Pathology BillingComplete Coding & Revenue Guide (2026)Top CPT codes with current RVU data, denial patterns, modifier rules, bundling pitfalls, and revenue opportunities for pathology practices.
Top CPT Codes
The highest-value pathology CPT codes with current RVU data and Medicare payment from the CY 2026 Physician Fee Schedule. Click any code for the full payment, bundling, and modifier guide.
Most practices under-capture revenue on these codes through downcoding, missed modifier 25, stale fee schedules, or misapplied bundling. Our coders audit every line against the documentation before submission so the revenue earned actually gets billed.
Bundling Pitfalls
5 trapsThe code pairs that trigger NCCI edits and CO-97 denials in pathology. Know these before billing.
88305: 88307: Surgical pathology levels: 88302 (gross only), 88304 (level III), 88305 (level IV), 88307 (level V), 88309 (level VI). Each specimen gets ONE level code. Cannot bill 88305 + 88307 for the same specimen — choose the level matching the specimen type per CPT.
88312: 88313: Special stains: 88312 (Group I — histochemistry per stain) vs 88313 (Group II — enzyme histochemistry). Cannot bill 88312 for enzyme stains or 88313 for routine histochemistry. Each stain is 1 unit.
88342: 88341: IHC: 88342 first stain + 88341 each additional stain on same block. Do NOT bill 88342 x5 for 5 IHC stains — bill 88342 + 88341 x4.
88331: 88332: Intraoperative frozen section: 88331 first tissue block + 88332 each additional block. Cannot bill 88331 twice for 2 blocks — use 88331 + 88332.
88360: 88361: Morphometric analysis: 88360 first (manual), 88361 first (computer-assisted with physician interpretation). These are mutually exclusive per specimen — use one or the other.
CO-97 bundling denials are recoverable with correct modifier documentation. Most billers write them off. We work each one against the clinical record and resubmit with the right modifier 25 or 59 path.
Modifier Guidance
When to apply each modifier in pathology claims. Wrong modifier application is the top single-line denial trigger and a leading audit target.
Professional component — pathologists in hospital settings typically bill 26 only. The hospital bills TC for processing, embedding, staining. Independent labs bill global.
Distinct specimen — use when multiple specimens from different anatomic sites are submitted in the same accession. Each specimen gets its own 88305/88307.
Repeat clinical diagnostic lab test — use when the same test is repeated on the same day (rare in pathology, more common in clinical lab).
Technical component — covers specimen processing, slide preparation, staining. Billed by the facility performing the technical work.
CLIA waived test — for point-of-care tests performed under CLIA waiver (not applicable to surgical pathology but applies to clinical pathology tests like rapid strep, UA dipstick).
Revenue Opportunities
6 playsThe billing codes and services most pathology practices under-capture. Each one is a recurring revenue lift, not a one-time fix.
Molecular pathology revenue: NGS panels (81445 = $600-1,200 per solid tumor panel, 81455 = $2,000-4,000 per comprehensive genomic profiling). As precision medicine grows, molecular pathology is the fastest-growing revenue segment.
IHC revenue: Each IHC stain (88342/88341) pays $50-80. Average breast cancer case requires 4-6 IHC stains (ER, PR, HER2, Ki-67) = $200-400 per case. High-volume breast pathology practices generate significant IHC revenue.
Frozen section revenue: 88331 + 88332 pays $100-200 per frozen section session. Hospital pathologists performing 5-10 frozens/day = substantial added value to the service contract.
Second opinion consultations: 88321-88325 pays $80-200 per consultation. Building a referral network for second opinions on difficult cases generates revenue and reputation.
Cytopathology (FNA): On-site adequacy assessment during FNA procedures (88333/88334) pays $80-120 and reduces non-diagnostic rates. Cytopathologists who provide rapid on-site evaluation attract procedural referrals.
Digital pathology: Whole slide imaging enables remote pathology (telepathology), second opinions, and AI-assisted diagnosis. While not separately reimbursed yet, it enables volume efficiency and geographic reach.
Documentation Checklist
What the chart must contain to support billing. Missing documentation means audit vulnerability.
- Surgical pathology (88302-88309): Document specimen type (per CPT descriptor), gross description (size, weight, color, consistency, lesion characteristics), microscopic description (architectural pattern, cellular features, margins, lymphovascular invasion), and final diagnosis with applicable staging (pTNM for malignancies).
- Immunohistochemistry (88342/88341): Document antibody/stain name, clone number, result (positive/negative/equivocal), staining pattern (nuclear, membranous, cytoplasmic), intensity, percentage of cells staining, and clinical significance/interpretation.
- Frozen section (88331/88332): Document clinical question ('Is it malignant?' 'Are margins clear?'), number of tissue blocks frozen, findings per block, and concordance with permanent sections.
- Molecular pathology (81235-81479): Document gene tested, methodology (PCR, FISH, NGS), result, variant classification (pathogenic, VUS, benign per ACMG), and clinical significance for treatment planning.
- Cytopathology (88112-88177): Document specimen type (FNA, Pap, body fluid), adequacy assessment, diagnostic category (Bethesda for cervical, Milan for salivary, etc.), and recommendation.
Coding Workflow
Step by step approach for coding pathology encounters correctly.
1. Assign correct surgical pathology level per specimen type (CPT defines which specimens are level IV vs V vs VI — this is NOT subjective). 2. Count specimens: each separately identified specimen from a different anatomic site gets its own code. 3. For special stains: count each individual stain performed. IHC: 88342 (first) + 88341 (each additional). Histochemistry: 88312 per stain. 4. For frozen sections: 88331 (first block) + 88332 (each additional block). Report blocks, not specimens. 5. For molecular testing: use specific CPT codes when available (81235 EGFR, 81210 BRAF). Use 81479 (unlisted) only when no specific code exists. 6. Professional interpretation (26) vs global billing depends on employment model.
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Everything about Pathology billing
What CPT codes does Pathology bill most often?
Top Pathology codes include 88305 (Tissue exam by pathologist); 88307 (Tissue exam by pathologist); 88309 (Tissue exam by pathologist); 88312 (Special stains group 1); 88313 (Special stains group 2).
What are the most common denials in Pathology billing?
Pathology denials concentrate around medical necessity, bundling, prior authorization, and modifier errors.
Does Go Medical Billing handle Pathology?
Yes. Go Medical Billing handles Pathology billing with AAPC-certified coders, payer-specific scrub rules, and dedicated account management. Starting at 2.49 percent of collections with no setup fees.
Specialty content reviewed by AAPC-certified coders. CPT codes and descriptions are copyright of the AMA. Medicare payment varies by locality. Commercial rates vary by contract.
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We audit your last 90 days of pathology claims and surface revenue leakage in coding, modifier use, and bundling. AAPC-certified coders. 2.49 percent of collections. No setup fees.