Pathology billing services
Pathology claims are counted per specimen, split between professional and technical components and sent without a patient visit. We handle each detail.
Why pathology billing takes specialty knowledge
Pathology billing is unusual because the practice rarely sees the patient. Demographics and insurance come from the referring office or hospital, and missing or wrong information is the single largest cause of pathology denials. On top of that, surgical pathology is billed per specimen, stains are billed per antibody or procedure, and the professional and technical components may belong to different entities.
SFA Solutions builds a front-end process that catches missing insurance data before claims are filed, and our coders assign 88300 to 88309 levels per specimen with the correct stain and IHC codes. We apply Medicare's date of service rules for specimens from hospital patients, track CLIA requirements and work inside your laboratory or PM system. Claims are checked against payer edits before submission.
Common codes we work with in pathology
| Code | Description |
|---|---|
| 88305 | Level IV surgical pathology, gross and microscopic exam |
| 88307 | Level V surgical pathology, gross and microscopic exam |
| 88342 | Immunohistochemistry or immunocytochemistry, per specimen, initial single antibody stain |
| 88341 | Immunohistochemistry, per specimen, each additional single antibody stain |
| 88312 | Special stain, Group I, for microorganisms |
| 88112 | Cytopathology, selective cellular enhancement technique with interpretation |
| 88175 | Cytopathology, cervical or vaginal, liquid-based, automated screening with manual rescreening |
| G0416 | Surgical pathology, prostate needle biopsy sampling, any number of specimens (Medicare) |
CPT is a registered trademark of the American Medical Association. Payer rules vary; we check each payer's current policy.
Where pathology practices lose revenue
Per-specimen coding
Each separately identified specimen gets its own surgical pathology code at the level that fits the tissue and diagnosis, from 88302 to 88309. Three colon polyps submitted in separate containers are three units of 88305. Coding by container count without reading the report causes both overbilling and underbilling.
Stains and immunohistochemistry
IHC is billed with 88342 for the first antibody per specimen and 88341 for each additional antibody on the same specimen. Special stains use 88312 or 88313. MUE limits and medical necessity rules apply, so the report has to show why each stain was needed.
Professional and technical components
Modifier 26 reports the pathologist's interpretation and modifier TC reports the slide preparation. When a pathology group reads slides prepared in a hospital, only the professional component goes on the group's claim. For Medicare prostate needle biopsies, G0416 replaces 88305 regardless of the number of specimens.
Missing demographics and the date of service rule
Claims built from requisition data often lack a subscriber ID or have the wrong payer. Medicare's date of service and 14-day rules also decide whether a test on a hospital specimen is billed by the lab or bundled into the hospital's claim. Both need checks before submission.
What else affects pathology revenue
A/R challenges in pathology
Pathology A/R is often slowed by claims missing patient or insurance data, because the lab rarely sees the patient. Small-dollar denials pile up into large balances when they are not worked in batches by denial reason. Patient statements also cause confusion, since many patients do not know a pathologist was involved, and No Surprises Act protections limit balance billing when an out-of-network pathologist reads a specimen from an in-network facility.
Credentialing considerations
Pathologists usually need enrollment with every payer that covers the hospitals and surgery centers they serve, even though they do not choose the patient. An independent lab needs its own CLIA certificate, Medicare enrollment as an independent clinical laboratory, and contracts with commercial plans, some of which use limited lab networks. Adding a new pathologist means updating each facility agreement and payer roster before their reads are billed.
Payer considerations
Medicare pays the professional component of anatomic pathology under the physician fee schedule and clinical lab tests under the Clinical Laboratory Fee Schedule. Some commercial plans use lab benefit managers, such as Avalon, for test policies and prior authorization of molecular and genetic testing. In MolDX regions, Medicare MACs require molecular tests to be registered before they are paid.
Pathology coding details that affect payment
ICD-10 considerations
Pathology claims are coded from the final diagnosis on the signed report, not the clinical impression on the requisition. When the report is benign or normal, the reason for the test from the requisition, such as a sign or symptom, becomes the diagnosis. Terms like suspicious for or consistent with on an outpatient report are not coded as confirmed disease, so the code reflects the highest level of certainty. Colon polyps illustrate why this matters: a tubular adenoma is coded in D12 by segment while a hyperplastic polyp uses K63.5. Screening Pap tests use Z12.4 or the routine gynecological exam codes, and skin specimens use C44 codes by type and site.
Modifiers to watch
| 26 | Used on the pathologist's interpretation when the slides were prepared by a hospital or another lab that bills the technical component. |
|---|---|
| TC | Billed by the lab that prepares the slides when a different pathologist provides the interpretation. |
| 90 | Applied when the billing lab sends the test to a reference lab and bills for it under the payer's rules for referred tests. |
| 91 | Used when the same clinical lab test is repeated on the same day to obtain a later result, not to confirm an earlier one. |
| XS or 59 | Added to stain codes when special stains or IHC are performed on separate specimens and an edit would otherwise bundle them. |
Global periods
Global surgical periods generally do not apply to pathology, since nearly all services are diagnostic. Bone marrow biopsy and aspiration codes performed by pathologists carry 0-day globals, and in pathology the word global usually means billing both the professional and technical components.
Medicare considerations
Medicare's national coverage determinations for common lab tests, in the NCD 190 series such as NCD 190.23 for lipid testing, list the ICD-10 codes that support each test, and tests ordered with other diagnoses need an ABN to bill the patient. Clinical lab tests are paid under the Clinical Laboratory Fee Schedule, which CMS bases on private payer data reported by labs. The ordering provider's NPI must be on the claim and enrolled in Medicare for the lab to be paid.
Pathology billing KPIs to track
- Missing demographics rate at intake. Pathology rarely sees the patient, so incomplete requisition data is the largest controllable cause of denials.
- Denials grouped by reason. Small-dollar denials are only worth working in batches, so grouping by reason shows which fixes recover the most.
- Payment per specimen by payer. Comparing average payment per 88305 across payers highlights underpaying contracts and limited lab networks.
- Days from sign-out to claim. Claims cannot be built until the report is signed and demographics are complete, so this lag drives A/R.
Pathology billing audit checklist
- Confirm surgical pathology units match the number of separately identified specimens on the report.
- Check that 88342 and 88341 are billed per specimen and supported by the report.
- Verify 26 or TC is applied based on who prepared the slides.
- Review Medicare prostate biopsies for G0416 in place of 88305.
- Confirm the date of service and billing entity follow Medicare's 14-day rule for hospital specimens.
- Check that the ordering provider's NPI is present and enrolled on every Medicare claim.
Related: Pathology coding · denial management · RCM · billing audit · Pathology billing in Texas · Epic billing · athenahealth billing · RCM resources
How SFA runs pathology billing
We review your requisition intake and claim history to find the most common causes of missing data and denials.
We set up demographic checks and eligibility lookups so claims carry correct payer information before coding begins.
Coders assign specimen levels, stains and component modifiers from the final report with a 24-hour target for submitting clean claims after final review.
We work rejections, denials and patient balances and report payer trends to your lab manager each month.
The services that matter most for pathology
Medical Billing
Clean demographic capture and timely filing matter more in pathology because there is no patient visit to fix errors.
Learn moreMedical Coding
Per-specimen levels, IHC counts and component modifiers drive almost all pathology revenue.
Learn moreA/R Recovery
Pathology A/R often holds many small unpaid claims that add up and need steady follow-up.
Learn moreWhat practices typically see with SFA
Averages and selected client results. Your free audit shows where your own numbers stand today.
Target for the claims we manage, not a measured average.
Highest improvement seen in selected client results.
Largest drop in A/R days seen in selected client results.
Targeted for submission within 24 hours after final review.
From primary care and nurse practitioners to surgery and imaging.
We work inside the system your practice already uses.
Results vary by practice, specialty, payer mix, claim volume, billing history, documentation and other factors. Performance figures represent average or selected client results and are not guarantees of future performance. The 95% figure is a clean-claim target, not a measured cohort. The client-results page does not include a measurement period, starting collections, or practice size.
Pathology billing questions
How are multiple specimens billed?
Each separately submitted and separately examined specimen is billed with its own unit of the matching surgical pathology code. If two biopsies are placed in one container and not separately identified, they count as one specimen.
When do we bill 88341?
88341 is used for each additional single antibody IHC stain on the same specimen after the first, which is billed with 88342. A new specimen starts again with 88342.
What is the Medicare 14-day rule?
For specimens collected during a hospital stay or outpatient encounter, the date of service and who bills depend on when the test is ordered relative to discharge. Tests ordered 14 or more days after discharge that meet the rule's conditions can be billed by the lab directly to Medicare.
Do you bill clinical lab tests too?
Yes. We bill clinical lab panels, molecular tests and other lab services, including CLIA number and QW modifier requirements where they apply.
Can you get demographic information from referring offices?
Yes. We follow up with referring practices and hospitals for missing insurance details so claims can be filed within payer deadlines.
Related specialties
See what your pathology billing is missing
Send us a few details and an RCM specialist who knows pathology will review where claims are denied, underpaid or left unbilled.
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- Reply typically within one business day
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