Pathology Revenue Infrastructure
Medbilling RCM provides specialized pathology billing services covering surgical pathology CPT codes (88300–88309), cytopathology (88104–88160), immunohistochemistry (88342–88344), molecular pathology (81161–81408), technical and professional component split billing (modifier 26/TC), and FISH testing — ensuring accurate claims and maximum reimbursements for pathology practices and hospital labs.
Surgical Pathology Levels
Surgical pathology CPT codes 88300–88309 are selected by examination complexity, not specimen type. Our pathology-certified coders review every pathologist's report to confirm the correct level — preventing systematic downcoding and compliance-risk upcoding.
Simple tissue specimens, gross only
Hernia sac, vessels, foreign body
Cholecystitis, appendix, fallopian tube
Biopsies, polyps, skin excisions, cervix
Prostate, bladder, uterus with neoplasm
Total/radical resection for neoplasm
Pathologist interprets — billed by independent pathologist when technical performed by hospital/lab
Lab processing — billed by hospital/independent lab when interpretation billed separately by pathologist
Both technical and professional performed by same entity — billed as complete service
Pathology Billing Challenges
Pathology billing spans gross examination coding, IHC antibody counting, molecular pathology tiers, FISH probe documentation, and TC/26 split billing — each requiring specific documentation to support the billed code.
Level selection is based on examination complexity, not specimen type. The pathologist's report must support the complexity level billed. 88305 is the most commonly billed code — but 88307 requires documentation of additional complexity. We review every pathology report before code selection to ensure level accuracy.
IHC is billed using CPT 88342 for the first antibody and 88344 for each additional antibody per specimen. The number billed must match the number of antibodies used per the pathology report. Overbilling antibody counts is a top IHC audit trigger. We verify antibody count against staining documentation on every IHC claim.
Molecular pathology codes are tiered by test complexity. Code selection is gene-specific and methodology-specific — billing the wrong tier is a common and costly error. Many molecular tests require prior authorization. We maintain current molecular code mappings and manage prior auth for high-cost molecular tests.
FISH is billed using CPT 88365 (single probe) and 88366 (each additional probe). Documentation must identify each specific probe used. FISH is commonly required for oncology diagnosis and chromosomal analysis. We verify probe count, document all probes used, and manage prior authorization for FISH tests.
When the pathologist is independent from the processing lab, modifier 26 applies to the professional interpretation and TC to the technical processing. Billing the global code when split billing applies — or vice versa — generates denials and compliance risk. We determine the correct billing structure based on employment and facility relationship.
Cytopathology coding covers Pap smears, fine needle aspirations, and fluid cytology. Each specimen type and interpretation method has a distinct CPT code. Cytopathology claims also require correct specimen source documentation and ICD-10 linking. We apply the correct cytopathology code based on specimen type and examination method.
Revenue Control Framework
End-to-end pathology billing infrastructure from specimen receipt coding through molecular pathology authorization and TC/26 split billing reconciliation.
Review examination complexity in pathologist report — select 88300–88309 level based on documented examination type, not specimen only
Verify employment relationship and facility arrangement to determine correct modifier 26, TC, or global code on every claim
Match 88342 and 88344 billing to staining documentation — antibody count reconciled against lab records before claim submission
Tier code selection for 81161–81408 and probe count for 88365/88366 — with prior authorization managed for high-cost molecular tests
88104–88160 code selection based on specimen type and examination method — ICD-10 linked to correct source documentation
Root-cause pathology denial analysis, IHC count appeals, and audit defense for level selection and molecular tier compliance
Operational Transformation
Why Medbilling RCM
Our pathology billing team understands surgical pathology level selection, IHC antibody counting, molecular pathology tier coding, FISH probe documentation, and TC/26 split billing — the specific expertise that determines correct payment for every pathology encounter.
Complexity-based 88300–88309 selection from pathologist report review — not specimen defaults that systematically undercode or overcode.
88342 first antibody + 88344 each additional — antibody count reconciled against staining records on every IHC claim.
Gene-specific and methodology-specific code selection for 81161–81408 with prior auth management for high-cost molecular tests.
88365/88366 probe count matched to lab documentation — prior authorization managed for oncology FISH testing.
Employment relationship and facility arrangement determines modifier 26, TC, or global — correctly applied on every pathology claim.
Every specialist holds AAPC certification with dedicated pathology training across surgical, cytopathology, and molecular coding.
88104–88160 code selection based on specimen source and examination method — Pap smear, FNA, and fluid cytology correctly coded.
Specimen-level revenue tracking, level code distribution analysis, IHC billing performance, and molecular prior auth reporting.
Common Questions
Direct answers about surgical pathology levels, TC/26 billing, IHC coding, molecular pathology, and FISH testing. View all specialties we serve.
Surgical pathology CPT codes 88300–88309 are selected based on the complexity of the pathologist's examination, not the specimen type. CPT 88300 covers gross examination only; 88305 covers most routine tissue examinations; 88307 is for more complex specimens; and 88309 is for the most complex cases. We review the pathologist's report to confirm examination complexity and select the appropriate level code, preventing downcoding from 88305 to 88300 and upcoding from 88305 to 88307 without supporting documentation.
When pathology services are split between a hospital or independent lab (technical component, modifier TC) and an independent pathologist (professional component, modifier 26), both must be billed separately. The pathologist bills with modifier 26 for the professional interpretation; the facility bills with modifier TC for the technical processing. When both are performed by the same entity, the global code (no modifier) is billed. We determine the correct billing structure based on employment arrangement and facility relationship before every claim.
Immunohistochemistry is billed using CPT 88342 for the first antibody and 88344 for each additional antibody per specimen. Each antibody used must be documented separately. We verify that the number of antibodies billed matches the pathology report, ensure IHC codes are linked to supporting diagnoses, and prevent overbilling by confirming antibody count against staining records on every IHC claim.
Molecular pathology CPT codes (81161–81408) are tiered by technical complexity of the test methodology. Code selection is determined by the gene analyzed and the type of molecular analysis performed. Many molecular tests require prior authorization with specific diagnosis codes. We maintain current molecular pathology code updates, verify prior auth requirements by payer, and ensure correct genetic marker codes are used on every molecular pathology claim.
Fluorescence in situ hybridization (FISH) testing uses CPT 88365 (single probe) and 88366 (each additional probe). FISH is commonly used for cancer diagnosis and chromosomal analysis. Documentation must identify the specific probe(s) used, the specimen analyzed, and the clinical indication. Prior authorization is frequently required for FISH testing, particularly in oncology contexts. We verify probe count, document all probes used, and manage prior authorization for FISH tests on every applicable claim.
Revenue Assessment
Schedule a free pathology billing assessment and discover how accurate level code selection, IHC antibody count accuracy, and TC/26 split billing can significantly improve your practice collections.
