Medicare providers in Illinois

111,486 unique NPIs are enrolled in Medicare in Illinois, number 6 of 51. Practitioners in the 83 specialties tracked here account for 88,520 of them; the largest is nurse practitioner (14,776), and nurse practitioners outnumber family-practice physicians 3 to 1.

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1Enrolled NPIs 111,486
2Largest specialty Nurse Practitioner
3Rank of 51 #6
4Specialties present 83

Medicare-enrolled practitioners in Illinois by specialty, 15 largest, bars to scale. Source: CMS PPEF, 2026-09-29.

Every specialty in Illinois

Each figure is the number of NPIs enrolled in Medicare in Illinois under that specialty, beside its share of the specialty's national total.

Specialty	IL	Share of US
Nurse Practitioner	14,776	4%
Physician Assistant	5,767	3.3%
Internal Medicine	5,314	4.1%
Physical Therapist in Private Practice	5,285	4.6%
Family Practice	4,869	4.2%
Clinical Social Worker	4,425	4.5%
Emergency Medicine	3,163	4.9%
Mental Health Counselor	2,797	3.9%
Diagnostic Radiology	2,676	7%
Certified Registered Nurse Anesthetist (CRNA)	2,542	4.1%
Anesthesiology	2,385	4.7%
Pediatric Medicine	2,358	4.2%
Chiropractic	2,234	4.9%
Optometry	1,985	4.3%
Obstetrics/Gynecology	1,931	4.6%
Hospitalist	1,823	6.2%
Clinical Psychologist	1,782	4.9%
Psychiatry	1,573	4.3%
General Surgery	1,178	4.2%
Neurology	1,155	5.4%
Occupational Therapist in Private Practice	1,114	4.5%
Orthopedic Surgery	1,101	4.1%
Cardiovascular Disease (Cardiology)	1,027	4.2%
Podiatry	960	5.5%
Gastroenterology	920	5.1%
Ophthalmology	895	4.3%
Pathology	798	5.4%
Hematology/Oncology	613	5%
Pulmonary Disease	601	4.4%
Dermatology	593	4%
Qualified Speech Language Pathologist	588	4.1%
Urology	548	4.7%
Nephrology	526	4.7%
Physical Medicine and Rehabilitation	498	4.6%
Otolaryngology	478	4.2%
Qualified Audiologist	477	4.1%
Registered Dietitian or Nutrition Professional	449	4%
Critical Care (Intensivists)	435	5.4%
Interventional Cardiology	378	6.6%
Infectious Disease	377	4.5%
Endocrinology	369	4.4%
Radiation Oncology	343	5.8%
Certified Nurse Midwife (Cnm)	339	3.5%
Neurosurgery	275	4.2%
Rheumatology	270	4.3%
Plastic and Reconstructive Surgery	240	4.1%
Dentist	229	3.8%
Vascular Surgery	204	4.4%
Interventional Radiology	203	5.5%
Allergy/Immunology	199	4.7%
Thoracic Surgery	188	5.2%
Certified Clinical Nurse Specialist (Cns)	179	8%
Cardiac Electrophysiology	177	5.9%
Medical Oncology	165	3.2%
General Practice	149	1.6%
Marriage and Family Therapist	146	0.9%
Pain Management	131	3.5%
Sports Medicine	121	4.6%
Geriatric Medicine	106	4%
Hospice/Palliative Care	105	3.5%
Hand Surgery	95	4.8%
Oral Surgery	90	2.4%
Cardiac Surgery	89	5.3%
Colorectal Surgery (Proctology)	82	4%
Surgical Oncology	77	4.8%
Sleep Medicine	71	5.3%
Interventional Pain Management	68	3.8%
Advanced Heart Failure and Transplant Cardiology	66	6.3%
Gynecological Oncology	60	4.4%
Preventive Medicine	49	4.7%
Maxillofacial Surgery	48	4.4%
Hematology	39	3%
Epileptologists	28	7.8%
Addiction Medicine	24	3%
Micrographic Dermatologic Surgery (Mds)	19	3.1%
Neuropsychiatry	17	3.9%
Osteopathic Manipulative Medicine	15	1.3%
Nuclear Medicine	14	1.9%
Medical Genetics and Genomics	12	2.6%
Other (Non-Physician)	11	2.8%
Psychologist Billing Independently	8	0.8%
Other (Physician)	4	0.8%
Anesthesiology Assistant	2	0%

Source: CMS Medicare Fee-For-Service Public Provider Enrollment, extract of 2026-09-29; unique NPIs per state. Checked 2026-10-24. Methodology.