NPPES file of Aug 9, 2026

Internal Medicine Physician vs Nephrology Physician

Internal Medicine Physician has 11.0 times as many registry records as Nephrology Physician: 149,962 against 13,597. 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

Internal Medicine Physician: 149,962 records in 56 states

  1. California17,696
  2. New York12,067
  3. Florida10,151
  4. Texas9,175
  5. Pennsylvania7,300

Internal Medicine Physician nationwide →

Nephrology Physician: 13,597 records in 55 states

  1. California1,468
  2. Texas1,159
  3. New York1,049
  4. Florida840
  5. Pennsylvania651

Nephrology Physician nationwide →

By state, with records per 100,000 residents

StateInternal Medicine PhysicianNephrology PhysicianPer 100,000 (first)Per 100,000 (second)
California17,6961,46845.43.8
New York12,0671,04961.75.4
Florida10,15184044.93.7
Texas9,1751,15930.13.8
Pennsylvania7,30065156.35.0
Illinois7,23857257.74.6
Massachusetts6,82541797.56.0
Michigan5,73537657.13.7
Ohio5,27749944.84.2
New Jersey4,63243349.94.7
North Carolina4,05640337.43.7
Georgia3,91141735.53.8
Maryland3,90433763.25.5
Virginia3,59932741.63.8
Washington3,07928439.43.6
Arizona2,85327838.43.7
Minnesota2,63226145.94.5
Missouri2,60428542.04.6
Tennessee2,59626636.43.7
Connecticut2,62316772.54.6
Indiana2,10926530.73.9
Wisconsin2,07820735.23.5
Oregon2,11613650.03.2
Colorado2,04618234.83.1
South Carolina1,88120235.03.8
Louisiana1,74921938.24.8
Alabama1,70518333.43.6
Kentucky1,52617433.73.8
Nevada1,22912538.53.9
Oklahoma1,11511227.52.8
Rhode Island1,0335194.34.7
Mississippi97211033.13.7
Kansas1,0107034.32.4
District of Columbia90179132.711.6
Hawaii9026562.94.5
Iowa8719227.22.9
Nebraska8136341.13.2
Arkansas7689225.03.0
New Mexico7707936.43.7
West Virginia7546642.63.7
Utah6648419.42.5
New Hampshire6733748.02.6
Delaware6005258.15.0
Maine5975042.83.6
Idaho4533423.11.7
Montana3242628.62.3
Vermont3261550.42.3
North Dakota2452831.33.6
South Dakota2472626.92.8
Alaska1771424.11.9
Wyoming1341022.91.7

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

Common questions

How many Internal Medicine Physician providers are there vs Nephrology Physician?

There are 149,962 Internal Medicine Physician and 13,597 Nephrology Physician records in the CMS NPPES registry, counted by primary taxonomy.

Which specialty is spread across more states?

Internal Medicine Physician has records in 56 states and territories, against 55.

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.