Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mr. Mark D Ridderhoff, LCSW-C

Individual provider Clinical Social Worker · NPI 1437491420

Mr. Mark D Ridderhoff, LCSW-C is a Clinical Social Worker in Baltimore, Maryland. Qualified in 2005, 21 years ago. Practices with Congruent Counseling Services LLC, a 10-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Maryland.

Years since qualifying
21
Licensed in
MD
In the registry since
2013
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Practice location Address checks out

2050 Fountain St
Baltimore, MD 21231-3029 Not confirmed with CMS for 10 years — call before visiting
Phone: (443) 980-0019
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 15927 (MD)

Record details

NPI number1437491420
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW-C
Sole proprietorYes
NPI enumeratedMarch 18, 2013
Last updated in NPPESMarch 29, 2016

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Group practice Congruent Counseling Services Llc — 10 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients13
Services billed 107 a service is one billed item, such as a visit, a test or a procedure
Average patient age62

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Congruent Counseling Services LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Baltimore