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CPT code 33416: Septal myectomy, ventricular muscle resection2026 Medicare rate & RVUs

Reports surgical removal of hypertrophied ventricular muscle, typically to relieve left ventricular outflow obstruction in obstructive hypertrophic cardiomyopathy.

CMS RVU26DEffective Oct 1, 2026109 payment localities808 Medicare services in 2024

Medicare pays $1,902.18 for 33416 nationally in a facility.

Medicare rate · 33416

Septal myectomy, ventricular muscle resection

Office or facility?

Work RVUs
35.65
Total RVUs
56.95
Global days
090

National rate · 2026

$1,902.18

Facility setting, before claim adjustments.

See every locality for 33416 →Billed by an NP, PA or therapist? →

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

Your location

Medicare pays by the payment locality where the service is performed.

On this page 10 sections
  1. Medicare rate
  2. What 33416 covers
  3. By payment locality
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Similar codes
  8. Related codes
  9. Billing questions
  10. Sources

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

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

33416 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailable$1,722.74
AlaskaUnavailable$2,393.23
ArizonaUnavailable$1,847.03
ArkansasUnavailable$1,701.10
Atlanta, GAUnavailable$1,971.33
Austin, TXUnavailable$1,895.44
Bakersfield, CAUnavailable$1,850.45
Baltimore area, MDUnavailable$2,021.21
Beaumont, TXUnavailable$1,843.72
Brazoria, TXUnavailable$1,843.50

33416 rates by state

Office rate range in each state. Select a state to see its payment localities.

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Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

View every state and territory as a table
33416 office rate range by state
State / territoryOffice rate rangeLocalities
AKNo published base rate1
ALNo published base rate1
ARNo published base rate1
AZNo published base rate1
CANo published base rate29
CONo published base rate1
CTNo published base rate1
DCNo published base rate1
DENo published base rate1
FLNo published base rate3
GANo published base rate2
GUNo published base rate1
HINo published base rate1
IANo published base rate1
IDNo published base rate1
ILNo published base rate4
INNo published base rate1
KSNo published base rate1
KYNo published base rate1
LANo published base rate2
MANo published base rate2
MDNo published base rate3
MENo published base rate2
MINo published base rate2
MNNo published base rate1
MONo published base rate3
MSNo published base rate1
MTNo published base rate1
NCNo published base rate1
NDNo published base rate1
NENo published base rate1
NHNo published base rate1
NJNo published base rate2
NMNo published base rate1
NVNo published base rate1
NYNo published base rate5
OHNo published base rate1
OKNo published base rate1
ORNo published base rate2
PANo published base rate2
PRNo published base rate1
RINo published base rate1
SCNo published base rate1
SDNo published base rate1
TNNo published base rate1
TXNo published base rate8
UTNo published base rate1
VANo published base rate2
VINo published base rate1
VTNo published base rate1
WANo published base rate2
WINo published base rate1
WVNo published base rate1
WYNo published base rate1

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

Office or facility?

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

RuleCMS valueWhat it means
Global period090Major surgery: the day before, the day of, and 90 days after are included.
Multiple procedures2Standard reduction: highest-valued procedure at 100%, others at 50%.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)2Paid.
Co-surgeons (62)1Permitted with supporting documentation.
Team surgery (66)0Not permitted.
Professional/technical0Physician service: no professional/technical split.
Split (54/55/56)0.09/0.84/0.07Share 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.

  • 24Unrelated E/M visit by the same physician
  • 79Unrelated procedure (starts its own global period)
  • 58Staged, more extensive, or therapy procedure that was planned
  • 78Unplanned return to the operating room for a related complication
SurgeryVisit
Sep 23, 2026Jan 10, 2027

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%).

When to use modifier 51

33416 compared with similar codes

Compare codes · National

4 codes, side by side

Office or facility?

  • 33416

    Septal myectomy, ventricular muscle resection35.65 wRVU

    Not priced

  • 33415

    Subaortic resection, discrete subaortic stenosis36.34 wRVU

    Not priced

  • 33425

    Mitral valve repair, without prosthetic ring48.71 wRVU

    Not priced

  • 33405

    Aortic valve replacement, standard prosthetic valve40.29 wRVU

    Not priced

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.

Codes related to 33416

Related codes aren’t interchangeable: bill the code that matches the service performed.

Codes related to 33416
CodeHow it relatesNational office range
Used instead
33415Subaortic resection, discrete subaortic stenosisFor subaortic membrane excision when the obstruction is treated by removing membrane rather than ventricular muscle.No office rate
Often billed with
33425Mitral valve repair, without prosthetic ringMay accompany myectomy when a separately indicated mitral valve repair is performed in the same session.No office rate
33405Aortic valve replacement, standard prosthetic valveMay accompany myectomy when a separately indicated open aortic valve replacement is performed.No office rate

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
RVUs for 33416PPRRVU2026_Oct_nonQPP.csv, line 3,945 (RVU26D)

Open CMS sourceHow we calculate rates

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