CPT 88358Laboratory

Analysis tumor

CPT 88358 covers computer-assisted analysis of tumor characteristics using specialized imaging technology to measure and assess tumor cells from tissue samples.

Showing rates for

National Average

Base Medicare rate

$130.68

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

0.95

PE RVU (NF)

3.06

MP RVU

0.03

Total RVU

4.04

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

NCCI bundling edits

Loading bundling edits…

Billing tips

Verify the morphometric analysis uses computer-assisted technology rather than manual counting or visual estimation, as only computerized quantitative analysis qualifies for 88358
Impact: Prevents 100% claim denial and potential fraud allegations; manual methods require different coding
Document the specific morphometric parameters measured (e.g., nuclear area, chromatin density, architectural features) and the computer system used in the pathology report
Impact: Reduces denial rate by 40-60% and supports medical necessity during audits
Bill 88358 only once per tumor site analyzed, regardless of the number of parameters measured or images analyzed from that site
Impact: Prevents overbilling denials; multiple tumor sites may justify separate units with modifier 59/XU and documentation
Ensure the morphometric analysis is ordered separately or documented as medically necessary beyond routine pathologic examination (88305-88309)
Impact: Establishes medical necessity and prevents bundling denials with surgical pathology codes, protecting the full $130.68 reimbursement
When billing with special stains or immunohistochemistry, verify payer-specific policies on bundling as some payers consider morphometric analysis inclusive
Impact: Proactive policy review prevents $130.68 denial or recoupment on 20-30% of claims with complex staining
For Medicare, confirm the morphometric analysis meets LCD/NCD requirements for the specific tumor type and clinical indication before performing
Impact: Prevents medical necessity denials; some tumor types have limited coverage resulting in potential $130.68 write-off per case

Live Field Datano reports yet

Real billers contribute denial patterns and appeal strategies for this code. Once 5+ reports come in, you’ll see live aggregated data here — the only place this exists, free.

Working with CPT 88358?

Get the free Revenue Protection Toolkit — the denial triggers, modifier pitfalls, and bundling conflicts that quietly cost you reimbursement. Instant download.

Help build the field knowledge

MedPayIQ gets smarter as billers contribute. If you've had this code denied, share what happened so others learn from it. Anonymous, no patient info.

Related actions

Frequently asked questions

What is the Medicare reimbursement rate for CPT 88358 in 2025?

The 2025 Medicare national average reimbursement for CPT 88358 is $130.68 for both facility and non-facility settings, based on 4.04 total RVUs and the 32.3465 conversion factor from the CMS Physician Fee Schedule.

Can CPT 88358 be billed with surgical pathology codes 88305-88309?

Yes, CPT 88358 can be billed separately from surgical pathology codes when the morphometric analysis represents a distinct computer-assisted quantitative service beyond routine microscopic examination. However, medical necessity must be documented, and some payers have bundling edits requiring modifier 59 or XU with supporting documentation.

What is the difference between CPT 88358 and manual cell counting?

CPT 88358 specifically requires computer-assisted technology for quantitative morphometric analysis, while manual cell counting or visual estimation does not qualify. The code mandates use of computerized image analysis systems that objectively measure cellular and nuclear parameters with numerical output.

How many times can CPT 88358 be billed per patient encounter?

CPT 88358 is typically billed once per tumor site or specimen analyzed. Multiple units may be justified when analyzing morphometrically distinct tumor sites with separate specimens, but require modifier 59 or XU and detailed documentation explaining medical necessity for analyzing each site separately.

What documentation is required to support billing CPT 88358?

Required documentation includes explicit statement of computer-assisted analysis, identification of the image analysis system used, specific morphometric parameters measured with quantitative results, pathologist interpretation, clinical correlation, and evidence of separate medical necessity beyond routine pathologic examination.

Do I need prior authorization for CPT 88358?

Prior authorization requirements vary by payer and clinical indication. Many commercial payers require prior authorization for morphometric analysis, particularly for tumor types without established morphometry guidelines. Always verify payer-specific policies before performing the analysis to avoid denials.

What are the Work RVUs and Practice Expense RVUs for CPT 88358?

CPT 88358 has 0.95 Work RVUs, 3.06 Practice Expense RVUs (both facility and non-facility), and 0.03 Malpractice RVUs, totaling 4.04 RVUs in the 2025 Medicare Physician Fee Schedule.