Quick answers
- Does Darien S. Fenn accept Medicare assignment?
- Yes. Medicare's clinician data says Darien S. Fenn accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Darien S. Fenn see?
- In 2024, CMS data shows 20 Original Medicare patients and 286 services for Darien S. Fenn. This counts Original Medicare only and measures volume, not quality.
- What is Darien S. Fenn's NPI number?
- 1164550224. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Darien S. Fenn, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 20 |
|---|---|
| Services billed to Medicare | 286 |
| Different services or procedures | 4 |
| Participating Medicare provider | Yes |
| Average age of these patients | 66 |
Most frequent services
- Psychotherapy, 1 hour (90837)270 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Anxiety75%
- High cholesterol70%
- High blood pressure60%
Practice locations
Addresses where Darien S. Fenn is enrolled with Medicare (CMS data updated October 2, 2026).
- 23540 SW Gage RdWilsonville, OR 97070 (503) 673‑0135
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Oregon
Clinicians with the same Medicare primary specialty in Oregon — not a recommendation.
Clinician information
| Credential | CP |
|---|---|
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1164550224 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians