Mark Horwitz, M.S., CCC-SLP
NPI 1154557346 · Speech-Language Pathologist · Philadelphia, PA
Mark Horwitz, M.S., CCC-SLP is a Speech-Language Pathologist provider in Philadelphia, PA (NPI 1154557346).
Provider details
- NPI number
- 1154557346
- Entity type
- Individual
- Primary specialty
- Speech-Language PathologistSpeech, Language and Hearing Service Providers
- Credential
- M.S., CCC-SLP
- Sex
- Male
- Sole proprietor
- No
- License
- SL 010720 (PA)
Specialties & taxonomies
Speech, Language and Hearing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 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
- 2009-06-02
- Last updated
- 2013-09-09
Frequently asked questions
- What is Mark Horwitz's NPI number?
- Mark Horwitz's National Provider Identifier (NPI) is 1154557346, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Horwitz's specialty?
- Mark Horwitz is listed in the NPPES registry with a primary specialty of Speech-Language Pathologist (Speech, Language and Hearing Service Providers).
- Where is Mark Horwitz located?
- Mark Horwitz's practice location on file with NPPES is 425 Glen Echo Rd, Philadelphia, PA 19119-2915.
- What is Mark Horwitz's phone number?
- The practice phone number listed in the NPPES registry for Mark Horwitz is (215) 500-6445.
- Is Mark Horwitz's NPI active?
- Yes — Mark Horwitz's NPI (1154557346) is active in the NPPES registry as of the last update on 2013-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.