CPT 88372Laboratory

Protein analysis w/probe

CPT 88372 covers laboratory protein analysis using a probe technique to identify specific proteins in tissue samples. This specialized test helps doctors diagnose diseases like cancer by detecting specific protein markers.

Showing rates for

National Average

Base Medicare rate

$17.14

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

0.37

PE RVU (NF)

0.15

MP RVU

0.01

Total RVU

0.53

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

NCCI bundling edits

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Billing tips

Bill each individual antibody or probe as a separate unit of 88372 rather than bundling multiple stains
Impact: Each probe billed separately generates $17.14 per marker; a 5-marker panel yields $85.70 versus single-line billing
Document the specific antibody clone, dilution, and retrieval method used for each probe in the pathology report
Impact: Detailed technical documentation reduces audit risk and supports medical necessity for multiple markers, preventing estimated 30-40% denial rate
Verify LCD/NCD coverage for specific protein markers with diagnosis code combinations before performing test
Impact: Medicare LCDs restrict certain markers to specific diagnoses; pre-verification prevents $17.14 write-off per non-covered marker
Link each 88372 line item to the most specific ICD-10 code justifying that particular marker
Impact: Specific diagnosis linkage supports medical necessity; generic codes increase denial probability by 25-35%
Ensure 88372 is billed in addition to, not instead of, base surgical pathology codes (88302-88309)
Impact: 88372 is an add-on service to tissue examination codes; missing base code results in 100% denial of immunostain charges
Use current year HCPCS codes for any automated or specialized protein analysis platforms rather than default 88372
Impact: Specialized platforms may have higher-paying HCPCS codes; verify annually to avoid undercoding by $5-15 per test

Common denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 88372 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 88372 is $17.14 for both facility and non-facility settings, based on 0.53 total RVUs and a conversion factor of 32.3465.

How many times can I bill CPT 88372 for the same patient on the same day?

You can bill 88372 multiple times per day for the same patient when different antibody probes are used, each representing a distinct protein analysis. Each probe should be billed as a separate line item with appropriate documentation of medical necessity and specific antibody identification.

What is the difference between CPT 88342 and 88372?

CPT 88342 covers immunohistochemistry with cell marker study per specimen initial single antibody stain, while 88372 is used for each additional single antibody stain on the same specimen. The codes are often billed together, with 88342 for the first stain and 88372 for each subsequent marker.

Do I need a base surgical pathology code to bill 88372?

Yes, 88372 is an add-on service that requires a base surgical pathology examination code (88302-88309 series) to be billed on the same claim. Billing 88372 alone without a tissue examination code will result in denial.

What documentation is required to support billing CPT 88372?

Documentation must include the specific antibody or probe name, specimen source, antigen retrieval method if used, control results, staining pattern and intensity, clinical indication for the marker, and pathologist interpretation. The pathology report should demonstrate medical necessity for each marker billed.

Are there Medicare coverage limitations for CPT 88372?

Yes, Medicare Local Coverage Determinations (LCDs) restrict specific protein markers to certain diagnoses. Coverage varies by MAC jurisdiction, with specific requirements for tumor marker panels, number of markers allowed per specimen type, and approved marker-diagnosis combinations that must be verified before testing.

Can CPT 88372 be billed with modifier 26 for professional component only?

While modifier 26 technically can be appended, 88372 is primarily a technical component code with minimal professional component value (0.37 work RVU). Most billing is for the complete service without component splitting, as the total Medicare payment is only $17.14 regardless of setting.