical Center - Jacksonville and Mayo Clinic. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Markus K. Sonntag see patients?
- Medicare's clinician data lists 1 practice location in Jacksonville, FL. Call before your visit to confirm the address.
- What is Markus K. Sonntag's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Markus K. Sonntag accept Medicare assignment?
- Yes. Medicare's clinician data says Markus K. Sonntag 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.
- Does Markus K. Sonntag offer telehealth?
- Medicare's clinician data says Markus K. Sonntag offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Markus K. Sonntag?
- (904) 953-2000, as listed in official Medicare / NPI Registry data.
- What is Markus K. Sonntag's NPI number?
- 1942216031. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Markus K. Sonntag works
Medicare's Facility Affiliation Data lists Markus K. Sonntag at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension St Vincent's Clay CountyMiddleburg, FL · Acute Care Hospital · CCN 100321
- Ascension St Vincent's RiversideJacksonville, FL · Acute Care Hospital · CCN 100040
- Baptist Health Medical Center - JacksonvilleJacksonville, FL · Acute Care Hospital · CCN 100088
- Mayo ClinicJacksonville, FL · Acute Care Hospital · CCN 100151
Practice locations
Addresses where Markus K. Sonntag is enrolled with Medicare (CMS data updated 2026-10-02).
- 4500 San Pablo Rd SJacksonville, FL 32224 (904) 953‑2000
Group practices
Medicare enrollment lists Markus K. Sonntag as a member of this group (CMS data updated 2026-10-02).
- Mayo Clinic Jacksonville1,615 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Jacksonville
Clinicians with the same Medicare primary specialty in Jacksonville, FL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Miami, Lm Miller School Of Medicine |
| Graduation year | 2001 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942216031 |
| 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