G9959 HCPCS Level II Code: Systemic antimicrobials not prescribed

Contextual Map

Every relationship of G9959 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)

• G9935 — Adenoma(s) or colorectal cancer not detected during screening colonoscopy[Sibling]— CMS HCPCS Level II code set
• G9936 — Surveillance colonoscopy - personal history of colonic polyps, colon cancer, or other malignant neoplasm of rectum, rectosigmoid junction, and anus[Sibling]— CMS HCPCS Level II code set
• G9937 — Diagnostic colonoscopy[Sibling]— CMS HCPCS Level II code set
• G9938 — Patients aged 66 or older in institutional special needs plans (snp) or residing in long-term care with pos code 32, 33, 34, 54, or 56 for more than 90 consecutive days during the six months prior to the measurement period through december 31 of the measurement period[Sibling]— CMS HCPCS Level II code set
• G9939 — Pathologists/dermatopathologists is the same clinician who performed the biopsy[Sibling]— CMS HCPCS Level II code set
• G9940 — Documentation of medical reason(s) for not on a statin (e.g., pregnancy, in vitro fertilization, clomiphene rx, esrd, cirrhosis, muscular pain and disease during the measurement period or prior year)[Sibling]— CMS HCPCS Level II code set
• G9941 — Back pain was measured by the visual analog scale (vas) within three months preoperatively and at three months (6 - 20 weeks) postoperatively[Sibling]— CMS HCPCS Level II code set
• G9942 — Patient had any additional spine procedures performed on the same date as the lumbar discectomy/laminectomy[Sibling]— CMS HCPCS Level II code set
• and 32 more

Change history

• January 1, 2018 — 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 G9959 in its code family, with their registry titles.

• G9954 — Patient exhibits 2 or more risk factors for post-operative vomiting
• G9955 — Cases in which an inhalational anesthetic is used only for induction
• G9956 — Patient received combination therapy consisting of at least two prophylactic pharmacologic anti-emetic agents of different classes preoperatively and/or intraoperatively
• G9957 — Documentation of medical reason for not receiving combination therapy consisting of at least two prophylactic pharmacologic anti-emetic agents of different classes preoperatively and/or…
• G9958 — Patient did not receive combination therapy consisting of at least two prophylactic pharmacologic anti-emetic agents of different classes preoperatively and/or intraoperatively
• G9960 — Documentation of medical reason(s) for prescribing systemic antimicrobials
• G9961 — Systemic antimicrobials prescribed
• G9962 — Embolization endpoints are documented separately for each embolized vessel and ovarian artery angiography or embolization performed in the presence of variant uterine artery anatomy
• G9963 — Embolization endpoints are not documented separately for each embolized vessel or ovarian artery angiography or embolization not performed in the presence of variant uterine artery anatomy
• G9964 — Patient received at least one well-child visit with a pcp during the performance period