	observed	calculated	calculated	calculated	calculated	calculated
2024	1,597	$141,476,935	+17%	336,870	121	596
2023	1,266	$120,454,355	+13%	283,198	126	654
2022	1,199	$107,044,087	+2%	254,279	124	583
2021	1,088	$104,525,172	+14%	242,880	136	585
2020	1,053	$91,953,491	first year in data	216,939	132	535

Source: CMS Medicare Physician & Other Practitioners public use files (Original Medicare Part B fee-for-service). Data years 2020–2024.

By state

	observed	calculated	calculated	calculated	calculated
California	184	$30,187,092	73,306	175	1,361
Illinois	38	$16,990,916	29,876	302	1,137
Texas	213	$16,357,673	32,952	107	437
Florida	178	$11,720,133	37,487	147	640
New York	70	$6,036,217	17,969	161	934
Arizona	56	$4,588,981	11,131	138	565
Louisiana	61	$4,581,413	8,471	134	255
Pennsylvania	61	$4,556,308	6,797	95	274
New Jersey	45	$3,810,136	5,992	120	272
Nevada	31	$2,805,193	6,920	60	1,020
Maryland	33	$2,554,634	4,704	106	369
Alabama	54	$2,448,116	10,455	159	476
Virginia	49	$2,109,904	7,413	117	492
Mississippi	38	$2,016,380	4,868	115	304
Georgia	38	$1,338,760	5,948	93	454

Not listed: 20 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
Chicago-Naperville-Elgin, IL-IN	31	$15,939,599	27,290	275
Los Angeles-Long Beach-Anaheim, CA	85	$13,571,622	32,966	138
Houston-Pasadena-The Woodlands, TX	111	$11,370,501	20,984	129
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD	83	$7,006,282	10,750	97
New York-Newark-Jersey City, NY-NJ	68	$6,674,899	17,764	169
Las Vegas-Henderson-North Las Vegas, NV	30	$2,778,270	6,854	58
Fresno, CA	14	$2,749,939	6,680	334
Phoenix-Mesa-Chandler, AZ	42	$2,734,397	6,650	119
Washington-Arlington-Alexandria, DC-VA-MD-WV	42	$2,703,983	6,904	133
Oxnard-Thousand Oaks-Ventura, CA	14	$2,178,891	5,287	240
North Port-Bradenton-Sarasota, FL	19	$2,004,803	6,399	248
Orlando-Kissimmee-Sanford, FL	43	$1,791,362	5,693	74
San Jose-Sunnyvale-Santa Clara, CA	13	$1,439,743	3,502	276
Ocala, FL	12	$1,435,530	4,567	354
Lafayette, LA	19	$1,360,925	2,912	148

Source: CMS Medicare Physician & Other Practitioners public use files (Original Medicare Part B fee-for-service). The 32 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 A9555 nationally

Cardiology accounts for 64% of payment for A9555 nationally in 2023, across 5 specialties on claims.

	observed	calculated	calculated	calculated	calculated	calculated
Cardiology	856	68%	$76,549,790	64%	187,012	218
Interventional Cardiology	284	22%	$19,953,123	17%	50,067	176
Clinical Cardiac Electrophysiology	49	3.9%	$2,336,635	1.9%	5,977	122
Internal Medicine	34	2.7%	$1,677,814	1.4%	4,076	120
Diagnostic Radiology	16	1.3%	$455,622	0.38%	1,023	64

Not listed: 7 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 A9555 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