G9842 HCPCS Level II Code: Patient has metastatic disease at diagnosis

Contextual Map

Every relationship of G9842 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)

• G9822 — Patients who had an endometrial ablation procedure during the 12 months prior to the index date (exclusive of the index date)[Sibling]— CMS HCPCS Level II code set
• G9823 — Endometrial sampling or hysteroscopy with biopsy and results documented during the 12 months prior to the index date (exclusive of the index date) of the endometrial ablation[Sibling]— CMS HCPCS Level II code set
• G9824 — Endometrial sampling or hysteroscopy with biopsy and results not documented during the 12 months prior to the index date (exclusive of the index date) of the endometrial ablation[Sibling]— CMS HCPCS Level II code set
• G9825 — Her-2/neu negative or undocumented/unknown[Sibling]— CMS HCPCS Level II code set
• G9826 — Patient transferred to practice after initiation of chemotherapy[Sibling]— CMS HCPCS Level II code set
• G9827 — Her2-targeted therapies not administered during the initial course of treatment[Sibling]— CMS HCPCS Level II code set
• G9828 — Her2-targeted therapies administered during the initial course of treatment[Sibling]— CMS HCPCS Level II code set
• G9829 — Breast adjuvant chemotherapy administered[Sibling]— CMS HCPCS Level II code set
• and 32 more

Change history

• January 1, 2017 — 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 G9842 in its code family, with their registry titles.

• G9837 — Trastuzumab not administered within 12 months of diagnosis
• G9838 — Patient has metastatic disease at diagnosis
• G9839 — Anti-egfr monoclonal antibody therapy
• G9840 — Ras (kras and nras) gene mutation testing performed before initiation of anti-egfr moab
• G9841 — Ras (kras and nras) gene mutation testing not performed before initiation of anti-egfr moab
• G9843 — Ras (kras or nras) gene mutation
• G9844 — Patient did not receive anti-egfr monoclonal antibody therapy
• G9845 — Patient received anti-egfr monoclonal antibody therapy
• G9846 — Patients who died from cancer
• G9847 — Patient received systemic cancer-directed therapy in the last 14 days of life