Who bills the most Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg (J1561) to Medicare in Texas?
Medicare Part B FFS · CY2024 · as published by CMS10 physician groups billed Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg (J1561) to Medicare fee-for-service in Texas in 2024; independent (non-hospital-affiliated) groups deliver 1%.
J1561 — Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg · Source: CMS Medicare Physician & Other Practitioners PUF (Part B), CY2024 release. Medicare fee-for-service only.
Snapshot covers the whole Texas market — the table below shows the top 100 groups (free tier).
Medicare fee-for-service covers 46% of Medicare in Texas; Medicare Advantage penetration 43% → 54% since 2020.
| # | Physician group | City | St | Specialty | Providers | J1561 svcs | Share* | Phone |
|---|---|---|---|---|---|---|---|---|
| 1 | ROBERT A ZAJAC MD PA | SAN ANTONIO | TX | NURSE PRACTITIONER | 6 | 50,120 | 6.5% | (210) 481-2800 |
| 2 | MHS PHYSICIANS OF TEXAS | HUMBLE | TX | NEUROLOGY | 114 | 48,678 | 6.3% | (281) 319-8530 |
| 3 | MID CITIES NEUROLOGY ASSOCIATES, P.A. | FORT WORTH | TX | NEUROLOGY | 12 | 37,216 | 4.8% | (817) 267-6290 |
| 4 | TALIS HEALTHCARE LLC | NEW CASTLE | TX | NURSE PRACTITIONER | 11 | 31,840 | 4.1% | — |
| 5 | TEXAS NEUROLOGY PA | DALLAS | TX | NEUROLOGY | 13 | 23,822 | 3.1% | (214) 827-3610 |
| 6 | INNOVATIVE INFUSIONS LLC | AUSTIN | TX | NURSE PRACTITIONER | 106 | 17,866 | 2.3% | (512) 261-4800 |
| 7 | UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS | TX | PHYSICIAN ASSISTANT | 3200 | 14,250 | 1.8% | (214) 633-5555 |
| 8 | SHETH, MD, P.A. | FRISCO | TX | NEUROLOGY | 23 | 11,210 | 1.5% | (214) 619-1910 |
| 9 | NORTH TEXAS INFECTIOUS DISEASES CONSULTANTS | DALLAS | TX | INFECTIOUS DISEASE | 11 | 7,380 | 1.0% | (214) 823-2533 |
| 10 | SANDEEP GUPTA, MD, PA | DALLAS | TX | ALLERGY/IMMUNOLOGY | 10 | 1,815 | 0.2% | (214) 369-1901 |
*Share of Texas's disclosed Medicare-FFS services for J1561, counted once per clinician. Volume is placed in the state it was billed from, so this page ranks the groups actually billing J1561 in Texas — including groups registered elsewhere ("City" is each 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.
How to read this. Figures are Medicare fee-for-service only — not all-payer — from the CMS Medicare Physician & Other Practitioners Public Use File (Part B), CY2024 release. CMS suppresses any provider×code row under 11 beneficiaries, so a missing group means "suppressed," never zero. "Charges" are provider-submitted amounts, not payments. Groups are ranked by measured service volume attributed to clinicians in exactly one group — clinicians affiliated with several groups are listed in rosters but never volume-attributed to a single group — a direct read of the public record, not a rating or quality score. Full method: Methods & Sources.
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 →