72157 — Mri scan of middle spinal canal before and after contrast
25,740 observed fee-for-service (49%) · ~26,602 estimated Medicare Advantage. Scaled from the observed floor by each state’s fee-for-service share (FFS share as of 2024) — scaled estimate — assumes MA utilization mirrors FFS; not an observation; 1 state without payer-mix data excluded. How we scale
Disclosed Medicare fee-for-service services by billing state; open a bar for that state's ranked market. Average submitted charge / service by billing state, among the highest-volume states; open a bar for that state's ranked market.
- Market position — where this market sits on volume and growth among all state markets, and its rank.
- Worth a look — every state market for this search, ranked by a published score: size, growth, fragmentation, below-expected volume.
- Lookalike opportunities — groups billing below what peers of the same specialty, size, and state predict, with the expected figure shown.
- National benchmarks — where each group's volume sits nationally and within its specialty.
- Market structure — how concentrated this market is, and who owns the volume.
- Medicare-wide scaling — the exact payer split, and this market total scaled to all of Medicare, labeled as an estimate.
Nevvi's market analytics platform — code baskets, market structure and share, the twelve-year trend layer — is built and not launched yet. We're gathering interest in it.
Notify me at launch →| # | Physician group | City | St | Specialty | Providers | 72157 svcs | Submitted charges | Avg charge | Medicare $ locked column | Share* | Phone |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | PHYSICIANS REFERRAL SERVICE | HOUSTON | TX | NURSE PRACTITIONER | 2696 | 1,551 | $1,738,026 | $1,121 | premium | 28.9% | (713) 592-5433 |
| 2 | MAYO CLINIC | ROCHESTER | MN | NURSE PRACTITIONER | 4896 | 637 | $2,626,539 | $4,123 | premium | 32.5% | (507) 284-2511 |
| 3 | NORTHWESTERN MEDICAL FACULTY FOUNDATION | CHICAGO | IL | NURSE PRACTITIONER | 4339 | 605 | $631,007 | $1,043 | premium | 22.6% | — |
| 4 | STANFORD HEALTH CARE | STANFORD | CA | DIAGNOSTIC RADIOLOGY | 3039 | 593 | $777,688 | $1,311 | premium | 9.7% | (650) 723-4000 |
| 5 | BRIGHAM AND WOMENS PHYSICIANS ORGANIZATION INC | BOSTON | MA | PHYSICIAN ASSISTANT | 2942 | 592 | $307,177 | $519 | premium | 17.3% | (617) 732-5500 |
| 6 | NEW YORK UNIVERSITY | NEW YORK | NY | DIAGNOSTIC RADIOLOGY | 5704 | 576 | $1,585,339 | $2,752 | premium | 9.3% | (212) 263-9700 |
| 7 | MASSACHUSETTS GENERAL PHYSICIANS ORGANIZATION INC | BOSTON | MA | DIAGNOSTIC RADIOLOGY | 3532 | 494 | $1,026,363 | $2,078 | premium | 14.4% | (617) 724-0287 |
| 8 | OSU RADIOLOGY LLC | COLUMBUS | OH | DIAGNOSTIC RADIOLOGY | 174 | 487 | $245,935 | $505 | premium | 23.1% | (614) 293-8315 |
| 9 | H LEE MOFFITT CANCER CTR AND RES INST LIFE TIME CANCER SCRN CTR INC | TAMPA | FL | PHYSICIAN ASSISTANT | 1103 | 477 | $258,159 | $541 | premium | 13.6% | (813) 745-4673 |
| 10 | MAYO CLINIC ARIZONA | PHOENIX | AZ | PHYSICIAN ASSISTANT | 1635 | 389 | $573,291 | $1,474 | premium | 25.0% | (800) 603-0558 |
| 11 | REGENTS OF THE UNIVERSITY OF CALIFORNIA | SAN DIEGO | CA | DIAGNOSTIC RADIOLOGY | 2057 | 372 | $387,178 | $1,041 | premium | 6.1% | (800) 926-8273 |
| 12 | ADVANCED RADIOLOGY SERVICES PC | GRAND RAPIDS | MI | DIAGNOSTIC RADIOLOGY | 249 | 336 | $118,944 | $354 | premium | 15.1% | (616) 363-7272 |
| 13 | RHODE ISLAND MEDICAL IMAGING INC | EAST PROVIDENCE | RI | DIAGNOSTIC RADIOLOGY | 109 | 333 | $225,906 | $678 | premium | 88.3% | (401) 626-3900 |
| 14 | REGENTS OF THE UNIVERSITY OF MICHIGAN | ANN ARBOR | MI | INTERNAL MEDICINE | 3330 | 331 | $270,416 | $817 | premium | 14.8% | (734) 763-5459 |
| 15 | THE ASSOCIATION OF UNIVERSITY PHYSICIANS | SEATTLE | WA | PHYSICIAN ASSISTANT | 3612 | 331 | $111,642 | $337 | premium | 29.0% | (206) 364-0500 |
| 16 | MSKCC RADIOLOGY GROUP | NEW YORK | NY | DIAGNOSTIC RADIOLOGY | 199 | 322 | $209,300 | $650 | premium | 5.2% | (646) 888-5300 |
| 17 | DUKE HEALTH INTEGRATED PRACTICE INC | DURHAM | NC | PHYSICIAN ASSISTANT | 3051 | 292 | $189,508 | $649 | premium | 16.1% | (919) 684-8111 |
| 18 | CITY OF HOPE MEDICAL FOUNDATION | DUARTE | CA | NURSE PRACTITIONER | 942 | 283 | $133,067 | $470 | premium | 4.6% | (626) 256-4673 |
| 19 | UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS | TX | PHYSICIAN ASSISTANT | 3200 | 267 | $114,057 | $427 | premium | 5.0% | (214) 633-5555 |
| 20 | BEAUMONT MEDICAL GROUP HOSPITAL BASED SERVICES | TROY | MI | DIAGNOSTIC RADIOLOGY | 583 | 262 | $193,648 | $739 | premium | 11.7% | (248) 964-1187 |
| 21 | MASS GENERAL BRIGHAM COMMUNITY PHYSICIANS INC | MEDFORD | MA | DIAGNOSTIC RADIOLOGY | 424 | 246 | $121,020 | $492 | premium | 7.2% | (781) 395-4909 |
| 22 | SUTTER VALLEY MEDICAL FOUNDATION | SACRAMENTO | CA | DIAGNOSTIC RADIOLOGY | 2420 | 242 | $318,107 | $1,314 | premium | 4.0% | (916) 681-8852 |
| 23 | UNIVERSITY OF ARKANSAS FOR MEDICAL SCIENCES | LITTLE ROCK | AR | NURSE PRACTITIONER | 1241 | 240 | $102,720 | $428 | premium | 55.8% | (501) 686-8000 |
| 24 | HOUSTON RADIOLOGY ASSOCIATED | HOUSTON | TX | DIAGNOSTIC RADIOLOGY | 103 | 237 | $216,612 | $914 | premium | 4.4% | (281) 206-9020 |
| 25 | MAYO CLINIC JACKSONVILLE | JACKSONVILLE | FL | NURSE PRACTITIONER | 1587 | 225 | $1,167,856 | $5,190 | premium | 6.4% | (904) 953-2000 |
| 26 | ZWANGER AND PESIRI RADIOLOGY GROUP LLP | LINDENHURST | NY | DIAGNOSTIC RADIOLOGY | 91 | 216 | $437,046 | $2,023 | premium | 3.5% | (631) 225-7200 |
| 27 | ENDEAVOR HEALTH MEDICAL GROUP | EVANSTON | IL | NURSE PRACTITIONER | 3380 | 199 | $85,224 | $428 | premium | 7.4% | — |
| 28 | YALE UNIVERSITY | NEW HAVEN | CT | PHYSICIAN ASSISTANT | 2649 | 182 | $101,920 | $560 | premium | 26.1% | (203) 688-4242 |
| 29 | STATE UNIVERSITY OF IOWA | IOWA CITY | IA | PHYSICIAN ASSISTANT | 1902 | 162 | $123,492 | $762 | premium | 36.3% | (319) 678-8201 |
| 30 | WEST COUNTY RADIOLOGICAL GROUP INC | SAINT LOUIS | MO | DIAGNOSTIC RADIOLOGY | 104 | 155 | $79,445 | $513 | premium | 9.3% | (314) 941-5600 |
| 31 | ROPER RADIOLOGISTS PA | CHARLESTON | SC | DIAGNOSTIC RADIOLOGY | 40 | 149 | $159,877 | $1,073 | premium | 20.3% | (843) 724-2161 |
| 32 | UMASS MEMORIAL MEDICAL GROUP INC | WORCESTER | MA | PHYSICIAN ASSISTANT | 2483 | 147 | $88,494 | $602 | premium | 4.3% | (508) 334-1000 |
| 33 | RADIOLOGY REGIONAL CENTER P A | FORT MYERS | FL | DIAGNOSTIC RADIOLOGY | 52 | 146 | $291,555 | $1,997 | premium | 4.2% | (239) 936-2316 |
| 34 | UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL | CHAPEL HILL | NC | NURSE PRACTITIONER | 2120 | 142 | $52,682 | $371 | premium | 7.8% | (984) 215-5556 |
| 35 | DIGNITY HEALTH MEDICAL FOUNDATION | FOLSOM | CA | DIAGNOSTIC RADIOLOGY | 1197 | 141 | $107,368 | $761 | premium | 2.3% | (916) 983-7476 |
| 36 | SDMI, LLC | LAS VEGAS | NV | DIAGNOSTIC RADIOLOGY | 36 | 140 | $202,580 | $1,447 | premium | 29.3% | (702) 732-6000 |
| 37 | PRISMA HEALTH UNIVERSITY MEDICAL GROUP | GREENVILLE | SC | NURSE PRACTITIONER | 2447 | 139 | $59,909 | $431 | premium | 18.9% | — |
| 38 | RADIOLOGY ASSOCIATES OF NORTH TEXAS PA | FORT WORTH | TX | DIAGNOSTIC RADIOLOGY | 340 | 139 | $66,720 | $480 | premium | 2.6% | (817) 321-0470 |
| 39 | NORTHSIDE RADIOLOGY ASSOCIATES LLC | ATLANTA | GA | DIAGNOSTIC RADIOLOGY | 370 | 139 | $207,805 | $1,495 | premium | 14.1% | (404) 851-6577 |
| 40 | UNIVERSITY OF UTAH ADULT SERVICES | SALT LAKE CITY | UT | PHYSICIAN ASSISTANT | 1783 | 137 | $70,327 | $513 | premium | 32.3% | (801) 581-2121 |
| 41 | UNIVERSITY HOSPITALS MEDICAL GROUP INC | CLEVELAND | OH | NURSE PRACTITIONER | 2232 | 136 | $45,560 | $335 | premium | 6.5% | — |
| 42 | ADVANCED RADIOLOGY P A | BALTIMORE | MD | DIAGNOSTIC RADIOLOGY | 161 | 135 | $195,096 | $1,445 | premium | 8.7% | (888) 972-9700 |
| 43 | SOUTHWEST NEURO-IMAGING LTD | PHOENIX | AZ | DIAGNOSTIC RADIOLOGY | 8 | 129 | $64,433 | $499 | premium | 8.3% | (602) 954-6228 |
| 44 | OU HEALTH PARTNERS INC | OKLAHOMA CITY | OK | PHYSICIAN ASSISTANT | 1160 | 125 | $57,313 | $459 | premium | 29.6% | (405) 271-4311 |
| 45 | HARVARD MEDICAL FACULTY PHYS AT BETH ISRAEL DEACONESS MED CTR INC | BOSTON | MA | INTERNAL MEDICINE | 1689 | 125 | $45,750 | $366 | premium | 3.6% | (781) 983-9088 |
| 46 | UC REGENTS | ORANGE | CA | DIAGNOSTIC RADIOLOGY | 99 | 125 | $65,000 | $520 | premium | 2.1% | (714) 456-7004 |
| 47 | MERCY CLINIC SPRINGFIELD COMMUNITIES | SPRINGFIELD | MO | PHYSICIAN ASSISTANT | 1128 | 118 | $49,796 | $422 | premium | 7.1% | — |
| 48 | NORTHWESTERN MEDICAL FACULTY FOUNDATION | CHICAGO | PA | NURSE PRACTITIONER | 4339 | 116 | $76,328 | $658 | premium | 4.7% | — |
| 49 | NEW YORK UNIVERSITY | NEW YORK | PA | DIAGNOSTIC RADIOLOGY | 5704 | 113 | $349,002 | $3,089 | premium | 4.6% | (212) 263-9700 |
| 50 | RADIOLOGY LTD LLC | TUCSON | AZ | DIAGNOSTIC RADIOLOGY | 102 | 110 | $320,113 | $2,910 | premium | 7.1% | (520) 290-4842 |
| 51 | UNIVERSITY OF MIAMI | MIAMI | FL | NURSE PRACTITIONER | 2331 | 109 | $48,178 | $442 | premium | 3.1% | (305) 689-5437 |
| 52 | CHARLOTTE RADIOLOGY PA | CHARLOTTE | NC | DIAGNOSTIC RADIOLOGY | 218 | 108 | $68,796 | $637 | premium | 6.0% | (704) 362-1945 |
| 53 | NEURO INTERVENTIONAL AND DIAGNOSTIC ASSOCIATES, PC | LEES SUMMIT | MO | DIAGNOSTIC RADIOLOGY | 5 | 104 | $48,256 | $464 | premium | 6.3% | (816) 347-5000 |
| 54 | PROGRESSIVE PHYSICIAN ASSOC INC | PHILLIPSBURG | PA | DIAGNOSTIC RADIOLOGY | 160 | 101 | $49,490 | $490 | premium | 4.1% | (908) 859-6700 |
| 55 | LOYOLA UNIVERSITY MEDICAL CENTER | MAYWOOD | IL | NURSE PRACTITIONER | 933 | 100 | $49,600 | $496 | premium | 3.7% | (708) 216-8372 |
| 56 | NEURO IR OF EAST TEXAS | TYLER | TX | DIAGNOSTIC RADIOLOGY | 3 | 100 | $62,200 | $622 | premium | 1.9% | (903) 705-0072 |
| 57 | MINNEAPOLIS CLINIC OF NEUROLOGY LTD | GOLDEN VALLEY | MN | NEUROLOGY | 72 | 99 | $303,868 | $3,069 | premium | 5.0% | (763) 588-0661 |
| 58 | RADIOLOGY SUBSPECIALISTS OF NORTHERN ILLINOIS LLC | GENEVA | IL | DIAGNOSTIC RADIOLOGY | 32 | 98 | $83,487 | $852 | premium | 3.7% | (630) 208-4412 |
| 59 | KETTERING NETWORK RADIOLOGISTS INC | DAYTON | OH | DIAGNOSTIC RADIOLOGY | 74 | 96 | $48,864 | $509 | premium | 4.6% | (937) 558-3800 |
| 60 | COMMONWEALTH RADIOLOGY PC | RICHMOND | VA | DIAGNOSTIC RADIOLOGY | 49 | 95 | $27,075 | $285 | premium | 5.7% | (804) 288-8327 |
| 61 | BRIGHAM AND WOMENS PHYSICIANS ORGANIZATION INC | BOSTON | NY | PHYSICIAN ASSISTANT | 2942 | 95 | $47,975 | $505 | premium | 1.5% | (617) 732-5500 |
| 62 | RADIOLOGY CONSULTANTS PC | OMAHA | NE | DIAGNOSTIC RADIOLOGY | 46 | 94 | $38,916 | $414 | premium | 22.8% | (402) 717-4760 |
| 63 | LAHEY CLINIC INC | BURLINGTON | MA | NURSE PRACTITIONER | 1400 | 94 | $47,407 | $504 | premium | 2.7% | — |
| 64 | MEDICAL CENTER RADIOLOGISTS INC | NORFOLK | VA | DIAGNOSTIC RADIOLOGY | 123 | 93 | $32,457 | $349 | premium | 5.6% | (757) 466-6870 |
| 65 | JOHNS HOPKINS UNIVERSITY | BALTIMORE | MD | NURSE PRACTITIONER | 2900 | 92 | $126,977 | $1,380 | premium | 5.9% | (410) 502-4340 |
| 66 | STONY BROOK RADIOLOGY, UNIVERSITY FACULTY PRACTICE CORPORATION | STONY BROOK | NY | DIAGNOSTIC RADIOLOGY | 59 | 91 | $39,990 | $439 | premium | 1.5% | (631) 638-2121 |
| 67 | UNIVERSITY OF CINCINNATI PHYSICIANS COMPANY LLC | CINCINNATI | OH | NURSE PRACTITIONER | 1504 | 91 | $31,122 | $342 | premium | 4.3% | (513) 584-1000 |
| 68 | NORTH SHORE HEMATOLOGY ONCOLOGY ASSOCIATES PC | SMITHTOWN | NY | NURSE PRACTITIONER | 462 | 91 | $136,500 | $1,500 | premium | 1.5% | (631) 751-3000 |
| 69 | RUSH UNIVERSITY MEDICAL GROUP | CHICAGO | IL | PHYSICIAN ASSISTANT | 1496 | 90 | $33,210 | $369 | premium | 3.4% | (312) 563-2875 |
| 70 | UNIVERSITY PROFESSIONAL SERVICES | PORTLAND | OR | PHYSICIAN ASSISTANT | 1717 | 90 | $27,270 | $303 | premium | 15.1% | (503) 494-8311 |
| 71 | SANFORD CLINIC | SIOUX FALLS | SD | DIAGNOSTIC RADIOLOGY | 276 | 87 | $58,290 | $670 | premium | 32.3% | (605) 328-8700 |
| 72 | CENTRAL ILLINOIS RADIOLOGICAL ASSOCIATES LTD | PEORIA | IL | DIAGNOSTIC RADIOLOGY | 196 | 86 | $63,984 | $744 | premium | 3.2% | (309) 655-2000 |
| 73 | SCOTT AND WHITE CLINIC | TEMPLE | TX | PHYSICIAN ASSISTANT | 2435 | 86 | $48,504 | $564 | premium | 1.6% | (254) 724-2663 |
| 74 | RADIOLOGY ASSOCIATES OF RICHMOND INC | RICHMOND | VA | DIAGNOSTIC RADIOLOGY | 70 | 84 | $28,326 | $337 | premium | 5.0% | (804) 272-8806 |
| 75 | KANSAS UNIVERSITY PHYSICIANS INC | KANSAS CITY | KS | NURSE PRACTITIONER | 1815 | 84 | $22,638 | $269 | premium | 18.3% | (913) 588-1227 |
| 76 | HAMPTON ROADS RADIOLOGY ASSOCIATES PC | VIRGINIA BEACH | VA | DIAGNOSTIC RADIOLOGY | 37 | 83 | $36,686 | $442 | premium | 5.0% | (757) 916-9630 |
| 77 | EASTERN RADIOLOGISTS INC | GREENVILLE | NC | DIAGNOSTIC RADIOLOGY | 93 | 81 | $31,347 | $387 | premium | 4.5% | (252) 752-5000 |
| 78 | NEW YORK UNIVERSITY | NEW YORK | CO | DIAGNOSTIC RADIOLOGY | 5704 | 80 | $288,038 | $3,600 | premium | 7.0% | (212) 263-9700 |
| 79 | SPRINGFIELD CLINIC, LLP | SPRINGFIELD | IL | NURSE PRACTITIONER | 686 | 78 | $194,053 | $2,488 | premium | 2.9% | (217) 544-6464 |
| 80 | COLUMBUS RADIOLOGY CORP | COLUMBUS | NC | DIAGNOSTIC RADIOLOGY | 288 | 77 | $112,827 | $1,465 | premium | 4.2% | (614) 228-7231 |
| 81 | LAKELAND RADIOLOGISTS P A | FLOWOOD | MS | DIAGNOSTIC RADIOLOGY | 29 | 77 | $45,353 | $589 | premium | 20.0% | (601) 936-2390 |
| 82 | NEW YORK UNIVERSITY | NEW YORK | WA | DIAGNOSTIC RADIOLOGY | 5704 | 77 | $282,603 | $3,670 | premium | 6.7% | (212) 263-9700 |
| 83 | WEST VIRGINIA UNIVERSITY MEDICAL CORPORATION | MORGANTOWN | WV | PHYSICIAN ASSISTANT | 1996 | 77 | $29,568 | $384 | premium | 47.8% | (304) 598-4865 |
| 84 | RADIOLOGY PHYSICIANS INC | DAYTON | OH | DIAGNOSTIC RADIOLOGY | 61 | 76 | $31,996 | $421 | premium | 3.6% | (937) 208-8000 |
| 85 | WASHINGTON UNIVERSITY | SAINT LOUIS | MO | NURSE PRACTITIONER | 3070 | 75 | $65,100 | $868 | premium | 4.5% | (314) 747-3000 |
| 86 | BASHA DIAGNOSTICS P C | ROYAL OAK | MI | DIAGNOSTIC RADIOLOGY | 25 | 75 | $64,638 | $862 | premium | 3.4% | (248) 288-1600 |
| 87 | NORTHWEST RADIOLOGY ASSOCIATES SC | ARLINGTON HEIGHTS | IL | DIAGNOSTIC RADIOLOGY | 21 | 73 | $27,229 | $373 | premium | 2.7% | (847) 618-1000 |
| 88 | IHC HEALTH SERVICES INC | MURRAY | UT | PHYSICIAN ASSISTANT | 3944 | 73 | $48,293 | $662 | premium | 17.2% | (801) 261-8346 |
| 89 | TEMPLE FACULTY PRACTICE PLAN INC | PHILADELPHIA | PA | PHYSICIAN ASSISTANT | 1330 | 72 | $30,240 | $420 | premium | 2.9% | — |
| 90 | EVANSVILLE RADIOLOGY PC | EVANSVILLE | IN | DIAGNOSTIC RADIOLOGY | 29 | 71 | $53,108 | $748 | premium | 11.8% | (812) 422-3254 |
| 91 | RADIOLOGY ASSOCIATES OF RIDGEWOOD P A | WALDWICK | NJ | DIAGNOSTIC RADIOLOGY | 20 | 71 | $60,080 | $846 | premium | 5.3% | (201) 445-8822 |
| 92 | CANCER SPECIALISTS LLC | JACKSONVILLE | FL | HEMATOLOGY/ONCOLOGY | 46 | 70 | $33,779 | $483 | premium | 2.0% | (904) 516-3737 |
| 93 | UNMC PHYSICIANS | OMAHA | NE | PHYSICIAN ASSISTANT | 1514 | 70 | $27,566 | $394 | premium | 16.9% | (402) 559-4000 |
| 94 | UNIVERSITY RADIOLOGY ASSOCIATES, LLP | SYRACUSE | NY | DIAGNOSTIC RADIOLOGY | 41 | 69 | $29,463 | $427 | premium | 1.1% | (315) 464-5189 |
| 95 | MECKLENBURG RADIOLOGY ASSOCIATES PA | CHARLOTTE | NC | DIAGNOSTIC RADIOLOGY | 94 | 68 | $25,908 | $381 | premium | 3.8% | (704) 332-1291 |
| 96 | BEVERLY RADIOLOGY MEDICAL GROUP III | GARDEN GROVE | CA | DIAGNOSTIC RADIOLOGY | 328 | 67 | $109,371 | $1,632 | premium | 1.1% | — |
| 97 | DIAGNOSTIC X-RAY PHYSICIANS, PSC | LOUISVILLE | KY | DIAGNOSTIC RADIOLOGY | 36 | 67 | $30,619 | $457 | premium | 17.0% | (502) 893-1000 |
| 98 | MEMPHIS RADIOLOGICAL PC | MEMPHIS | TN | DIAGNOSTIC RADIOLOGY | 51 | 64 | $32,128 | $502 | premium | 6.0% | (901) 561-6000 |
| 99 | TOLEDO RADIOLOGICAL ASSOCIATES INC | COLDWATER | OH | DIAGNOSTIC RADIOLOGY | 51 | 63 | $21,108 | $335 | premium | 3.0% | (517) 279-5400 |
| 100 | COLUMBUS RADIOLOGY CORP | COLUMBUS | OH | DIAGNOSTIC RADIOLOGY | 288 | 62 | $92,690 | $1,495 | premium | 2.9% | (614) 228-7231 |
Showing the top 100 of 309 groups — the full ranking is part of the market analytics platform — built, not launched yet. Notify me at launch →
*Share of the state's disclosed Medicare-FFS services for the primary code, counted once per clinician. "St" is the state the volume was billed from: a group appears in each state where its clinicians bill Medicare, with that state's volume and share ("City" is the group's registered location). Group figures sum clinicians affiliated with exactly one group; clinicians in several groups are listed in each group's drill-down but not volume-attributed to any single group, so shares reflect attributable volume. See Methods.
Comparing against an all-payer estimate?
These are exact counts from Medicare fee-for-service claims — roughly a third to half of most procedure markets, depending on payer mix. Modeled all-payer databases project the remainder statistically; we publish the audited floor and label it as such. Same market, different denominator. How the numbers reconcile →