Quick answers
- Where does Mark Ridderhoff see patients?
- Medicare's clinician data lists 3 practice locations, including Columbia, MD and Towson, MD. Call before your visit to confirm the address.
- What is Mark Ridderhoff's specialty?
- Medicare lists Clinical Social Worker as the primary specialty.
- Does Mark Ridderhoff accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Ridderhoff 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 Ridderhoff offer telehealth?
- Medicare's clinician data says Mark Ridderhoff offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark Ridderhoff?
- (410) 740-8066, as listed in official Medicare / NPI Registry data.
- What is Mark Ridderhoff's NPI number?
- 1437491420. 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 Ridderhoff is enrolled with Medicare (CMS data updated 2026-10-02).
- 10630 Little Patuxent Pkwy, Suite 209Columbia, MD 21044 (410) 740‑8066
- 110 E Pennsylvania AveTowson, MD 21286 (410) 583‑2222
- 110 E Pennsylvania Ave, TowsonTowson, MD 21286
Group practices
Medicare enrollment lists Mark Ridderhoff as a member of these groups (CMS data updated 2026-10-02).
- Congruent Counseling Services LLC11 clinicians in the group
- Fishel, Watson, and Lemaire PA5 clinicians in the group
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Columbia
Clinicians with the same Medicare primary specialty in Columbia, MD — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1437491420 |
| 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