Quick answers
- Where does John P. Marker see patients?
- Medicare's clinician data lists 1 practice location in Greenwood, IN. Call before your visit to confirm the address.
- What is John P. Marker's specialty?
- Medicare lists Mental Health Counselor as the primary specialty.
- Does John P. Marker accept Medicare assignment?
- Medicare's clinician data says John P. Marker may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for John P. Marker?
- (317) 743-8202, as listed in official Medicare / NPI Registry data.
- What is John P. Marker's NPI number?
- 1629267786. 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 John P. Marker is enrolled with Medicare (CMS data updated 2026-10-02).
- 435 E Main St, Suite 200Greenwood, IN 46143 (317) 743‑8202
Group practices
Medicare enrollment lists John P. Marker as a member of this group (CMS data updated 2026-10-02).
- Generations Counseling Services, LLC5 clinicians in the group
Specialties
- Mental Health Counselorprimary
Other mental health counselors in Greenwood
Clinicians with the same Medicare primary specialty in Greenwood, IN — not a recommendation.
Clinician information
| Graduation year | 2004 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1629267786 |
| 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