Walt Mercer, PH.D.
NPI 1548457336 · Clinical Neuropsychologist · San Marcos, TX
Walt Mercer, PH.D. is a Clinical Neuropsychologist provider in San Marcos, TX (NPI 1548457336).
Provider details
- NPI number
- 1548457336
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 25814 (TX)
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
18 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
- 2007-09-26
- Last updated
- 2007-09-26
Frequently asked questions
- What is Walt Mercer's NPI number?
- Walt Mercer's National Provider Identifier (NPI) is 1548457336, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walt Mercer's specialty?
- Walt Mercer is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
- Where is Walt Mercer located?
- Walt Mercer's practice location on file with NPPES is 1341 Thorpe Ln, San Marcos, TX 78666-7113.
- What is Walt Mercer's phone number?
- The practice phone number listed in the NPPES registry for Walt Mercer is (512) 558-7770.
- Is Walt Mercer's NPI active?
- Yes — Walt Mercer's NPI (1548457336) is active in the NPPES registry as of the last update on 2007-09-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.