NPI registrations by year
New NPIs enumerated each year, with the cumulative total overlaid
Group size by NPIs
How many NPI registrations each group holds
Group size by sites
Physical locations per group, primary plus secondary
Group reach by states
Distinct states per group, counting both NPI locations and secondary sites
Registrations by month
Seasonality across every year in range. Even spread suggests organic openings; spikes suggest batch filings.
Top states by NPI registrations
Counted by practice location state on the NPI record
Multistate groups by first registration year
Groups spanning two or more states, placed by their earliest NPI registration
Largest groups
Ranked by site count. NPIs and sites diverge because some operators register one NPI per location while others list many locations under a single NPI.
Fastest expansions
Multistate groups ranked by states entered per year since their first registration. Only states with a dated NPI registration are counted, because NPPES does not record when a secondary location was added.