Quick answers
- Where does Mark D. Alter see patients?
- Medicare's clinician data lists 9 practice locations, including Mount Vernon, IL, Virginia Beach, VA and Ardmore, PA. Call before your visit to confirm the address.
- What is Mark D. Alter's specialty?
- Medicare lists Psychiatry as the primary specialty.
- Does Mark D. Alter accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Alter 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 Mark D. Alter offer telehealth?
- Medicare's clinician data says Mark D. Alter offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark D. Alter?
- (557) 203-1601, as listed in official Medicare / NPI Registry data.
- What is Mark D. Alter's NPI number?
- 1730263617. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mark D. Alter is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 9; the Medicare profile lists all.
- 1 Good Samaritan WayMount Vernon, IL 62864 · Good Samaritan Regional Health Center (557) 203‑1601
- 1080 1st Colonial Rd, Suite 403Virginia Beach, VA 23454 (757) 395‑1850
- 131 Valley RdArdmore, PA 19003 (757) 395‑1850
- 1500 Lansdowne AveDarby, PA 19023 (610) 237‑4210
- 4650 Lincoln BlvdMarina Del Rey, CA 90292 (310) 823‑8911
Group practices
Medicare enrollment lists Mark D. Alter as a member of these groups (CMS data updated 2026-10-02).
- Cedars-Sinai Medical Care Foundation1,692 clinicians in the group
- Sentara Medical Group1,408 clinicians in the group
- Cedars-Sinai Medical Center799 clinicians in the group
- University of Maryland Community Medical Group Inc477 clinicians in the group
- Bayhealth Medical Center, Inc413 clinicians in the group
- Trinity Health Mid-Atlantic Medical Group334 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Mount Vernon
Clinicians with the same Medicare primary specialty in Mount Vernon, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Pittsburgh School Of Medicine |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1730263617 |
| 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
- 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