CPT code 33416: Septal myectomy, ventricular muscle resection2026 Medicare rate & RVUs in Illinois
Reports surgical removal of hypertrophied ventricular muscle, typically to relieve left ventricular outflow obstruction in obstructive hypertrophic cardiomyopathy.
CMS doesn’t publish an office rate for 33416 in Illinois.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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What 33416 covers
A cardiac surgeon removes a portion of thickened ventricular septal muscle to widen the left ventricular outflow tract, most often for obstructive hypertrophic cardiomyopathy. The operation is commonly performed through the aortic valve, with or without cardiopulmonary bypass. It is a facility-based major cardiac procedure, not a catheter-based septal reduction treatment.
Report the code when the operative record supports actual ventricular muscle resection; a subaortic membrane excision alone is a different service. Documentation should identify the obstructive condition, the muscle resected, and any separately performed valve procedure. The code has a 90-day global period, including the day-before preoperative visit and related postoperative care. When multiple procedures are performed in the same session, the highest-valued procedure is paid in full and others at 50%. Modifier 50 is inappropriate for this ventricular procedure. Assistant-at-surgery payment may be available; co-surgeon payment requires supporting documentation, and team surgery is not permitted.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
Where 33416 pays more and less in Illinois
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Chicago, IL | Unavailable | $2,291.95 |
| East St. Louis, IL | Unavailable | $2,165.73 |
| Rest of Illinois | Unavailable | $2,030.69 |
| Suburban Chicago, IL | Unavailable | $2,147.96 |
How the 33416 rate is calculated
Each of 33416’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · 33416
RVUs × geographic indexes × conversion factor
Work35.65
35.65 RVUs× 1.000 GPCI
Practice expense12.53
12.53 RVUs× 1.000 GPCI
Malpractice8.77
8.77 RVUs× 1.000 GPCI
Adjusted RVUs
56.9500
Conversion factor
$33.4009
Medicare rate
$1,902.18
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 33416
33416 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 33416
Septal myectomy, ventricular muscle resection
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 090 | Major surgery: the day before, the day of, and 90 days after are included. |
| Multiple procedures | 2 | Standard reduction: highest-valued procedure at 100%, others at 50%. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 2 | Paid. |
| Co-surgeons (62) | 1 | Permitted with supporting documentation. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
| Split (54/55/56) | 0.09/0.84/0.07 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Global surgery period · 33416
Septal myectomy, ventricular muscle resection
90-day global period ends
Dec 30, 2026
Covers Sep 30, 2026 through Dec 30, 2026 (92 days, including the day before surgery).
Visit on Oct 31, 2026
Day 30 of the 90-day post-op period: related follow-up care is included in the surgical payment.
Pre-op dayGlobal period
What modifiers do to the payment
Modifier 51 · payment effect
With and without the modifier
33416 without 51 · national facility
$1,902.18
Septal myectomy, ventricular muscle resection
33416-51 · Second procedure: 50%
$951.09
When this isn’t the highest-valued procedure in the session, Medicare pays 50% of its fee schedule amount (the highest is paid at 100%).
33416 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 33415Subaortic resectionDiscrete subaortic stenosis
- Choose 33416 for resection of hypertrophied ventricular muscle. Choose 33415 for excision of a subaortic membrane.
- 33425Mitral valve repairWithout prosthetic ring
- 33425 represents mitral valve repair, not ventricular muscle resection. It may be reported with 33416 when both distinct operations are performed.
- 33405Aortic valve replacementStandard prosthetic valve
- 33405 represents open aortic valve replacement. It is not a substitute for septal muscle resection, though both may be performed when separately indicated.
33416 billing questions
How is 33416 different from 33415?
33416 represents removal of hypertrophied ventricular muscle, commonly for obstructive hypertrophic cardiomyopathy. Use 33415 when the operation excises a subaortic membrane rather than ventricular muscle.
Can 33416 be reported with a valve procedure?
It may be reported with a separately performed valve operation when both procedures are supported by the operative record. CMS applies the standard multiple-procedure reduction when multiple procedures are performed in the same session.
Does the code include cardiopulmonary bypass?
The myectomy may be performed with or without cardiopulmonary bypass. The bypass approach does not change the muscle-resection service represented by 33416.
What documentation supports reporting 33416?
Document the obstructive condition, the ventricular muscle resected, and the operative work performed. If a membrane or valve procedure was also performed, describe that distinct work separately.
Can modifier 50 be used?
No. The ventricular anatomy and procedure do not support bilateral reporting with modifier 50.
How are assistant and co-surgeon services handled?
Assistant-at-surgery payment may be made for this procedure. Co-surgeon payment requires supporting documentation; team surgery is not permitted.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file lines behind this rate
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