# Physical therapist groups by size, CMS Doctors and Clinicians file

Physical therapists (primary specialty "PHYSICAL THERAPIST IN PRIVATE PRACTICE") in the CMS Doctors and Clinicians National Downloadable File (fetched 15 September 2026), counted by distinct NPI per group brand.

## Files

- pt_groups_top25.csv: the 25 largest groups. Columns: rank, group (brand or legal name), physical_therapists, legal_entities (org PAC IDs), states, also_in_other_group (therapists who also bill through a group outside the brand), also_in_other_group_share (%).
- luna_by_state.csv: Luna therapists per practice state.
- facts.json: totals and the groups where Luna therapists most often also bill.

Built by tools/report_pt_chains_facts.py.