Uc Davis Medical Center · Referral network
HSA 5200 · 2014 · 1135 physicians · 8000 edges
Running from SQLite — no Neo4j required. Regional and HSA dashboards, this force graph, curvature histogram, and hub rankings all work out of the box. Advanced users can optionally load the graph into a self-hosted Neo4j instance (docker compose up -d, then npm run etl-to-neo4j) for the Cypher playground and Neo4j Browser.
Force-directed graph · edges coloured by Forman–Ricci curvature
Loading graph engine…
Curvature distribution
Mean F
-4,247,057
Median F
-352,078
Min F
-200,700,733
Max F
158
From referral_network_features
Precomputed on the full thresholded network (all edges, Python toolkit, unit node weights).
Nodes
1,439
Edges
21,571
Avg clustering
0.634
Density
0.0208
Forman μ
-115
Forman σ
156.3
Rendered graph structure
Live computation on up to 8,000 edges (SQLite row order, node-strength weights). Values will differ from precomputed stats above for large HSAs.
Total weight
520,841
Avg degree
14.10
Max degree
423
Negative F edges
7,957
Positive F edges
43
Nonzero F edges
8,000
Reading the graph
Teal edges have positive Forman curvature — efficient information flow.
Red edges have negative curvature — bottlenecks in the referral graph.
Edge width: log(patient count). Node size: degree-weighted strength.
Hub physicians
#1
NPI 1497827562
Degree 423 · weight 45,430
423
#2
NPI 1942282801
Degree 353 · weight 41,270
353
#3
NPI 1013921253
Degree 354 · weight 40,315
354
#4
NPI 1245289545
Degree 290 · weight 34,794
290
#5
NPI 1609857077
Degree 257 · weight 24,666
257
#6
NPI 1659450047
Degree 192 · weight 22,473
192
#7
NPI 1215955844
Degree 193 · weight 19,950
193
#8
NPI 1326029794
Degree 178 · weight 18,284
178
Most negative curvature
#1
Forman -200,700,733
1497827562 → 1942282801
Weight 1,828 · Forman -200,700,733
#2
Forman -192,262,094
1013921253 → 1497827562
Weight 1,687 · Forman -192,262,094
#3
Forman -172,009,690
1245289545 → 1497827562
Weight 1,771 · Forman -172,009,690
#4
Forman -160,938,406
1013921253 → 1942282801
Weight 1,678 · Forman -160,938,406
#5
Forman -137,350,095
1245289545 → 1942282801
Weight 1,696 · Forman -137,350,095
#6
Forman -137,215,716
1013921253 → 1245289545
Weight 1,706 · Forman -137,215,716
#7
Forman -121,177,355
1497827562 → 1609857077
Weight 1,094 · Forman -121,177,355
#8
Forman -110,876,425
1326029794 → 1497827562
Weight 1,216 · Forman -110,876,425
Strongest referral edges
#1
Weight 1,828
1497827562 → 1942282801
Weight 1,828 · Forman -200,700,733
#2
Weight 1,771
1245289545 → 1497827562
Weight 1,771 · Forman -172,009,690
#3
Weight 1,706
1013921253 → 1245289545
Weight 1,706 · Forman -137,215,716
#4
Weight 1,696
1245289545 → 1942282801
Weight 1,696 · Forman -137,350,095
#5
Weight 1,687
1013921253 → 1497827562
Weight 1,687 · Forman -192,262,094
#6
Weight 1,678
1013921253 → 1942282801
Weight 1,678 · Forman -160,938,406
#7
Weight 1,216
1326029794 → 1497827562
Weight 1,216 · Forman -110,876,425
#8
Weight 1,201
1245289545 → 1609857077
Weight 1,201 · Forman -79,882,485