	observed	calculated	calculated	calculated	calculated
California	2,328	$37,584,070	295,000	78	397
Idaho	139	$32,193,064	250,864	58	5,528
Colorado	628	$26,453,328	212,627	39	239
Florida	1,444	$22,449,061	177,491	74	329
New York	1,192	$21,478,751	168,750	74	482
Pennsylvania	1,785	$19,936,695	155,790	49	292
Texas	1,752	$17,272,519	135,952	57	195
Illinois	942	$16,243,734	128,699	92	398
Massachusetts	643	$16,127,051	126,438	82	693
Ohio	1,254	$15,290,785	120,230	67	258
Virginia	907	$13,596,837	106,690	70	363
New Jersey	778	$12,858,975	100,936	73	412
North Carolina	902	$11,089,373	87,333	62	295
Maryland	662	$9,960,847	77,927	58	428
Iowa	458	$9,179,168	71,860	86	501

Not listed: 1 billers with an armed-forces or unknown state code (AE); 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 2023.

Top metro areas

	observed	calculated	calculated	calculated
Boise City, ID	72	$31,168,850	242,684	59
New York-Newark-Jersey City, NY-NJ	1,272	$24,674,321	193,791	81
Denver-Aurora-Centennial, CO	284	$23,350,167	188,140	39
Chicago-Naperville-Elgin, IL-IN	607	$11,999,713	95,369	111
Boston-Cambridge-Newton, MA-NH	530	$11,336,967	88,891	50
Los Angeles-Long Beach-Anaheim, CA	809	$10,593,203	83,104	69
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD	638	$10,016,374	78,420	74
Washington-Arlington-Alexandria, DC-VA-MD-WV	574	$8,099,607	63,302	59
San Francisco-Oakland-Fremont, CA	276	$6,708,767	52,738	144
Baltimore-Columbia-Towson, MD	358	$5,217,008	40,880	56
Minneapolis-St. Paul-Bloomington, MN-WI	520	$5,118,237	40,685	26
Seattle-Tacoma-Bellevue, WA	354	$4,772,178	37,353	70
Miami-Fort Lauderdale-West Palm Beach, FL	347	$4,657,808	37,064	58
St. Louis, MO-IL	223	$4,491,666	35,673	138
Phoenix-Mesa-Chandler, AZ	296	$4,484,600	35,344	60

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 2023.

Specialties billing 91320 nationally

Mass Immunizer Roster Biller accounts for 51% of payment for 91320 nationally in 2023, across 18 specialties on claims.

	observed	calculated	calculated	calculated	calculated	calculated
Mass Immunizer Roster Biller	13,819	51%	$215,545,614	51%	1,678,822	121
Centralized Flu	5,798	21%	$164,917,609	39%	1,317,259	227
Pharmacy	1,110	4.1%	$12,588,617	3.0%	98,262	89
Family Practice	2,622	9.7%	$10,455,556	2.5%	82,795	32
Internal Medicine	1,952	7.2%	$10,256,051	2.4%	80,722	41
Nurse Practitioner	1,108	4.1%	$3,256,195	0.77%	25,498	23
Public Health or Welfare Agency	66	0.24%	$1,338,351	0.32%	10,614	161
Clinical Laboratory	72	0.27%	$777,386	0.18%	6,054	84
Physician Assistant	263	0.97%	$643,243	0.15%	5,065	19
Infectious Disease	20	0.07%	$495,917	0.12%	3,872	194
Hospitalist	19	0.07%	$232,656	0.06%	1,815	96
All Other Suppliers	19	0.07%	$227,667	0.05%	1,772	93
Pediatric Medicine	37	0.14%	$189,759	0.04%	1,515	41
Geriatric Medicine	36	0.13%	$178,486	0.04%	1,401	39
General Practice	28	0.10%	$149,680	0.04%	1,214	43

Not listed: 22 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 2023.

Top billers of 91320 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