	observed	calculated	calculated	calculated	calculated
California	2,609	$14,856,314	336,495	55	317
Colorado	541	$11,043,285	272,492	54	397
Florida	2,609	$10,469,856	264,078	52	330
Texas	2,477	$9,857,545	247,416	42	248
Michigan	1,110	$8,448,608	219,428	82	819
New York	1,665	$7,539,837	175,757	55	361
Pennsylvania	1,734	$7,387,148	187,714	45	332
Idaho	204	$7,182,349	174,451	44	865
Ohio	1,429	$6,339,785	167,000	53	409
North Carolina	1,291	$5,999,715	157,420	52	424
Illinois	1,047	$5,005,770	123,439	45	419
Wisconsin	749	$4,820,057	126,723	73	594
Washington	761	$3,951,258	96,074	52	439
New Jersey	772	$3,576,840	80,442	59	307
Virginia	996	$3,560,517	87,133	40	322

Not listed: 1 billers with an armed-forces or unknown state code (ZZ); they are in the national totals.

Not listed: 3 states with fewer than 11 billers (small cells).

Source: CMS Medicare Physician & Other Practitioners public use files (Original Medicare Part B fee-for-service). Providers placed by practice address. Data year 2021.

Top metro areas

	observed	calculated	calculated	calculated
Denver-Aurora-Centennial, CO	284	$9,951,922	245,142	58
Boise City, ID	128	$6,756,608	162,769	35
New York-Newark-Jersey City, NY-NJ	1,435	$6,603,116	144,254	55
Los Angeles-Long Beach-Anaheim, CA	912	$4,449,996	100,829	62
San Francisco-Oakland-Fremont, CA	305	$4,173,765	89,498	55
Miami-Fort Lauderdale-West Palm Beach, FL	751	$4,028,213	98,909	64
Houston-Pasadena-The Woodlands, TX	716	$4,003,622	98,608	42
Chicago-Naperville-Elgin, IL-IN	720	$3,915,737	95,230	50
Detroit-Warren-Dearborn, MI	492	$3,559,152	90,402	92
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD	709	$3,075,593	72,454	58
Pittsburgh, PA	495	$2,600,747	67,256	47
Seattle-Tacoma-Bellevue, WA	459	$2,357,472	56,336	51
Dallas-Fort Worth-Arlington, TX	575	$2,292,605	57,539	46
Phoenix-Mesa-Chandler, AZ	340	$2,176,732	56,230	96
Boston-Cambridge-Newton, MA-NH	354	$2,124,600	48,714	69

Source: CMS Medicare Physician & Other Practitioners public use files (Original Medicare Part B fee-for-service). The 100 areas with the most payment among those with at least 11 billers; non-metro parts of each state are one area. Data year 2021.

Specialties billing 0003A nationally

Mass Immunizer Roster Biller accounts for 39% of payment for 0003A nationally in 2021, across 28 specialties on claims.

	observed	calculated	calculated	calculated	calculated	calculated
Mass Immunizer Roster Biller	15,916	48%	$64,140,157	39%	1,623,446	102
Centralized Flu	6,726	20%	$59,293,922	36%	1,468,494	218
Family Practice	4,384	13%	$12,386,123	7.5%	317,768	72
Internal Medicine	2,508	7.6%	$10,271,729	6.2%	256,125	102
Pharmacy	1,185	3.6%	$6,680,540	4.0%	169,692	143
Infectious Disease	50	0.15%	$3,517,967	2.1%	79,629	1,593
Nurse Practitioner	1,018	3.1%	$1,611,164	0.97%	42,442	42
Clinical Laboratory	223	0.67%	$1,380,723	0.83%	35,864	161
Emergency Medicine	112	0.34%	$949,108	0.57%	23,513	210
Pediatric Medicine	95	0.29%	$902,281	0.55%	22,292	235
General Practice	138	0.42%	$721,107	0.44%	18,119	131
Public Health or Welfare Agency	48	0.14%	$566,460	0.34%	14,687	306
Physician Assistant	378	1.1%	$472,536	0.29%	12,227	32
Hospitalist	19	0.06%	$313,282	0.19%	7,789	410
All Other Suppliers	25	0.08%	$154,667	0.09%	3,933	157

Not listed: 32 specialties with fewer than 11 billers (small cells).

Source: CMS Medicare Physician & Other Practitioners public use files (Original Medicare Part B fee-for-service). Provider-level lines (fewer than 11 beneficiaries suppressed by CMS); specialty is the provider type on claims. Data year 2021.

Top billers of 0003A nationally

Named top billers are a Pro figure, and Pro is not available to buy, so this list is not shown to any account. The counts and totals by state, metro area and specialty on this page are free.

Original Medicare Part B fee-for-service only; CMS suppresses provider lines with fewer than 11 beneficiaries. How these figures are computed · Limitations