How a $3,240 Test Becomes Incidental to a $207 Biopsy

Medicare pays $3,240.00 for the heart transplant rejection test and $206.68 to the physician who takes the biopsy.

Starting January 1, Aetna treats the $3,240 one as incidental to the $206.68 one.

The article is on the single page Aetna published as its October OfficeLink Updates, under the heading "Allograft rejection testing performed with biopsy procedures." The scope line is one sentence: "This applies to Medicare lines of business."

So this is an Aetna Medicare Advantage edit, and the effective date is January 1, 2027.

Two Code Pairs and a Date

On the heart side, CPT 81595 "will be denied as incidental when billed on the same date of service as" 93505, endomyocardial biopsy. That is the whole pairing.

On the kidney side, HCPCS 0540U gets denied against four codes: 50200 percutaneous kidney biopsy, 50205 open kidney biopsy, 50542 laparoscopic ablation of a renal mass, and 93505 again.

Aetna's own affected-codes list calls 0540U the "Kidney allograft rejection assessment test," which is where the pairing looks like a mistake and is not one. The AMA descriptor for 0540U names no organ at all: quantification of donor-derived cell-free DNA by next-generation sequencing, reported as a percentage to determine probability of rejection. It is an organ-agnostic dd-cfDNA code, which is exactly why a heart biopsy belongs on its list and a kidney label does not.

Here is the price gap the word "incidental" is doing work across (chart below).

The test is 15.7x the heart biopsy's physician fee and 23.2x the kidney needle biopsy's. Against the open biopsy it is 8.1x, and against the laparoscopic code 3.2x.

The facility gets paid separately on its own side of the claim, so the ratio here is professional fee to lab fee. The direction does not change.