CPT 88314Laboratory

Histochemical stains add-on

CPT 88314 covers additional special staining procedures performed on tissue samples in the laboratory to help diagnose diseases like cancer, infections, or other abnormalities that standard staining cannot detect.

Showing rates for

National Average

Base Medicare rate

$83.13

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

0.45

PE RVU (NF)

2.09

MP RVU

0.03

Total RVU

2.57

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

NCCI bundling edits

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Billing tips

Always bill 88314 in conjunction with a primary surgical pathology code (88302-88309) or consultation code (88321-88325) as it is an add-on code and cannot be billed alone
Impact: Prevents automatic denial; 100% claim rejection rate when billed without primary code
Report one unit of 88314 for each additional histochemical stain beyond the first stain; if ordering 4 different stains, bill 88314 x 3 units with the primary stain included in the base pathology code
Impact: Correct unit reporting captures full revenue; underbilling by 1-3 units per case results in average revenue loss of $83-$249 per specimen
Document the specific stain name (e.g., Trichrome, PAS, Iron) and clinical indication in the pathology report to support medical necessity for each stain ordered
Impact: Reduces denial rate by approximately 35-40% and strengthens appeal success rate to over 80%
Verify that reflex or automatic staining protocols are clinically justified and documented; payers increasingly scrutinize standing orders for multiple stains without specific diagnostic questions
Impact: Prevents medical necessity denials that affect 15-25% of multi-stain claims in audit-prone scenarios
Bill 88314 on the date the stain is performed and interpreted, not the date of specimen collection; ensure date of service matches pathology report date
Impact: Aligns with Medicare timely filing requirements and prevents 5-10% of claims from date-related denials
When splitting professional and technical components between entities, ensure coordination to prevent duplicate billing or missing components that could trigger audits

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Frequently asked questions

What is CPT code 88314 used for in pathology billing?

CPT 88314 is an add-on code used to bill for each additional histochemical stain performed on tissue specimens beyond routine H&E staining. It covers special stains like Trichrome, PAS, Iron, Congo Red, and other chemical-based staining techniques that highlight specific tissue components for diagnostic purposes. It must be billed with a primary surgical pathology code and reimburses at $83.13 under 2025 Medicare rates.

How much does Medicare pay for CPT 88314 in 2025?

Medicare pays $83.13 for CPT 88314 in 2025 based on the national average non-facility rate. This reimbursement is the same for both facility and non-facility settings. The code has a total RVU value of 2.57, calculated from 0.45 work RVU, 2.09 practice expense RVU, and 0.03 malpractice RVU, multiplied by the 2025 conversion factor of 32.3465.

Can CPT 88314 be billed alone or does it require another code?

CPT 88314 cannot be billed alone as it is an add-on code designated by the '+' symbol in CPT. It must always be billed with a primary surgical pathology examination code (88302-88309) or pathology consultation code (88321-88325). Billing 88314 without a primary code will result in automatic claim denial.

How many units of 88314 can be billed for multiple special stains?

You can bill one unit of 88314 for each additional histochemical stain beyond the first stain. For example, if a pathologist performs four different special stains on one specimen, you would bill three units of 88314 (the first stain is included in the primary pathology code). When billing multiple units, use modifier 59 or XU to indicate distinct procedures and prevent bundling denials.

What is the difference between CPT 88314 and 88342 for tissue staining?

CPT 88314 covers histochemical stains that use chemical reactions to highlight tissue components, while CPT 88342 covers immunohistochemistry (IHC) staining using antibodies to detect specific proteins. Histochemical stains (88314) include PAS, Trichrome, and Iron stains at $83.13 per stain. IHC stains (88342) are more complex, antibody-based techniques with higher reimbursement and different clinical applications for identifying cell markers and proteins.

What documentation is required to bill CPT 88314 and avoid denials?

Required documentation includes a pathology report listing each specific histochemical stain by name, the clinical indication justifying each stain, separate interpretation of findings for each stain, pathologist signature, and date of service. Medical necessity must be clearly established, especially when billing multiple units. Laboratory worksheets showing actual staining procedures and correlation with the final diagnosis strengthen documentation and reduce audit risk.

What are common denial reasons for CPT 88314 and how can they be prevented?

Common denials include billing without a primary pathology code, lack of medical necessity documentation for multiple stains, missing modifiers when billing multiple units, and bundling with the primary surgical pathology code. Prevent denials by always pairing 88314 with appropriate primary codes, documenting specific clinical indications for each stain, using modifier 59 or XU for multiple units, and maintaining detailed pathology reports that justify each special stain ordered.