Mark Underwood, MA, CCC-SLP
NPI 1639512247 · Speech-Language Pathologist · Richland, WA
Mark Underwood, MA, CCC-SLP is a Speech-Language Pathologist provider in Richland, WA (NPI 1639512247).
Provider details
- NPI number
- 1639512247
- Entity type
- Individual
- Primary specialty
- Speech-Language PathologistSpeech, Language and Hearing Service Providers
- Credential
- MA, CCC-SLP
- Sex
- Male
- Sole proprietor
- Yes
- License
- LL60314859 (WA)
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
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
- 2013-04-12
- Last updated
- 2013-04-12
Frequently asked questions
- What is Mark Underwood's NPI number?
- Mark Underwood's National Provider Identifier (NPI) is 1639512247, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Underwood's specialty?
- Mark Underwood is listed in the NPPES registry with a primary specialty of Speech-Language Pathologist (Speech, Language and Hearing Service Providers).
- Where is Mark Underwood located?
- Mark Underwood's practice location on file with NPPES is 615 Snow Ave, Richland, WA 99352-3851.
- What is Mark Underwood's phone number?
- The practice phone number listed in the NPPES registry for Mark Underwood is (509) 967-6332.
- Is Mark Underwood's NPI active?
- Yes — Mark Underwood's NPI (1639512247) is active in the NPPES registry as of the last update on 2013-04-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.