G9837 HCPCS Level II Code: Trastuzumab not administered within 12 months of diagnosis

Contextual Map

Every relationship of G9837 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)

• G9817 — Death did not occur after discharge from the hospital within 30 days post procedure[Sibling]— CMS HCPCS Level II code set
• G9818 — Documentation of sexual activity[Sibling]— CMS HCPCS Level II code set
• G9819 — Patients who use hospice services any time during the measurement period[Sibling]— CMS HCPCS Level II code set
• G9820 — Documentation of a chlamydia screening test with proper follow-up[Sibling]— CMS HCPCS Level II code set
• G9821 — No documentation of a chlamydia screening test with proper follow-up[Sibling]— CMS HCPCS Level II code set
• 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
• and 32 more

Change history (2)

• January 1, 2021 — Removed from the code set [Change history]— CMS release files (code change ledger)
• and 1 more

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 G9837 in its code family, with their registry titles.

• G9832 — Ajcc stage at breast cancer diagnosis = i (ia or ib) and t-stage at breast cancer diagnosis = t1c
• G9833 — Patient transfer to practice after initiation of chemotherapy
• G9834 — Patient has metastatic disease at diagnosis
• G9835 — Trastuzumab administered within 12 months of diagnosis
• G9836 — Reason for not administering trastuzumab documented (e.g. patient declined, patient died, patient transferred, contraindication or other clinical exclusion, neoadjuvant chemotherapy or radiation not…
• 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
• G9842 — Patient has metastatic disease at diagnosis