CPT code 93583: Septal reduction, transcatheter approach2026 Medicare rate & RVUs in Missouri
Reports catheter-directed septal reduction, typically alcohol ablation for obstructive hypertrophic cardiomyopathy, performed in a cardiac catheterization setting.
CMS doesn’t publish an office rate for 93583 in Missouri.
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 93583 covers
An interventional cardiologist uses a catheter to deliver alcohol into a selected septal coronary branch, creating a controlled injury in the thickened heart muscle to reduce obstruction to blood flow. The procedure is typically performed in a hospital catheterization laboratory for a patient with obstructive hypertrophic cardiomyopathy. Temporary pacemaker insertion and selective coronary angiography, when performed as part of the treatment, are included in this service.
Report the code for the transcatheter septal-reduction treatment, not for closure of a congenital septal defect. The procedure report should support the indication, target branch, and treatment performed. CMS assigns a 0-day global period, so same-day preoperative and postoperative care is included. When multiple procedures are performed in the same session, the highest-valued procedure is paid in full and other procedures are subject to the standard 50% multiple-procedure reduction. Assistant-at-surgery payment requires documented medical necessity; co-surgeon and team-surgery payment are 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 93583 pays more and less in Missouri
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Kansas City, MO | Unavailable | $633.25 |
| Metropolitan St. Louis, MO | Unavailable | $637.04 |
| Rest of Missouri | Unavailable | $626.29 |
How the 93583 rate is calculated
Each of 93583’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 · 93583
RVUs × geographic indexes × conversion factor
Work13.41
13.41 RVUs× 1.000 GPCI
Practice expense2.58
2.58 RVUs× 1.000 GPCI
Malpractice3.20
3.20 RVUs× 1.000 GPCI
Adjusted RVUs
19.1900
Conversion factor
$33.4009
Medicare rate
$640.96
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 93583
The CMS indicators that decide how 93583 is paid alongside other services.
CMS payment indicators · 93583
Septal reduction, transcatheter approach
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 000 | Same-day global: pre- and post-op care on the day of the procedure is 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) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
What modifiers do to the payment
Modifier 51 · payment effect
With and without the modifier
93583 without 51 · national facility
$640.96
Septal reduction, transcatheter approach
93583-51 · Second procedure: 50%
$320.48
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%).
93583 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 93580ASD closureTranscatheter device closure
- 93580 is used for transcatheter closure of an atrial septal defect; 93583 reduces hypertrophied septal heart muscle.
- 93581VSD closureTranscatheter
- 93581 addresses transcatheter closure of a ventricular septal defect, not catheter-directed treatment of obstructive myocardial thickening.
- 33416Septal myectomyVentricular muscle resection
- 33416 describes surgical septal myectomy. Choose it for the surgical approach rather than catheter-directed septal reduction reported with 93583.
93583 billing questions
When should 93583 be selected instead of a septal defect closure code?
Use 93583 for catheter-directed reduction of hypertrophied heart muscle, typically in obstructive hypertrophic cardiomyopathy. Codes such as 93580 and 93581 describe closure of an atrial or ventricular septal defect.
Can selective coronary angiography be reported separately?
Selective coronary angiography performed as part of the septal-reduction treatment is included in 93583. The code also includes temporary pacemaker insertion when performed.
What supports reporting 93583?
The record should identify the clinical indication and document the catheter-based septal-reduction treatment, including the target branch and intervention performed.
How does the 0-day global period affect same-day care?
Same-day preoperative and postoperative care is included in the procedure's payment. The 0-day global period does not extend routine global care beyond the procedure date.
How are other procedures in the same session paid?
CMS pays the highest-valued procedure in full and applies the standard multiple-procedure reduction to other procedures performed in that session.
Can an assistant or co-surgeon be reported?
Assistant-at-surgery payment requires documentation of medical necessity. CMS does not permit co-surgeon or team-surgery payment for this service.
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
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