Is the lab bill for a skin biopsy covered by insurance?
Usually yes. The tissue exam is part of the diagnosis, so most plans cover it, and it arrives as a second bill weeks after the visit. Code 88305 is the pathologist's look at the sample under a microscope, one line for each specimen sent. The surprise is rarely coverage. It is the deductible and whether the lab was in network.
Usually
Covered, but billed by the lab
One per specimen
Three spots sampled means three units of 88305, each with its own patient share. One appointment, one statement, three lines.
Weeks behind
The lab's bill lands well after the visit is forgotten. Warning the patient at checkout is what prevents the angry phone call.
Network mismatch
The office can be in network while the lab reading the sample is not. The patient pays the difference and blames the practice.
Not free lab work
Routine blood work often carries no patient share, but this exam is billed on the physician side, so deductible and coinsurance usually apply. One check shows what is left.
What would a real check show for this patient's 88305?
Pick a sample plan and type your per-specimen fee. This is the visibility a real-time check gives the desk for every actual patient, in under a second.
Eligibility readout · 88305
Sample- Coverage
- Active, deductible satisfied, lab in network
- Frequency
- One unit per specimen, no limit
- Patient share
- Type your fee to see it
Estimate from a sample plan. A real check reads the actual plan in under a second.
When 88305 is the right code
- Tissue taken in the office is sent out
- A pathologist examines it under a microscope
- One unit for each separate specimen jar
- Skin biopsies and most excisions land here
Documentation payers expect
Each specimen needs its own label, site, and clinical history on the requisition. Simpler tissue, such as a skin tag or a plain cyst, belongs on 88304 instead, and payers do recode it.
Why pathology bills get denied or disputed
What happens after the lab reads it
The result drives the next code. Benign usually means a follow up visit, while cancer means an excision or Mohs surgery, each a bigger bill. If the pathologist needs a special stain, 88342 appears as another line on the same lab statement. A recheck of the same site starts the cycle again with a new sample. Practices that pull the plan and the deductible before the biopsy can warn patients about the second bill on the day it happens, not after.
88305, quick answers
Is the pathology bill covered by insurance?
Usually yes. The tissue exam is diagnostic care, so most plans cover 88305 the same way they cover the biopsy itself.
Why did I get a bill from a lab I never visited?
The sample was sent to a pathologist who bills separately. One appointment and two bills is the normal pattern.
Does Medicare cover 88305?
Yes. Unlike routine blood work, which often carries no patient share, the pathologist's read is billed on the physician side, so the usual 20% applies after the Part B deductible.
Can the lab be out of network when my dermatologist is in network?
Yes, and it happens often. The plan's lab benefit is the only place that answer shows up before the bill does.
How many units will I be charged for?
One for each separate specimen. Three biopsies in one visit typically means three units of 88305.
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Related: 88304 · 88342 · 11102
CPT is a registered trademark of the American Medical Association. This page is Valian's own plain-English summary for front-desk teams, not official CPT descriptor text, and is not billing or clinical advice. Coverage patterns are common plan behaviors; every plan differs. Verify benefits before the visit.