CPT 88187Laboratory

Flowcytometry/read 2-8

CPT 88187 covers the professional interpretation of flow cytometry tests using 2-8 cellular markers, a lab technique that analyzes specific characteristics of cells to help diagnose blood cancers, immune disorders, and other conditions.

Showing rates for

National Average

Base Medicare rate

$34.29

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

0.74

PE RVU (NF)

0.29

MP RVU

0.03

Total RVU

1.06

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

NCCI bundling edits

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Billing tips

Accurately count and document the exact number of markers used; billing 88187 for 9+ markers constitutes undercoding while billing it for a single marker is overcoding
Impact: Incorrect marker count is the #1 audit trigger; proper coding between 88184, 88187, and 88188 can affect reimbursement by $20-100+ per case
Document each marker/antibody used by specific name (CD3, CD4, CD19, etc.) in the interpretation report, not just the total count
Impact: Auditors routinely request marker-specific documentation; vague reports result in 40-60% of post-payment denials
Bill per specimen analyzed, not per marker; multiple markers on one specimen equals one unit of 88187
Impact: Billing multiple units for single specimen analysis will trigger immediate denial and potential fraud investigation
When performing flow cytometry on multiple specimens from the same patient on the same day, append modifier 59 or use separate line items with anatomic site modifiers if available
Impact: Prevents automatic denial of second specimen as duplicate; can recover $34.29 per additional valid specimen
Coordinate with referring physicians to ensure medical necessity is clearly documented in the order and patient record before performing the test
Impact: Pre-service medical necessity verification reduces claim denials by approximately 25% and eliminates costly write-offs
For Medicare patients, verify LCD and NCD requirements for your MAC jurisdiction as coverage criteria for flow cytometry vary by region
Impact: LCD non-compliance can result in 100% payment denial; proactive verification prevents average loss of $34.29 per denied claim

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 88187 in 2025?

The 2025 Medicare national average payment rate for CPT 88187 is $34.29 for both facility and non-facility settings. This is based on a total RVU of 1.06 (0.74 work RVU, 0.29 practice expense RVU, 0.03 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

How many markers are covered under CPT code 88187?

CPT 88187 covers flow cytometry interpretation with 2 to 8 cellular markers. If only 1 marker is used, report 88184 instead. If 9 to 15 markers are used, report 88188. For 16 or more markers, use 88189.

Can I bill CPT 88187 for multiple specimens from the same patient on the same day?

Yes, you can bill 88187 for each separate specimen analyzed (such as bone marrow and peripheral blood), but you must append modifier 59 or another appropriate modifier to indicate distinct procedural services and provide clear documentation of each separate specimen source to avoid duplicate denials.

What is the difference between CPT 88187 and 88188?

The difference is the number of markers analyzed: CPT 88187 covers 2-8 markers while CPT 88188 covers 9-15 markers. The marker count determines which code to use, and accurate documentation of each specific marker is essential for proper code selection and audit defense.

Do I need modifier 26 when billing CPT 88187?

Use modifier 26 only when billing the professional component (interpretation) separately from the technical component. If your facility performs both the technical work and interpretation, bill the global service without modifier 26. If you only interpret results from specimens processed elsewhere, append modifier 26.

What diagnosis codes support medical necessity for CPT 88187?

Common supporting diagnoses include suspected or confirmed leukemias (C91-C95), lymphomas (C81-C85), abnormal blood counts (D69-D75), immunodeficiency disorders (D80-D84), and other hematologic disorders requiring immunophenotyping. Always verify your Medicare MAC's Local Coverage Determination for specific ICD-10 requirements.

How should I document the markers used for CPT 88187 to prevent denials?

List each marker by specific name (CD3, CD4, CD8, CD19, CD20, etc.) in your flow cytometry report, clearly state the total count (which must be 2-8), and include interpretive findings for each marker analyzed. Vague documentation like 'multiple markers' or 'standard panel' is insufficient and will likely result in denial upon audit.