CPT Code 88305: Surgical Pathology, Level IV, Gross & Microscopic Examination

CPT code 88305 reports a Level IV surgical pathology service involving both gross and microscopic examination of a specimen. 

It falls under the pathology and laboratory category and describes the pathologist’s examination and diagnostic interpretation — not the procedure that removed the tissue. The biopsy or excision is coded separately by the clinician who performed the removal.

The most important compliance fact about 88305 is that the unit of service is the specimen, not the slide, block, or tissue fragment. Processing a single gastric biopsy specimen into multiple cassettes and slides does not generate multiple units. 

Conversely, three separately identified skin biopsy specimens submitted from different sites may support three units. 

The second critical exception is Medicare’s prostate needle biopsy rule — CMS requires one unit of G0416 for all submitted prostate needle biopsy specimens from a single patient, regardless of the number of cores or containers.

What does CPT code 88305 cover?

Here is what CPT code 88305 covers:

Detail	CPT 88305
Description	Level IV surgical pathology — gross and microscopic examination
Category	Pathology and Laboratory
Service	Pathologist’s examination and report (not the biopsy procedure)
Unit of service	Per specimen
Components	Professional (26), Technical (TC), or Global
Medicare prostate exception	Use G0416 instead of 88305 for prostate needle biopsy specimens
Commonly compared with	CPT 88304 (Level III)

The College of American Pathologists identifies a gastric biopsy as an example of an 88305 specimen. 

Code selection in the surgical pathology family is based on specimen source and type as listed in the current CPT codebook — not the final diagnosis or the pathologist’s time. 

A benign biopsy and a malignant biopsy from the same source may both fall under 88305.

When should you use CPT 88305?

88305 applies when the pathologist performs a Level IV gross and microscopic examination of an appropriately classified specimen.

Use CPT 88305 when

• The specimen type matches the CPT Level IV specimen list (consult the current AMA CPT codebook)
• Both gross and microscopic examination are performed
• The service is the pathology examination — not the biopsy procedure

When not to use it

• The specimen matches a different surgical pathology level (88304 for Level III, 88307 for Level V, 88309 for Level VI)
• The service is gross examination only — use 88300
• The specimen is prostate needle biopsy for a Medicare patient — use G0416
• The service is the tissue-removal procedure — that is coded separately by the surgeon

How is CPT 88305 selected?

Selection depends on the specimen type (matching the CPT Level IV list), the examination performed (gross plus microscopic), and the applicable payer rules for units.

Units — specimens, not slides

One separately identifiable specimen requiring individual examination equals one unit. Multiple blocks and slides from a single specimen do not generate additional units. 

Multiple separately identified specimens from different sites may support multiple units — with documentation identifying each specimen and its diagnosis.

Component billing

Modifier	Component
88305-26	Professional interpretation and report
88305-TC	Technical laboratory work
88305 (no modifier)	Global — both components

What documentation supports CPT 88305?

The pathology report should include specimen identification, source, and type, gross description, microscopic findings, final diagnosis for each specimen, the pathologist’s authenticated signature, and clear identification when multiple specimens are submitted.

How much does CPT 88305 reimburse?

Payment varies by component, locality, and payer. There is no single universal rate. Use the CMS PFS lookup tool with the correct year, locality, and component (global, 26, or TC) for a Medicare-specific rate.

Which modifiers apply to CPT 88305?

Here are the modifiers that apply to 88305 CPT code:

Modifier	When it applies
26	Professional component only
TC	Technical component only
59	Only when genuinely distinct services and the edit permits — not to bypass MUE limits

Do not bill 88300 separately with 88305 for the same specimen — gross examination is included in 88305.

CPT 88305 vs. 88304 — which one fits?

The distinction is the specimen classification level.

Feature	CPT 88305	CPT 88304
Level	IV	III
Examination	Gross + Microscopic	Gross + Microscopic
Example specimen	Gastric biopsy	Nonneoplastic appendix

Choose 88305 when the specimen matches the CPT Level IV specimen list. Choose 88304 when the specimen matches the Level III list.

The specimen source and type — not the final diagnosis — drive the level assignment.

What billing errors should you avoid with CPT 88305?

Here are the common billing errors associated with this CPT code:

1. Billing units per slide or block instead of per specimen 

The unit of service is the specimen. Multiple preparation materials from one specimen do not generate additional units.

2. Billing 88305 for Medicare prostate needle biopsies 

CMS directs one unit of G0416 for all prostate needle biopsy specimens from the patient. Using 88305 per core for Medicare is incorrect.

3. Billing 88300 alongside 88305 for the same specimen 

Gross examination is included in 88305. Separately billing 88300 duplicates the gross component.

4. Billing global when only interpretation was provided 

If the pathologist furnished only the professional component, use 88305-26. Global billing includes the technical component, which the pathologist may not have furnished.

5. Using modifier 59 to bypass MUE limits 

CMS warns against using modifiers to circumvent medically unlikely edits for an unusually high number of units.

Frequently asked questions about CPT 88305

Here are some commonly asked questions about 88305 CPT code: