Table 1.

Distribution of Behavioral Health Practices by Size: Number of Credentialed Primary Care Physicians (A), Behavioral Health Clinicians (B), Psychiatrists (C)^a

A. Practice Size with Given Number of Primary Care Physicians	Number of Primary Care Practices (%)	Number of Primary Care Providers (%)
Single Independent Primary Care Physician^b	165,063 (86.1%)	165,063 (46.9%)
Single Primary Care Physician Registered as Group^b	5,833 (3.0%)	5,833 (1.7%)
Group Practice with 2-3 Physicians	6,457 (3.4%)	12,584 (3.6%)
Group Practice with 4-10 Physicians	7,492 (3.9%)	25,253 (7.2%)
Group Practice with 11-20 Physicians	2,918 (1.5%)	18,422 (5.2%)
Group Practice with 21-100 Physicians	3,152 (1.6%)	47,554 (13.6%)
Group Practice with >100 Physicians	905 (0.5%)	75,641 (21.6%)
Total Number of Practices	191,820 (100.0%)	350,350 (100.0%)

B. Practice Size with Given Number of Behavioral Health Providers	Number of Behavioral Health Practices (%)	Number of Behavioral Health Providers (%)
Single Independent Behavioral Health Provider^b	108,813 (93.3%)	108,813 (74.17)
Single Behavioral Health Provider Registered as Group^b	1,596 (1.4%)	1,596(1.1%)
Group Practice with 2-3 Providers	1,440 (1.2%)	2,813(1.9%)
Group Practice with 4-10 Providers	2,071 (1.8%)	6,157 (4.2%)
Group Practice with 11-20 Providers	1,248 (1.1%)	6,536 (4.5%)
Group Practice with 21-100 Providers	1,358 (1.2%)	13,820 (9.5%)
Group Practice with >100 Providers	146 (0.1%)	5,970 (4.1%)
Total # of Practices	116,672 (100.0%)	146,992 (100.0%)

C. Practice Size with Given Number of Psychiatrists	Number of Psychiatrist Practices (%)	Number of Psychiatrists (%)
Single Independent Psychiatrist^b	20,318 (84.1%)	20,318 (45.7%)
Single Psychiatrist Registered as Group^b	1,250 (5.2%)	1,250 (2.8%)
Group Practice with 2-3 Psychiatrists	967 (4.0%)	4,428 (10.0%)
Group Practice with 4-10 Psychiatrists	1,029 (4.3%)	6,875 (15.4%)
Group Practice with 11-20 Psychiatrists	380 (1.6%)	5,089(11.4%)
Group Practice with 21-100 Psychiatrists	214 (0.9%)	5,645(12.7%)
Group Practice with >100 Psychiatrists	14 (0.1%)	894(2.0%)
Total Number of Practices	24,172 (100.0%)	44,449 (100.0%)

Based on analysis of 350,350 primary care physicians (including internal medicine, family practice, and pediatrics), 146,992 Aetna participating and non-participating behavioral health providers (psychiatrists plus non-psychiatrist therapists), and 44,449 psychiatrists, who filed a claim with Aetna in 2009; unique providers may be represented under more than one practice.

Individual providers could register with Aetna either as an independent practitioner or as a group at their own discretion.