	observed	calculated	calculated	calculated	calculated
California	2,159	$9,811,960	223,752	52	316
Florida	1,975	$8,833,694	224,287	63	347
Texas	2,346	$8,504,392	216,650	45	311
New York	1,652	$7,934,864	184,501	55	436
Pennsylvania	1,357	$6,248,781	159,859	54	378
Michigan	1,000	$5,892,584	155,129	53	639
Idaho	159	$4,698,408	113,197	50	577
Colorado	423	$4,311,865	107,167	32	226
Ohio	975	$3,931,366	105,738	40	425
North Carolina	851	$3,338,512	87,927	39	405
Illinois	668	$2,996,045	75,431	49	418
New Jersey	722	$2,917,569	66,157	53	304
Washington	547	$2,868,547	70,324	54	382
Georgia	1,017	$2,821,436	75,527	40	255
Virginia	713	$2,529,405	62,866	41	328

Not listed: 1 billers with an armed-forces or unknown state code (AP); 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
New York-Newark-Jersey City, NY-NJ	1,476	$6,897,375	152,406	57
Boise City, ID	65	$4,428,774	105,748	60
Denver-Aurora-Centennial, CO	211	$3,730,128	92,313	32
Los Angeles-Long Beach-Anaheim, CA	741	$3,688,891	82,989	57
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD	596	$2,290,701	54,743	53
Detroit-Warren-Dearborn, MI	432	$1,956,532	49,934	41
Chicago-Naperville-Elgin, IL-IN	452	$1,865,703	45,890	45
Miami-Fort Lauderdale-West Palm Beach, FL	463	$1,813,886	44,835	43
Houston-Pasadena-The Woodlands, TX	579	$1,589,516	39,916	37
Pittsburgh, PA	297	$1,501,382	38,985	54
Seattle-Tacoma-Bellevue, WA	276	$1,469,937	35,327	57
Dallas-Fort Worth-Arlington, TX	496	$1,459,118	36,531	41
Atlanta-Sandy Springs-Roswell, GA	521	$1,444,655	38,063	40
Boston-Cambridge-Newton, MA-NH	345	$1,407,548	32,317	44
San Francisco-Oakland-Fremont, CA	203	$1,223,762	26,180	53

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 0013A nationally

Mass Immunizer Roster Biller accounts for 53% of payment for 0013A nationally in 2021, across 26 specialties on claims.

	observed	calculated	calculated	calculated	calculated	calculated
Mass Immunizer Roster Biller	14,138	53%	$58,868,135	53%	1,492,348	106
Centralized Flu	4,073	15%	$24,790,384	22%	615,231	151
Pharmacy	1,625	6.1%	$9,344,992	8.3%	241,635	149
Family Practice	2,755	10%	$6,938,443	6.2%	178,183	65
Internal Medicine	1,924	7.3%	$5,663,397	5.1%	140,362	73
Nurse Practitioner	701	2.6%	$1,373,301	1.2%	36,824	53
Clinical Laboratory	188	0.71%	$956,314	0.85%	24,936	133
Pediatric Medicine	74	0.28%	$624,737	0.56%	15,151	205
Infectious Disease	40	0.15%	$557,020	0.50%	12,675	317
Emergency Medicine	109	0.41%	$391,518	0.35%	9,781	90
Physician Assistant	247	0.93%	$350,192	0.31%	9,361	38
General Practice	106	0.40%	$284,884	0.25%	7,266	69
Public Health or Welfare Agency	59	0.22%	$246,159	0.22%	6,661	113
Hospitalist	17	0.06%	$153,308	0.14%	3,590	211
Allergy/ Immunology	44	0.17%	$149,683	0.13%	3,644	83

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 0013A 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