Gregory Sewell, M.S. CCC-SLP
NPI 1598996845 · Speech-Language Pathologist · Duarte, CA
Gregory Sewell, M.S. CCC-SLP is a Speech-Language Pathologist provider in Duarte, CA (NPI 1598996845).
Provider details
- NPI number
- 1598996845
- Entity type
- Individual
- Primary specialty
- Speech-Language PathologistSpeech, Language and Hearing Service Providers
- Credential
- M.S. CCC-SLP
- Sex
- Male
- Sole proprietor
- Yes
- License
- SP 9462 (CA)
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
16 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
- 2009-08-05
- Last updated
- 2015-01-19
Frequently asked questions
- What is Gregory Sewell's NPI number?
- Gregory Sewell's National Provider Identifier (NPI) is 1598996845, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Sewell's specialty?
- Gregory Sewell is listed in the NPPES registry with a primary specialty of Speech-Language Pathologist (Speech, Language and Hearing Service Providers).
- Where is Gregory Sewell located?
- Gregory Sewell's practice location on file with NPPES is 531 Larkhall Ave, Duarte, CA 91010-1512.
- What is Gregory Sewell's phone number?
- The practice phone number listed in the NPPES registry for Gregory Sewell is (626) 840-6139.
- Is Gregory Sewell's NPI active?
- Yes — Gregory Sewell's NPI (1598996845) is active in the NPPES registry as of the last update on 2015-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.