Clinical Psychologist vs Intellectual & Developmental Disabilities Psychologist

Clinical Psychologist has 72.9 times as many registry records as Intellectual & Developmental Disabilities Psychologist: 69,391 against 952. Each count is the NPPES records whose primary taxonomy is the specialty, so it measures how providers describe their main practice, not everyone trained in it.

CMS NPPES, file of Aug 9, 2026; 2023 Census population estimates · method

Clinical Psychologist: 69,391 records in 56 states

California12,647
New York6,558
Illinois3,947
Massachusetts3,185
Florida2,980

Clinical Psychologist nationwide →

Intellectual & Developmental Disabilities Psychologist: 952 records in 46 states

Delaware159
Ohio91
California71
New York66
Florida56

Intellectual & Developmental Disabilities Psychologist nationwide →

By state, with records per 100,000 residents

State	Clinical Psychologist	Intellectual & Developmental Disabilities Psychologist	Per 100,000 (first)	Per 100,000 (second)
California	12,647	71	32.5	0.2
New York	6,558	66	33.5	0.3
Illinois	3,947	18	31.5	0.1
Massachusetts	3,185	25	45.5	0.4
Florida	2,980	56	13.2	0.2
Michigan	2,965	48	29.5	0.5
Texas	2,732	49	9.0	0.2
Pennsylvania	2,597	24	20.0	0.2
Virginia	2,329	15	26.9	0.2
North Carolina	1,712	42	15.8	0.4
Washington	1,675	5	21.4	0.1
Ohio	1,581	91	13.4	0.8
Colorado	1,652	17	28.1	0.3
Minnesota	1,538	29	26.8	0.5
New Jersey	1,513	26	16.3	0.3
Maryland	1,499	24	24.3	0.4
Georgia	1,169	20	10.6	0.2
Oregon	1,143	8	27.0	0.2
Connecticut	1,114	6	30.8	0.2
Missouri	911	11	14.7	0.2
Arizona	841	15	11.3	0.2
Indiana	838	13	12.2	0.2
Tennessee	795	15	11.2	0.2
Wisconsin	728	4	12.3	0.1
Kentucky	714	6	15.8	0.1
Hawaii	640	0	44.6	0.0
District of Columbia	564	1	83.1	0.1
Kansas	549	4	18.7	0.1
Rhode Island	510	3	46.5	0.3
South Carolina	446	5	8.3	0.1
Utah	437	0	12.8	0.0
Alabama	400	6	7.8	0.1
Louisiana	373	10	8.2	0.2
New Mexico	366	0	17.3	0.0
Nevada	346	6	10.8	0.2
Delaware	168	159	16.3	15.4
Vermont	311	2	48.0	0.3
Maine	295	6	21.1	0.4
New Hampshire	292	2	20.8	0.1
Arkansas	278	5	9.1	0.2
Oklahoma	248	4	6.1	0.1
West Virginia	251	1	14.2	0.1
Nebraska	232	16	11.7	0.8
Iowa	212	4	6.6	0.1
Idaho	195	2	9.9	0.1
Montana	171	0	15.1	0.0
Mississippi	165	4	5.6	0.1
Alaska	129	2	17.6	0.3
North Dakota	118	1	15.1	0.1
South Dakota	103	0	11.2	0.0
Wyoming	100	0	17.1	0.0

Source: CMS NPPES (NPPES files on CMS.gov), primary NUCC taxonomy by practice state; 2023 population estimates (census.gov).

Common questions

How many Clinical Psychologist providers are there vs Intellectual & Developmental Disabilities Psychologist?

There are 69,391 Clinical Psychologist and 952 Intellectual & Developmental Disabilities Psychologist records in the CMS NPPES registry, counted by primary taxonomy.

Which specialty is spread across more states?

Clinical Psychologist has records in 56 states and territories, against 46.

Where is the data from?

Provider counts are from the CMS National Plan and Provider Enumeration System (NPPES). Per-capita rates use 2023 Census population estimates.

Two specialties are not substitutes: scope of practice, training and the conditions treated differ. More comparisons →

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of the NPPES file of Aug 9, 2026.