CPT 88321Laboratory

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CPT 88321 covers a pathologist's consultation and written report when examining microscope slides that were prepared at a different laboratory or facility. This is commonly used for second opinions or specialized diagnostic reviews.

Showing rates for

National Average

Base Medicare rate

$93.80

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

1.63

PE RVU (NF)

1.2

MP RVU

0.07

Total RVU

2.9

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

NCCI bundling edits

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Billing tips

Document that slides were prepared at an outside facility with specific reference to the originating laboratory name, case number, and date of original preparation
Impact: Prevents denials worth $93.80 per claim; most common reason for 88321 rejection is insufficient proof slides came from elsewhere
Ensure a separate written consultation report is generated and maintained in the medical record, not just an addendum to the original pathology report
Impact: Required for medical necessity documentation; failure to provide formal report can result in 100% payment denial and potential recoupment
Bill 88321 only once per consultation regardless of the number of slides reviewed; the code is per consultation, not per slide
Impact: Prevents overbilling and audit triggers; billing per slide instead of per consultation case can result in overpayment recoupment averaging $281.40+ for 3-4 slides incorrectly billed separately
Do not bill 88321 with primary specimen examination codes (88302-88309) for the same specimen; these are mutually exclusive
Impact: Unbundling edits will deny the consultation code; can trigger -$93.80 adjustment and compliance review
Verify that the requesting physician ordered a formal consultation, not just slide review for educational purposes or quality assurance
Impact: Non-billable slide reviews account for 15-20% of 88321 denials; clear consultation request documentation protects $93.80 per case
For facility billing, recognize the $14.55 rate difference between non-facility ($93.80) and facility ($79.25) settings and bill with appropriate place of service code

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 88321 in 2025?

The 2025 Medicare national average reimbursement for CPT 88321 is $93.80 for non-facility settings and $79.25 for facility settings. Actual payment may vary by locality based on geographic practice cost indices (GPCI).

Can CPT 88321 be billed for slides prepared in the same hospital system?

No, CPT 88321 requires that slides were prepared at a different facility or laboratory. If slides are prepared within the same healthcare system or hospital, even at a different campus, this typically does not meet the 'prepared elsewhere' requirement and primary examination codes (88302-88309) should be used instead.

How many times can you bill 88321 for reviewing multiple slides from the same case?

CPT 88321 is billed once per consultation case regardless of the number of slides reviewed. The code represents the pathologist's consultation service for the entire case, not a per-slide charge. Billing multiple units for one consultation case is considered incorrect coding.

What is the difference between CPT 88321 and 88323?

CPT 88321 is for consultation on slides prepared elsewhere, while 88323 is for consultation on material referred from another source requiring preparation and interpretation. 88323 involves receiving tissue or specimens that require processing into slides, whereas 88321 involves reviewing already-prepared slides.

Do you need a written consultation request to bill CPT 88321?

Yes, documentation should include evidence of a formal consultation request from the referring physician. This establishes medical necessity and distinguishes billable consultations from non-billable educational reviews or informal opinions. The request should state the clinical question or reason for consultation.

Can CPT 88321 be billed with modifier 26 for professional component?

CPT 88321 is inherently a professional component service representing the pathologist's interpretation and report. Modifier 26 is rarely appropriate and may cause confusion or denials. The code does not have a separate technical component in typical use.

What documentation is needed to prove slides came from an outside facility for CPT 88321?

Required documentation includes the outside laboratory's name and location, original case number, date of slide preparation, and preferably a slide transmittal form or chain of custody record. Many payers also expect reference to the original pathology report or diagnosis in the consultation report.