Summary & Overview
CPT 0844T: Digital Pathology Slide Scanning and Digitization
CPT code 0844T identifies clinical staff work to scan and digitize whole–slide images from glass microscope slides to support immediate or later pathologic diagnosis. It is an add–on code intended to be reported once for digitizing slides associated with one unit of intraoperative consultation code +88334, documenting digitization for an additional tissue site during intraoperative consults. Nationally, this code captures the growing use of digital pathology workflows that enable remote review, rapid intraoperative diagnosis, and integration with digital archives.
Key payers in the national context include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an explanation of clinical and billing context for digital slide scanning, typical sites of service, and how this add–on code is used in conjunction with intraoperative consultation services. The publication outlines benchmarking considerations and policy-relevant points for payers and providers, and highlights where input data is not available.
Data not available in the input: detailed payer-specific coverage rules, associated taxonomies, ICD-10 diagnoses, and related service-line details.
Billing Code Overview
CPT code 0844T describes clinical staff work to scan and digitize whole–slide images from glass microscope slides for immediate or later pathologic diagnosis. This add–on code is reported to indicate digitization of slides associated with intraoperative pathology consultation on touch–preparation slides from an additional tissue site.
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Service type: Digital pathology slide scanning and digitization performed by clinical staff
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Typical site of service: Pathology laboratory or hospital intraoperative pathology suite
Clinical & Coding Specifications
Clinical Context
A surgical oncology patient undergoing resection of a suspected malignancy has multiple tissue specimens submitted for intraoperative evaluation. The pathology laboratory receives touch-preparation slides from an additional tissue site for immediate consultation. Clinical staff scan and digitize the glass slides to create whole-slide images for rapid review by the pathologist, enabling real-time intraoperative diagnosis and documentation for the surgeon. The typical workflow: specimen accessioning → touch-prep slide preparation by histology staff → slide scanning/digitization using whole-slide scanner (clinical staff work) reported with add-on code +0844T → pathologist reviews digital images and reports intraoperative consultation documented with consultation code +88334 for the additional site. Typical site of service is the hospital operating room and the hospital pathology laboratory supporting intraoperative frozen section/consultation services. Common clinical scenario diagnoses include suspected malignancy, margin assessment, or unexpected tumor at an additional site during the procedure.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the scanning/digitizing required substantially greater work, such as complex slide preparation, multiple focal areas requiring high-resolution scans, or significant additional time beyond typical expectations. |
52 | Reduced services | Use when scanning was attempted but reduced in scope, such as fewer slides scanned than planned due to limited tissue or cancellation of part of the study. |
53 | Discontinued procedure | Use when scanning/digitizing was started but discontinued due to technical failure or specimen unavailability and the procedure cannot be completed. |
26 | Professional component | Use when billing only the professional interpretation of the digitized images separate from technical scanning (if applicable under local billing rules). |
TC | Technical component | Use when billing only the technical scanning service separate from the pathologist interpretation (if applicable under local billing rules). |
59 | Distinct procedural service | Use when digitization for an additional intraoperative consultation is separate from other services on the same day and must be reported as distinct. |
76 | Repeat procedure by same physician | Use when additional digitization is performed more than once for the same patient by the same provider during the same operative session. |
77 | Repeat procedure by another physician | Use when another provider performs repeat digitization during the same operative session. |
QW | CLIA waived test (if applicable) | Use when the scanning/digitizing device or procedure is billed under rules that designate the test as CLIA-waived (rare for whole-slide imaging; include only when applicable). |
AS | Physician service in ambulatory surgical center | Use when the scanning/digitizing is performed as part of services provided within an ambulatory surgical center billing context. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 2085P0200X | Pathology & Clinical Laboratory | Pathologists who interpret intraoperative digital slides. |
| 213E00000X | Histopathology Technician | Clinical laboratory/histology staff who prepare and scan slides (histotechnologist/ histology technician). |
| 261QM0800X | Digital Health/Health Informatics | Professionals responsible for digital pathology operations and image management. |
| 207L00000X | Anatomic Pathology | Pathologists providing intraoperative consultation services. |
| 363A00000X | Hospitalist/Clinical Laboratory Administration | Lab managers overseeing scanning workflow and compliance. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
C50.919 | Malignant neoplasm of unspecified site of unspecified female breast | Breast cancer specimens may require intraoperative consultation and digitization of touch-prep slides for margin assessment. |
C18.9 | Malignant neoplasm of colon, unspecified | Colon tumor resections may prompt intraoperative consultation for margin or additional site assessment with slide digitization. |
C61 | Malignant neoplasm of prostate | Prostate specimens with unexpected secondary lesions may trigger additional site touch-prep consultation and scanning. |
C34.90 | Malignant neoplasm of unspecified part of unspecified bronchus or lung | Pulmonary nodules sampled intraoperatively may require immediate pathologic consultation and slide digitization. |
D49.7 | Neoplasm of unspecified behavior of other and unspecified sites | Indeterminate neoplasms encountered intraoperatively may prompt additional-site touch preps and digitization. |
R91.8 | Other nonspecific abnormal findings of lung field | Intraoperative findings leading to immediate cytologic touch preps can be digitized for rapid review. |
R10.2 | Pelvic and perineal pain | Acute intraoperative findings prompting additional-site sampling and immediate slide digitization for diagnosis. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
+88334 | Intraoperative pathology consultation on touch preparation from an additional tissue site; immediate microscopic examination | Primary consultation code to which add-on code +0844T is reported (one unit of +0844T per unit of +88334). |
88331 | Surgical pathology, gross and microscopic; first tissue block | Often billed when permanent section processing and final surgical pathology follow intraoperative consultation. |
88332 | Surgical pathology, gross and microscopic; each additional block (List separately in addition to code for primary block) | Used when multiple tissue blocks are submitted for permanent section after intraoperative consultation. |
88342 | Immunohistochemistry, per specimen; initial single antibody stain | May be performed subsequently to further characterize a lesion identified during intraoperative consultation. |
88329 | Pathology consultation during surgery, consultation on a single frozen section | Related intraoperative frozen section consultation that may accompany or precede digital slide scanning workflows. |