Summary & Overview
CPT 0835T: Digital Whole-Slide Image Digitization for Cytopathology
CPT code 0835T is an add-on code for clinical staff work to scan and digitize whole–slide images from glass microscope slides for immediate or later pathologic diagnosis. It is reported once per unit of cytopathology code 88172, which covers immediate evaluation of fine needle aspiration (FNA) specimen adequacy. The code formalizes reporting for digital slide capture tied to rapid on-site cytopathology workflows, reflecting the increasing use of digital pathology in diagnostic practice.
Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical and billing context for 0835T, common modifiers associated with the code, typical sites of service, and which payers are relevant for coverage and claims processing. The publication outlines national relevance of the code as digital pathology adoption grows, and summarizes the practical reporting relationship between 0835T and 88172 for FNA adequacy evaluations.
This document provides benchmarks and policy-oriented details where available, clarifies billing constructs (add-on status and unit reporting), and supplies guidance on what information is not available in the input. Data not available in the input includes payer-specific reimbursement rates, associated taxonomies, linked ICD-10 diagnoses, and related codes.
Billing Code Overview
CPT code 0835T describes clinical staff work performed to scan and digitize whole–slide images from glass microscope slides for immediate or later pathologic diagnosis. This add-on code is reported one time for digitizing slides associated with one unit of cytopathology code 88172, which is used for immediate evaluation of a fine needle aspiration specimen for adequacy.
Service Type: Digital pathology image acquisition and processing performed by clinical staff.
Typical Site of Service: Hospital pathology labs, independent pathology laboratories, and clinics with cytopathology services where rapid on-site evaluation of fine needle aspiration specimens occurs.
Clinical & Coding Specifications
Clinical Context
A cytopathology technologist digitizes glass slides created from a fine needle aspiration (FNA) performed in an outpatient clinic for immediate adequacy assessment. A patient presents with a palpable thyroid nodule; the proceduralist performs an ultrasound‑guided FNA and prepares air‑dried and alcohol‑fixed slides. A pathology assistant or clinical laboratory staff scans the selected slides using a whole‑slide scanner to create digital images for rapid review by the on‑call pathologist. The pathologist reviews the digital whole‑slide images to determine specimen adequacy and communicates results to the proceduralist to guide whether additional passes are needed. Digitization documented with 0835T is billed as an add‑on (one unit per cytopathology immediate evaluation 88172) and typically occurs in hospital outpatient laboratories, ambulatory surgery centers with on‑site pathology services, or large outpatient pathology/imaging centers that perform immediate adequacy assessments.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the digitization required substantially greater work or complexity than typical (document rationale and time). |
52 | Reduced services | Use when scanning/digitization was partially performed or limited compared to standard service. |
53 | Discontinued procedure | Use when the scanning process was started but discontinued for patient or technical reasons. |
26 | Professional component | Use when reporting only the professional interpretation component separate from technical scanning (if applicable in combined billing scenarios). |
TC | Technical component | Use when reporting only the technical scanning/digitization component (facility billing). |
59 | Distinct procedural service | Use when digitization is a distinct service separate from other billed pathology services on the same date. |
QW | CLIA waived laboratory test | Use if specific waived tests are involved in the immediate onsite evaluation per payer requirements (payer-specific acceptance required). |
90 | Reference laboratory | Use when the scanning/digitization service was performed by a reference laboratory distinct from the ordering provider. |
91 | Repeat clinical diagnostic laboratory test | Use if repeat digitization was clinically indicated and performed to confirm adequacy or quality within a short interval. |
XE | Separate encounter, distinct from 59 | Use when the digitization occurred in a separate encounter and must be distinguished from other services. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207L00000X | Pathology | Pathologists who interpret cytology and adequacy evaluations. |
| 207LP0200X | Anatomic Pathology | Physicians specializing in anatomic/cytopathology workflows. |
| 390200000X | Clinical Laboratory | Clinical laboratory personnel and directors overseeing slide scanning operations. |
| 313E00000X | Cytopathology Technician | Laboratory staff performing slide preparation and whole‑slide scanning. |
| 208000000X | Diagnostic Radiology | Proceduralists (radiologists) performing image‑guided FNA in some settings. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
R22.1 | Localized swelling, mass and lump, neck | Common presenting problem (e.g., thyroid or cervical lymph node) prompting FNA and immediate adequacy assessment with slide digitization. |
E04.1 | Nontoxic single thyroid nodule | A frequent clinical indication for thyroid FNA; digitized slides facilitate immediate adequacy review. |
C73 | Malignant neoplasm of thyroid gland | Suspicious nodules undergoing FNA for diagnosis; digitization supports rapid cytologic assessment. |
R22.2 | Localized swelling, mass and lump, trunk | Masses in other locations that may be sampled by FNA with on‑site adequacy evaluation. |
C77.0 | Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck | Regional lymphadenopathy sampled by FNA where immediate adequacy and digitization guide diagnostic yield. |
D34 | Benign neoplasm of thyroid gland | Benign‑appearing thyroid nodules undergoing FNA for characterization; digitization used for adequacy checks. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
88172 | Cytopathology, immediate cytologic evaluation for adequacy (e.g., FNA), by a physician, or other qualified health care professional, who is onsite | 0835T is reported as an add‑on unit per each 88172 adequacy evaluation when clinical staff digitize the slide for review. |
88331 | Pathology consultation during surgery (e.g., frozen section) with microscopic examination, single specimen | Often performed in parallel when intraoperative tissue evaluation is needed; digitization may support remote review. |
88305 | Surgical pathology, gross and microscopic examination, without special stains | Routine surgical pathology that may follow an FNA diagnosis; digitized cytology slides can inform surgical planning. |
88321 | Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain | Ancillary testing that may be ordered after cytologic assessment; digitized images may be used for triage. |
88174 | Cytopathology, immediate cytologic evaluation with interpretation of prepared cytologic smears, when performed, multiple specimens | Related immediate cytology procedures where digitization may be applied similarly. |