Linda Trettin, PH.D.
NPI 1356669287 · Clinical Psychologist · Folsom, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Linda Trettin, PH.D. is a Clinical Psychologist provider in Folsom, CA (NPI 1356669287).
Provider details
- NPI number
- 1356669287
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- PSY23452 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
332 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Evaluation of Neuropsychological Test, Each Additional Hour96133 | 138 | $98 |
| Administration of Psychological Or Neuropsychological Test, Each Additional 30 Minutes96137 | 134 | $37 |
| Psychiatric Diagnostic Evaluation90791 | 20 | $174 |
| Evaluation of Neuropsychological Test, First Hour96132 | 20 | $129 |
| Administration of Psychological Or Neuropsychological Test, First 30 Minutes96136 | 20 | $41 |
Typical Medicare-allowed amounts for these services range $37–$174 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-05-17
- Last updated
- 2021-03-19
- Certified
- 2021-02-24
Frequently asked questions
- What is Linda Trettin's NPI number?
- Linda Trettin's National Provider Identifier (NPI) is 1356669287, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Linda Trettin's specialty?
- Linda Trettin is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Linda Trettin located?
- Linda Trettin's practice location on file with NPPES is 9580 Oak Avenue Pkwy Ste 7, Folsom, CA 95630-9997.
- What is Linda Trettin's phone number?
- The practice phone number listed in the NPPES registry for Linda Trettin is (916) 399-3961.
- Does Linda Trettin accept Medicare?
- Linda Trettin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Linda Trettin's NPI active?
- Yes — Linda Trettin's NPI (1356669287) is active in the NPPES registry as of the last update on 2021-03-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.