Quick answers
- Which hospitals does Mark Ryan work at?
- Medicare's official clinician data lists Mark Ryan at 1 hospital: Tidalhealth Nanticoke, Inc.. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Ryan see patients?
- Medicare's clinician data lists 1 practice location in Seaford, DE. Call before your visit to confirm the address.
- What is Mark Ryan's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Mark Ryan accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Ryan 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 Mark Ryan's NPI number?
- 1669447637. 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 Ryan works
Medicare's Facility Affiliation Data lists Mark Ryan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Tidalhealth Nanticoke, Inc.Seaford, DE · Acute Care Hospital · CCN 080006
Practice locations
Addresses where Mark Ryan is enrolled with Medicare (CMS data updated 2026-10-02).
- 801 Middleford RdSeaford, DE 19973
Group practices
Medicare enrollment lists Mark Ryan as a member of this group (CMS data updated 2026-10-02).
- Tidalhealth Physician Network, Inc.117 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Seaford
Clinicians with the same Medicare primary specialty in Seaford, DE — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669447637 |
| 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