Coding Ahead
CasePilot
Medical Coding Assistant
Case2Code
Search and Code Lookup Tool
RedactPHI
HIPAA-Compliant PHI Redaction
DetectICD10CM
ICD-10-CM Code Detection
Log in Register free account
1 code page views remaining. Guest accounts are limited to 1 page view. Register free account to get 5 more views.
Log in Register free account

Official Description

Examination and selection of retrieved archival (ie, previously diagnosed) tissue(s) for molecular analysis (eg, KRAS mutational analysis)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 88363 refers to the examination and selection of previously diagnosed tissue samples for the purpose of conducting molecular analysis. This procedure involves retrieving archival tissues that have already undergone an initial examination and diagnosis. The primary goal of this process is to gather further insights into a neoplasm or other disease processes, which can significantly aid in formulating an effective treatment regimen. Molecular analysis encompasses a variety of tests aimed at investigating chromosomes, chromosome mutations, genes, and gene mutations that play a crucial role in disease states and can influence treatment outcomes. A notable example of this type of analysis is the KRAS mutational analysis, which is particularly relevant for patients diagnosed with specific malignancies. This analysis seeks to identify mutations in the KRAS gene, which are often linked to a poor prognosis or a limited response to therapies that target the epidermal growth factor receptor (EGFR) pathway. The EGFR pathway is a complex network of signals that are integral to the development and growth of cancer, making the insights gained from this molecular analysis vital for tailoring patient-specific treatment strategies.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure associated with CPT® Code 88363 is indicated for various clinical scenarios where additional molecular insights are necessary to inform treatment decisions. The following conditions may warrant this procedure:

  • Neoplasm Evaluation The procedure is performed to obtain further information regarding a neoplasm, particularly when initial diagnostic results suggest the presence of malignancy.
  • Assessment of Disease Progression It is indicated when there is a need to assess the progression of a previously diagnosed disease, allowing for adjustments in treatment plans based on new molecular findings.
  • Targeted Therapy Consideration The procedure is relevant for patients who may benefit from targeted therapies, especially those with malignancies that are known to be influenced by specific genetic mutations.

2. Procedure

The procedure for CPT® Code 88363 involves several critical steps to ensure accurate molecular analysis of the retrieved archival tissue samples. Each step is essential for the integrity and reliability of the results.

  • Step 1: Retrieval of Archival Tissue The first step involves the careful retrieval of previously diagnosed tissue samples from archival storage. These samples must be selected based on their relevance to the current clinical question and the potential for providing valuable molecular insights.
  • Step 2: Examination of Tissue Samples Once the archival tissues are retrieved, they undergo a thorough examination to confirm their suitability for molecular analysis. This examination ensures that the samples are intact and that the initial diagnosis is accurate, which is crucial for the validity of subsequent tests.
  • Step 3: Molecular Analysis After confirming the integrity of the tissue samples, molecular analysis is performed. This may include various tests aimed at identifying specific genetic mutations, such as KRAS mutations, which can provide critical information regarding the patient's prognosis and potential treatment responses.

3. Post-Procedure

Post-procedure care following the molecular analysis associated with CPT® Code 88363 typically involves monitoring the patient for any necessary follow-up based on the results of the analysis. The findings from the molecular tests can significantly influence treatment decisions, and healthcare providers may need to discuss the implications of these results with the patient. Additionally, it is essential to document the outcomes of the molecular analysis thoroughly, as this information will be critical for ongoing patient management and treatment planning.

Short Descr XM ARCHIVE TISSUE MOLEC ANAL
Medium Descr EXAM & SELECT ARCHIVE TISSUE MOLECULAR ANALYSI
Long Descr Examination and selection of retrieved archival (ie, previously diagnosed) tissue(s) for molecular analysis (eg, KRAS mutational analysis)
Status Code Active Code
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 0 - No payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator STV-Packaged Codes
Type of Service (TOS) 5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS) T1G - Lab tests - other (Medicare fee schedule)
MUE 2
CCS Clinical Classification 234 - Pathology

This is a primary code that can be used with these additional add-on codes.

0847T Add On Code Resequenced Code MPFS Status: Carrier Priced APC N Digitization of glass microscope slides for examination and selection of retrieved archival (ie, previously diagnosed) tissue(s) for molecular analysis (eg, KRAS mutational analysis) (List separately in addition to code for primary procedure)
X5 Diagnostic services requested by another clinician: for reporting services by a clinician who furnishes care to the patient only as requested by another clinician or subsequent and related services requested by another clinician; this modifier is reported for patient relationships that may not be adequately captured by the above alternative categories; reporting clinician service examples include but are not limited to, the radiologist's interpretation of an imaging study requested by another clinician
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
GC This service has been performed in part by a resident under the direction of a teaching physician
26 Professional component: certain procedures are a combination of a physician or other qualified health care professional component and a technical component. when the physician or other qualified health care professional component is reported separately, the service may be identified by adding modifier 26 to the usual procedure number.
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
77 Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
90 Reference (outside) laboratory: when laboratory procedures are performed by a party other than the treating or reporting physician or other qualified health care professional, the procedure may be identified by adding modifier 90 to the usual procedure number.
91 Repeat clinical diagnostic laboratory test: in the course of treatment of the patient, it may be necessary to repeat the same laboratory test on the same day to obtain subsequent (multiple) test results. under these circumstances, the laboratory test performed can be identified by its usual procedure number and the addition of modifier 91. note: this modifier may not be used when tests are rerun to confirm initial results; due to testing problems with specimens or equipment; or for any other reason when a normal, one-time, reportable result is all that is required. this modifier may not be used when other code(s) describe a series of test results (eg, glucose tolerance tests, evocative/suppression testing). this modifier may only be used for laboratory test(s) performed more than once on the same day on the same patient.
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
GW Service not related to the hospice patient's terminal condition
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
X4 Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the patient has a problem, acute or chronic, that will be treated with surgery, radiation, or some other type of generally time-limited intervention; reporting clinician service examples include but are not limited to, the orthopedic surgeon performing a knee replacement and seeing the patient through the postoperative period
XP Separate practitioner, a service that is distinct because it was performed by a different practitioner
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
Date
Action
Notes
2013-01-01 Changed Medium Descriptor changed.
2011-01-01 Added Added
Code
Description
Code
Description
Code
Description
Code
Description
CasePilot

Get instant expert-level medical coding assistance.

Ask about:
CPT Codes Guidelines Modifiers Crosswalks NCCI Edits Compliance Medicare Coverage
Example: "What is CPT code 99213?" or "Guidelines for E/M services"