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Billing code 33741: Atrial septostomyMedicare rate & RVUs

Reports catheter-based creation or enlargement of an atrial communication to address a congenital cardiac anomaly, such as inadequate mixing in transposition of the great arteries.

CMS RVU26DEffective Oct 1, 2026109 payment localities45 Medicare services in 2024

Medicare pays $649.65 for 33741 nationally in a facility.

Medicare rate · 33741

Atrial septostomy

Swap in your local Medicare rate.

Work RVUs
13.65
Total RVUs
19.45
Global days
000

National rate · 2026

$649.65

Facility setting, before claim adjustments.

See every locality for 33741 → · 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.

On this page 10 sections
  1. Medicare rate
  2. What 33741 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 33741 covers

A congenital interventional cardiologist performs this catheter-based procedure to create or enlarge an opening between the atria when a congenital heart defect makes that communication clinically necessary. A classic setting is transposition of the great arteries with inadequate mixing between the pulmonary and systemic circulations. The procedure is performed in a cardiac catheterization setting; imaging guidance, when performed, is included in the service.

Report 33741 for the atrial septostomy itself, rather than for creation of a different type of congenital cardiac shunt. The operative or catheterization report should identify the congenital anomaly, the atrial communication treated, and the intervention performed. The code has a 0-day global period, so same-day preoperative and postoperative care is included. When multiple procedures occur in the same session, the highest-valued procedure is paid in full and other procedures are subject to the standard multiple-procedure reduction. Modifier 50 is inappropriate for this service. An assistant at surgery may be paid; co-surgeons and team surgery 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 33741 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

33741 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailable$591.79
Alaska*Unavailable$834.23
ArizonaUnavailable$631.34
ArkansasUnavailable$584.88
AtlantaUnavailable$674.26
AustinUnavailable$643.07
BakersfieldUnavailable$623.88
Baltimore/Surr. CntysUnavailable$688.94
BeaumontUnavailable$634.28
BrazoriaUnavailable$628.58

33741 rates by state

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

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

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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
33741 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 33741 rate is calculated

Each of 33741’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 · 33741

RVUs × geographic indexes × conversion factor

Swap in your local Medicare rate.

Work 13.65Practice expense 2.54Malpractice 3.26

19.4500 adjusted RVUs×$33.4009 conversion factor=$649.65

All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.

Payment rules and modifiers for 33741

The CMS indicators that decide how 33741 is paid alongside other services.

CMS payment indicators · 33741

Atrial septostomy

RuleCMS valueWhat it means
Global period000Same-day global: pre- and post-op care on the day of the procedure is 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)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical0Physician service: no professional/technical split.

What modifiers do to the payment

Modifier 51 · payment effect

With and without the modifier

33741 without 51 · national facility

$649.65

Atrial septostomy

33741-51 · Second procedure: 50%

$324.83

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

33741 compared with similar codes

Compare codes

33741 vs 33745 vs 33746: national Medicare rates

Swap in your local Medicare rate.

  • 33741
    Atrial septostomy · 13.65 wRVU
    —
  • 33745
    Intracardiac shunt · 19.5 wRVU
    —
  • 33746
    Intracardiac shunt · 7.8 wRVU
    —

How to choose

33745Intracardiac shunt
33741 is for transcatheter atrial septostomy. 33745 is for transcatheter treatment involving creation of a congenital cardiac shunt.
33746Intracardiac shunt
33746 describes additional congenital cardiac shunt treatment. It is not an additional-unit code for atrial septostomy under 33741.

Codes related to 33741

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

Codes related to 33741
CodeHow it relatesNational office range
Used instead
33745Intracardiac shuntDescribes transcatheter treatment involving creation of a congenital cardiac shunt rather than an atrial septostomy.No office rate
33746Intracardiac shuntDescribes additional congenital cardiac shunt treatment, not an additional atrial septostomy.No office rate

33741 billing questions

When should 33741 be reported instead of 33745?

Use 33741 for transcatheter atrial septostomy addressing a congenital cardiac anomaly. Code 33745 describes treatment involving creation of a congenital cardiac shunt, rather than an atrial septostomy.

Is imaging guidance separately reported with 33741?

Imaging guidance performed as part of the atrial septostomy is included in 33741.

Does 33741 have a postoperative global period?

It has a 0-day global period. Same-day preoperative and postoperative care is included.

Can modifier 50 be used?

No. Modifier 50 is inappropriate for this service based on its descriptor and anatomy.

Can an assistant or co-surgeon be reported?

An assistant at surgery may be paid. Co-surgeons and team surgery are not permitted for 33741.

How are other procedures in the same session paid?

The highest-valued procedure is paid in full, and other procedures performed in the same session are subject to the standard multiple-procedure reduction.

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 33741PPRRVU2026_Oct_nonQPP.csv, line 4,048 (RVU26D)

Open CMS sourceHow we calculate rates

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