Quick answers
- Does Holly M. Hagen accept Medicare assignment?
- Yes. Medicare's clinician data says Holly M. Hagen 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 Holly M. Hagen see?
- In 2024, CMS data shows 60 Original Medicare patients and 832 services for Holly M. Hagen. This counts Original Medicare only and measures volume, not quality.
- What is Holly M. Hagen's NPI number?
- 1932537545. 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 Holly M. Hagen, 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 | 60 |
|---|---|
| Services billed to Medicare | 832 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Administration of psychological or neuropsychological test by technician, each additional 30 minutes (96139)298 services
- Evaluation of neuropsychological test, each additional hour (96133)297 services
- Psychiatric diagnostic evaluation (90791)60 services
- Evaluation of neuropsychological test, first hour (96132)60 services
- Administration of psychological or neuropsychological test by technician, first 30 minutes (96138)60 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).
- High cholesterol75%
- Anxiety75%
- High blood pressure67%
- Arthritis45%
- Depression45%
- Alzheimer's disease or dementia40%
Practice locations
Addresses where Holly M. Hagen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1451 Merchant DrAlgonquin, IL 60102 (847) 469‑7537
- 17 W662 Butterfield Rd, Suite 302Oakbrook Terrace, IL 60181 (847) 469‑7537
Group practices
Medicare enrollment lists Holly M. Hagen as a member of this group (CMS data updated October 2, 2026).
- Thomson Memory Center LLC13 clinicians in the group
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Algonquin
Clinicians with the same Medicare primary specialty in Algonquin, IL — not a recommendation.
Other clinicians in Thomson Memory Center LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PSY |
|---|---|
| Graduation year | 2011 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1932537545 |
| 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