CPT 88304Laboratory

Tissue exam by pathologist

CPT code 88304 covers a basic level tissue examination performed by a pathologist on a surgical specimen. This is the code used when a small, straightforward tissue sample is sent to the lab for microscopic evaluation to check for abnormalities.

Showing rates for

National Average

Base Medicare rate

$41.40

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

0.22

PE RVU (NF)

1.04

MP RVU

0.02

Total RVU

1.28

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

NCCI bundling edits

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Billing tips

Bill each separately submitted and labeled specimen as a distinct unit of 88304 - if three skin tags are submitted in three separate containers with individual labels, bill 88304 x 3
Impact: Increases reimbursement from $41.40 to $124.20 for properly separated specimens; improper bundling costs $82.80
Verify specimen meets Level III criteria before coding 88304 - specimens like prostate needle biopsies (88305) or simple fluids (88172) require different codes
Impact: Prevents 15-30% downcoding denials; 88305 pays $76.42 vs 88304 at $41.40, proper upcoding when appropriate gains $35.02 per specimen
Document medical necessity for pathology examination on specimens that may be considered routine or screening (e.g., incidental appendix, hernia sac)
Impact: Reduces medical necessity denials by 40-60%; prevents $41.40 write-offs per specimen
Use specific specimen source identification in billing records matching pathology report - exact anatomic site and laterality when applicable
Impact: Decreases audit vulnerability and facilitates multiple unit billing; prevents bundling that costs $41.40 per additional specimen
Coordinate with surgical team to ensure specimens requiring Level III vs Level IV or V examination are properly triaged - consult pathology specimen listing in CPT
Impact: Ensures correct code assignment; prevents $35-$150 reimbursement loss from improper level assignment
Submit claims within 90 days of service date and verify LCD/NCD coverage for specimen type in your MAC jurisdiction
Prevents timely filing denials and coverage denials; preserves 100% of $41.40 payment per specimen

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 88304 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 88304 is $41.40 for both facility and non-facility settings. This rate is based on 1.28 total RVUs (0.22 work RVU, 1.04 practice expense RVU, 0.02 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic location based on GPCI adjustments.

How many times can you bill CPT 88304 on the same day?

You can bill CPT 88304 multiple times on the same day based on the number of separately submitted and individually labeled specimens that meet Level III criteria. Each distinct specimen in a separate container with unique identification should be billed as one unit. Use modifier 59 or XS to indicate distinct specimens and prevent bundling denials. Documentation must support separate specimen submission.

What is the difference between CPT 88304 and 88305?

CPT 88304 is Level III surgical pathology for less complex specimens like skin tags, vas deferens, or hernia sacs ($41.40 Medicare rate), while 88305 is Level IV for more complex specimens like prostate biopsies, breast biopsies, or colon polyps ($76.42 Medicare rate). The distinction is based on specimen type as specifically listed in CPT code descriptors, not the pathologist's time or complexity of interpretation. Refer to the CPT manual's specimen listing under each code.

Does CPT 88304 require a modifier when billed with an E/M service?

No, CPT 88304 typically does not require modifier 25 when billed with an E/M service because it is a laboratory/pathology code, not a procedure code. The pathology service is performed by a pathologist separate from the clinical encounter. However, if billing the surgical removal procedure (by surgeon) with an E/M on the same day, the E/M would need modifier 25. The 88304 pathology interpretation stands alone.

What specimens are included under CPT code 88304?

CPT 88304 includes specific Level III specimens: appendix (incidental), fallopian tube (sterilization), fingers/toes (amputation-traumatic), foreskin (other than newborn), hernia sac (any age), nerve, skin tags, sympathetic ganglion, testis (orchiopexy), vaginal mucosa (simple repair), and vas deferens (sterilization). Each specimen type is explicitly listed in the CPT manual. Using 88304 for unlisted specimens or those designated for other levels will result in denials.

Can you bill 88304 for multiple skin tags removed in one procedure?

Yes, but billing depends on specimen submission. If all skin tags are placed in one container, bill 88304 x 1. If each skin tag is placed in a separately labeled container as distinct specimens, bill 88304 for each container (e.g., three containers = 88304 x 3 with modifier 59 or XS). The key is individual specimen identification and separate pathological examination of each. Documentation must support the separate submission and medical necessity.

Is prior authorization required for CPT 88304?

Prior authorization requirements for CPT 88304 vary by payer and are generally not required by Medicare for standard Level III specimens. However, some Medicare Advantage plans and commercial payers may require authorization for pathology services. Always verify with the specific payer before service. Medical necessity documentation should always be obtained from the ordering physician regardless of authorization requirements to prevent denials.