G9418 HCPCS Level II Code: Primary 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…

Contextual Map

Every relationship of G9418 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Nearest codes (40)

• G9400 — Documentation of medical or patient reason(s) for not discussing treatment options; medical reasons: patient is not a candidate for treatment due to advanced physical or mental health comorbidity (including active substance use); currently receiving antiviral treatment; successful antiviral treatment (with sustained virologic response) prior to reporting period; other documented medical reasons; patient reasons: patient unable or unwilling to participate in the discussion or other patient reasons[Sibling]— CMS HCPCS Level II code set
• G9401 — No documentation in the patient record of a discussion between the physician or other qualified healthcare professional and the patient that includes all of the following: treatment choices appropriate to genotype, risks and benefits, evidence of effectiveness, and patient preferences toward treatment[Sibling]— CMS HCPCS Level II code set
• G9402 — Patient received follow-up within 30 days after discharge[Sibling]— CMS HCPCS Level II code set
• G9403 — Clinician documented reason patient was not able to complete 30 day follow-up from acute inpatient setting discharge (e.g., patient death prior to follow-up visit, patient non-compliant for visit follow-up)[Sibling]— CMS HCPCS Level II code set
• G9404 — Patient did not receive follow-up within 30 days after discharge[Sibling]— CMS HCPCS Level II code set
• G9405 — Patient received follow-up within 7 days after discharge[Sibling]— CMS HCPCS Level II code set
• G9406 — Clinician documented reason patient was not able to complete 7 day follow-up from acute inpatient setting discharge (i.e patient death prior to follow-up visit, patient non-compliance for visit follow-up)[Sibling]— CMS HCPCS Level II code set
• G9407 — Patient did not receive follow-up within 7 days after discharge[Sibling]— CMS HCPCS Level II code set
• and 32 more

Change history

• January 1, 2015 — Added to the code set [Change history]— CMS release files (code change ledger)

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, descriptors, coverage and pricing attributes Official source data

CMS HCPCS Alpha-Numeric (ANWEB) release — July 2026 quarterly update Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS HCPCS quarterly update files, ingested into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official HCPCS Level II classifications closest to G9418 in its code family, with their registry titles.

• G9413 — Patient not admitted within 180 days, status post cied implantation, replacement, or revision with an infection requiring device removal or surgical revision
• G9414 — Patient 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
• G9415 — Patient 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
• G9416 — Patient had one tetanus, diphtheria toxoids and acellular pertussis vaccine (tdap) on or between the patient's 10th and 13th birthdays
• G9417 — Patient did not have one tetanus, diphtheria toxoids and acellular pertussis vaccine (tdap) on or between the patient's 10th and 13th birthdays
• G9419 — Documentation 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…
• G9420 — Specimen site other than anatomic location of lung or is not classified as primary non-small cell lung cancer
• G9421 — Primary non-small cell lung cancer lung biopsy and cytology specimen report does not document classification into specific histologic type or histologic type does not follow iaslc guidance or is…
• G9422 — Primary lung carcinoma resection report documents pt category, pn category and for non-small cell lung cancer, histologic type (e.g., squamous cell carcinoma, adenocarcinoma and not nsclc-nos)
• G9423 — 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…