Quick answers
- Where does Gregory E. Petersen see patients?
- Medicare's clinician data lists 4 practice locations, including Chicago, IL. Call before your visit to confirm the address.
- What is Gregory E. Petersen's specialty?
- Medicare lists Clinical Psychologist as the primary specialty.
- Does Gregory E. Petersen accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory E. Petersen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Gregory E. Petersen offer telehealth?
- Medicare's clinician data says Gregory E. Petersen offers telehealth services. Ask the office which visits can be done by video or phone.
- What is Gregory E. Petersen's NPI number?
- 1275509804. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Gregory E. Petersen is enrolled with Medicare (CMS data updated 2026-10-02).
Group practices
Medicare enrollment lists Gregory E. Petersen as a member of this group (CMS data updated 2026-10-02).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Credential | CP |
|---|---|
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1275509804 |
| 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 2026-10-02, retrieved 2026-10-29
- 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