C1733 — Catheter, electrophysiology, diagnostic/ablation, other than 3d or vector mapping, other than cool-tip
C1733 is a HCPCS Level II code for catheter, electrophysiology, diagnostic/ablation, other than 3d or vector mapping, other than cool-tip. It belongs to the Outpatient Prospective Payment System section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Special coverage instructions apply
There are published conditions attached to this code. Check the applicable coverage policy before billing it: the code being valid is not the same as the service being covered.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Medically Unlikely Edits — units per day
The most units of C1733 Medicare will pay on one date of service. Bill more on a single line and it is denied. The limit is not the same in every setting, so the row that matters is the one matching the claim you are building.
- practitioner
- 3 units MAI 3 — Date of Service Edit: Clinical · Clinical: CMS Workgroup
- outpatient
- 3 units MAI 3 — Date of Service Edit: Clinical · Clinical: Data
The adjudication indicator decides whether exceeding the limit is worth appealing at all: MAI 1 is a line edit you can support with documentation, MAI 3 is a date-of-service edit that is also appealable, and MAI 2 is absolute — no documentation overrides it. CMS MUE 2026Q3.
The CMS record for C1733
- Long descriptor
- Catheter, electrophysiology, diagnostic/ablation, other than 3d or vector mapping, other than cool-tip
- Short descriptor
- Cath, ep, othr than cool-tip
- Added
- April 1, 2001
- BETOS
- D1A
- Pricing indicator
- 53 — Other
The official wording. This is what the code means.
CMS's 28-character form, which is what shows up on a remittance advice.
When CMS introduced the code.
Berenson-Eggers Type of Service — CMS's own analytic grouping.
Statute.
Codes adjacent to C1733
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If C1733 is not quite right, the correct code is very often within a few positions of it.
- C1725Catheter, transluminal angioplasty, non-laser (may include guidance, infusion/perfusion capability)
- C1726Catheter, balloon dilatation, non-vascular
- C1727Catheter, balloon tissue dissector, non-vascular (insertable)
- C1728Catheter, brachytherapy seed administration
- C1729Catheter, drainage
- C1730Catheter, electrophysiology, diagnostic, other than 3d mapping (19 or fewer electrodes)
- C1731Catheter, electrophysiology, diagnostic, other than 3d mapping (20 or more electrodes)
- C1732Catheter, electrophysiology, diagnostic/ablation, 3d or vector mapping
- C1734Orthopedic/device/drug matrix for opposing bone-to-bone or soft tissue-to bone (implantable)
- C1735Catheter(s), intravascular for renal denervation, radiofrequency, including all single use system components
- C1736Catheter(s), intravascular for renal denervation, ultrasound, including all single use system components
- C1737Joint fusion and fixation device(s), sacroiliac and pelvis, including all system components (implantable)
- C1738Powered, single-use (i.e. disposable) endoscopic ultrasound-guided biopsy device
- C1739Tissue marker, uniquely detectable and identifiable with probe/sensor, any method (implantable), with delivery system
- C1740Leadless electrode, transmitter, battery (all implantable), for sequential left ventricular pacing
- C1741Anchor/screw for bone fixation, absorbable, metallic (implantable)
Questions about C1733
What is HCPCS code C1733?
C1733 is a HCPCS Level II code for catheter, electrophysiology, diagnostic/ablation, other than 3d or vector mapping, other than cool-tip. It sits in the Outpatient Prospective Payment System section.
Does Medicare cover C1733?
The CMS HCPCS file marks C1733 as "Special coverage instructions apply". There are published conditions attached to this code. Check the applicable coverage policy before billing it: the code being valid is not the same as the service being covered.