C2637 — Brachytherapy source, non-stranded, ytterbium-169, per source
C2637 is a HCPCS Level II code for brachytherapy source, non-stranded, ytterbium-169, per source. 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 C2637 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
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · Drug discontinued
- outpatient
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · Drug discontinued
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 C2637
- Long descriptor
- Brachytherapy source, non-stranded, ytterbium-169, per source
- Short descriptor
- Brachy,non-str,ytterbium-169
- Added
- October 1, 2005
- BETOS
- I4B
- 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 C2637
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If C2637 is not quite right, the correct code is very often within a few positions of it.
- C2627Catheter, suprapubic/cystoscopic
- C2628Catheter, occlusion
- C2629Introducer/sheath, other than guiding, other than intracardiac electrophysiological, laser
- C2630Catheter, electrophysiology, diagnostic/ablation, other than 3d or vector mapping, cool-tip
- C2631Repair device, urinary, incontinence, without sling graft
- C2634Brachytherapy source, non-stranded, high activity, iodine-125, greater than 1.01 mci (nist), per source
- C2635Brachytherapy source, non-stranded, high activity, palladium-103, greater than 2.2 mci (nist), per source
- C2636Brachytherapy linear source, non-stranded, palladium-103, per 1 mm
- C2638Brachytherapy source, stranded, iodine-125, per source
- C2639Brachytherapy source, non-stranded, iodine-125, per source
- C2640Brachytherapy source, stranded, palladium-103, per source
- C2641Brachytherapy source, non-stranded, palladium-103, per source
- C2642Brachytherapy source, stranded, cesium-131, per source
- C2643Brachytherapy source, non-stranded, cesium-131, per source
- C2644Brachytherapy source, cesium-131 chloride solution, per millicurie
- C2645Brachytherapy planar source, palladium-103, per square millimeter
Questions about C2637
What is HCPCS code C2637?
C2637 is a HCPCS Level II code for brachytherapy source, non-stranded, ytterbium-169, per source. It sits in the Outpatient Prospective Payment System section.
Does Medicare cover C2637?
The CMS HCPCS file marks C2637 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.