Diane Johnston, RN FNP
NPI 1659532430 · Family Nurse Practitioner · San Marcos, TX
Diane Johnston, RN FNP is a Family Nurse Practitioner provider in San Marcos, TX (NPI 1659532430).
Provider details
- NPI number
- 1659532430
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN FNP
- Sex
- Female
- Sole proprietor
- No
- License
- 681841 (TX)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing 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
- 2008-06-24
- Last updated
- 2013-05-20
Frequently asked questions
- What is Diane Johnston's NPI number?
- Diane Johnston's National Provider Identifier (NPI) is 1659532430, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Johnston's specialty?
- Diane Johnston is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Diane Johnston located?
- Diane Johnston's practice location on file with NPPES is 601 University Dr, San Marcos, TX 78666-4684.
- What is Diane Johnston's phone number?
- The practice phone number listed in the NPPES registry for Diane Johnston is (512) 245-2161.
- Is Diane Johnston's NPI active?
- Yes — Diane Johnston's NPI (1659532430) is active in the NPPES registry as of the last update on 2013-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.