CPT 88341Laboratory

Imhchem/imcytchm ea add antb

CPT 88341 covers additional immunohistochemistry or immunocytochemistry testing on tissue or cell samples, where special stains are applied to identify specific proteins or antigens beyond the first antibody test.

Showing rates for

National Average

Base Medicare rate

$93.48

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

0.56

PE RVU (NF)

2.32

MP RVU

0.01

Total RVU

2.89

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Always bill 88341 with primary code 88342 (first antibody stain) as 88341 is an add-on code and cannot be reported alone
Impact: Prevents automatic denial; ensures payment for both primary ($111.24) and each additional antibody ($93.48)
Report one unit of 88341 for each additional antibody beyond the first, regardless of how many tissue blocks are stained with the same antibody
Impact: Proper unit reporting prevents underbilling; a panel of 6 antibodies generates $93.48 × 5 = $467.40 in add-on revenue
Document each antibody type specifically in the pathology report (e.g., 'ER, PR, HER2, Ki-67') rather than generic 'IHC panel' to support medical necessity
Impact: Reduces audit risk and denial rate by 40-60% according to CAP guidelines; justifies multiple units billed
For reflex testing where additional antibodies are added based on initial results, ensure documentation clearly indicates clinical necessity and physician order
Impact: Supports medical necessity for payer review; prevents denials for 'not medically necessary' which account for 25% of IHC claim denials
Bill 88341 only once per antibody type per specimen, even if multiple slides or levels are stained; do not multiply units by number of slides
Impact: Prevents overbilling audits and recoupment; correct billing maintains compliance while maximizing legitimate $93.48 per unique antibody
For Medicare patients, verify LCD (Local Coverage Determination) requirements for specific antibody combinations and cancer types before performing non-standard panels
Prevents denials for non-covered antibodies; some LCDs limit reimbursement to 4-6 antibodies per case, affecting potential $93.48 per stain revenue

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 88341 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 88341 is $93.48 for both facility and non-facility settings. This rate is based on 2.89 total RVUs multiplied by the 2025 conversion factor of 32.3465.

Can CPT 88341 be billed alone without another code?

No, CPT 88341 is an add-on code and must always be billed with primary code 88342, which represents the first antibody stain. Billing 88341 alone will result in automatic claim denial.

How many units of 88341 can be billed per case?

You can bill one unit of 88341 for each additional antibody beyond the first. For example, if five antibodies are performed, bill 88342 once and 88341 four times. However, verify payer-specific LCD requirements as some limit the number of reimbursable antibodies per case.

What is the difference between CPT 88341 and 88342?

CPT 88342 represents the first immunohistochemistry antibody stain performed and reimburses at $111.24, while CPT 88341 represents each additional antibody stain beyond the first and reimburses at $93.48. Both codes are typically used together in antibody panel testing.

Do I need a separate order for each antibody to bill 88341?

While a single pathology order can cover multiple antibodies, documentation must clearly specify each individual antibody to be performed or support reflex testing protocols. The pathology report must detail each antibody stain performed and interpreted to justify multiple units of 88341.

Is prior authorization required for billing multiple units of 88341?

Prior authorization requirements vary by payer and cancer type. Medicare typically does not require prior authorization for standard antibody panels, but some Medicare Advantage and commercial payers may require pre-authorization when more than 4-6 antibodies are ordered. Always verify payer-specific policies.

What are the RVU values for CPT code 88341?

CPT 88341 has a work RVU of 0.56, practice expense RVU of 2.32 (both facility and non-facility), and malpractice RVU of 0.01, totaling 2.89 RVUs. These values are multiplied by the 2025 conversion factor of 32.3465 to determine the $93.48 reimbursement.