Mark Ridderhoff, LCSW-C
NPI 1437491420 · Clinical Social Worker · Baltimore, MD
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Ridderhoff, LCSW-C is a Clinical Social Worker provider in Baltimore, MD (NPI 1437491420).
Provider details
- NPI number
- 1437491420
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW-C
- Sex
- Male
- Sole proprietor
- Yes
- License
- 15927 (MD)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
13 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-03-18
- Last updated
- 2016-03-29
Frequently asked questions
- What is Mark Ridderhoff's NPI number?
- Mark Ridderhoff's National Provider Identifier (NPI) is 1437491420, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ridderhoff's specialty?
- Mark Ridderhoff is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Ridderhoff located?
- Mark Ridderhoff's practice location on file with NPPES is 2050 Fountain St, Baltimore, MD 21231-3029.
- What is Mark Ridderhoff's phone number?
- The practice phone number listed in the NPPES registry for Mark Ridderhoff is (443) 980-0019.
- Does Mark Ridderhoff accept Medicare?
- Mark Ridderhoff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Ridderhoff's NPI active?
- Yes — Mark Ridderhoff's NPI (1437491420) is active in the NPPES registry as of the last update on 2016-03-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.