CPT 88373Laboratory

M/phmtrc alys ishquant/semiq

CPT 88373 covers morphometric analysis, a specialized laboratory technique that uses computerized or semi-automated methods to measure and analyze tissue characteristics in pathology specimens, such as counting cells or measuring protein markers in cancer tissue.

Showing rates for

National Average

Base Medicare rate

$63.72

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

0.58

PE RVU (NF)

1.38

MP RVU

0.01

Total RVU

1.97

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

NCCI bundling edits

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Billing tips

Bill 88373 per each single analyte or marker analyzed, not per tissue block or slide
Impact: Correct unit billing can increase revenue by 200-300% when multiple markers are quantified (e.g., ER, PR, and Ki-67 each warrant separate 88373 codes totaling $191.16)
Document the specific morphometric method used (manual point counting, computer-assisted image analysis system, automated scoring platform) and the parameter measured
Impact: Reduces denial rate by approximately 35-40% by demonstrating quantitative methodology beyond routine microscopic examination
Ensure the pathology report explicitly states quantitative results (e.g., '15% of tumor cells positive' or 'H-score of 240') rather than qualitative descriptors
Impact: Numerical reporting supports medical necessity and reduces audit recoupment risk; qualitative-only reports may result in $63.72 denial per code
Do not bill 88373 on the same date as 88360-88361 (tumor immunohistochemistry) for the same analyte unless distinct separate methodology is used
Impact: Prevents bundling denials that would result in $63.72 loss per inappropriately billed code; proper sequencing maintains both payments
Link to appropriate diagnosis codes documenting medical necessity for quantitative analysis (e.g., breast cancer with treatment selection needs, uncertain proliferation index)
Impact: Prevents medical necessity denials; cancer diagnosis codes with treatment decision context improve approval rate by 25-30%
When splitting professional and technical components between different billing entities, ensure coordination to prevent duplicate global billing

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 88373 in 2025?

The 2025 Medicare national average reimbursement for CPT 88373 is $63.72 for both facility and non-facility settings. This rate is based on 1.97 total RVUs multiplied by the 2025 conversion factor of 32.3465.

Can CPT 88373 be billed multiple times on the same date of service?

Yes, CPT 88373 can be billed multiple times on the same date when morphometric analysis is performed on different analytes or markers (e.g., separate quantification of ER, PR, and Ki-67). Each distinct morphometric analysis should be reported separately with appropriate documentation. Use modifier 59 or XU if needed to demonstrate distinct services.

What is the difference between CPT 88373 and immunohistochemistry codes 88360-88361?

CPT 88360-88361 cover the performance and qualitative interpretation of immunohistochemistry staining, while 88373 specifically represents quantitative or semi-quantitative morphometric analysis of the stained tissue. 88373 requires documented numerical measurement (percentages, counts, scores) using manual counting, computer-assisted, or automated methods, not just visual assessment.

How many RVUs is CPT code 88373 worth?

CPT 88373 has a total RVU value of 1.97 for 2025, consisting of 0.58 work RVUs, 1.38 practice expense RVUs (both facility and non-facility), and 0.01 malpractice RVUs.

What documentation is required to bill CPT 88373 without denials?

Required documentation includes the specific morphometric method used, quantitative numerical results (not qualitative descriptors), the parameter measured, number of fields/cells analyzed, pathologist interpretation, and medical necessity justification. The pathology report must clearly demonstrate that quantitative analysis was performed beyond routine microscopic examination.

Do I need modifier 26 or TC when billing CPT 88373?

Use modifier 26 when billing only the professional component (pathologist interpretation) and modifier TC when billing only the technical component (equipment, supplies, technician work). If your facility performs both components, bill the code globally without a modifier. Split billing is common when specimens are sent to reference laboratories.

What are common reasons for CPT 88373 claim denials?

Common denials include bundling with immunohistochemistry codes when quantitative methodology is not documented, medical necessity issues when diagnosis doesn't support quantitative analysis, lack of documentation showing morphometric analysis was actually performed, and duplicate service denials when multiple units are billed without adequate distinction between analytes.