HCPCS Level II · Procedures and professional services (temporary)
G9423Documentation of medical reason for not including pt category, pn category and histologic type [for patient with appropriate exclusion criteria (e.g., metastatic disease, benign tumors, malignant tumors other than carcinomas, inadequate surgical specimens)]
✓ Active
Source: CMS HCPCS quarterly update, October 2026. Page updated September 29, 2026.
About G9423
G9423 is an HCPCS Level II code in the G series (procedures and professional services (temporary)), describing documentation of medical reason for not including pt category, pn category and histologic type [for patient with appropriate exclusion criteria (e.g., metastatic disease, benign tumors, malignant tumors other than carcinomas, inadequate surgical specimens)].
It was added to HCPCS effective 01/01/2015.
Its Medicare coverage code is "C", meaning coverage is left to the Medicare contractor's judgment.
Details
- Short description
- Med reas rpt no histo type
- Date added
- 01/01/2015
- Action effective
- 01/01/2015
- BETOS
- Z2
Related G94xx codes
- G9408Patients with cardiac tamponade and/or pericardiocentesis occurring within 30 days
- G9409Patients without cardiac tamponade and/or pericardiocentesis occurring within 30 days
- G9410Patient admitted within 180 days, status post cied implantation, replacement, or revision with an infection requiring device removal or surgical revision
- G9411Patient not admitted within 180 days, status post cied implantation, replacement, or revision with an infection requiring device removal or surgical revision
- G9412Patient admitted within 180 days, status post cied implantation, replacement, or revision with an infection requiring device removal or surgical revision
- G9413Patient not admitted within 180 days, status post cied implantation, replacement, or revision with an infection requiring device removal or surgical revision
- G9414Patient had one dose of meningococcal vaccine (serogroups a, c, w, y or a, c, w, y, b) on or between the patient's 10th and 13th birthdays
- G9415Patient did not have one dose of meningococcal vaccine (serogroups a, c, w, y or a, c, w, y, b), on or between the patient's 10th and 13th birthdays
- G9416Patient had one tetanus, diphtheria toxoids and acellular pertussis vaccine (tdap) on or between the patient's 10th and 13th birthdays
- G9417Patient did not have one tetanus, diphtheria toxoids and acellular pertussis vaccine (tdap) on or between the patient's 10th and 13th birthdays
- G9418Primary non-small cell lung cancer lung biopsy and cytology specimen report documents classification into specific histologic type following iaslc guidance or classified as nsclc-nos with an explanation
- G9419Documentation of medical reason(s) for not including the histological type or nsclc-nos classification with an explanation (e.g. specimen insufficient or non-diagnostic, specimen does not contain cancer, or other documented medical reasons)
Common questions about G9423
Is HCPCS G9423 still valid?
- Yes. G9423 is active in the CMS October 2026 HCPCS file.
Does Medicare cover G9423?
- Its coverage code is "C": coverage is left to the Medicare contractor's judgment. Check the local coverage determination for your region.