G9450 HCPCS Level II Code: History of injection drug use
Medicare Coverage & Payment
- CMS short descriptor: Hx injec drug use
- Medicare coverage: Carrier judgment (CMS coverage code C)
- Payment category: Service not separately priced (pricing indicator 00)
- BETOS: Z2 — Undefined codes
- Last CMS action effective: January 1, 2022
- Terminated: December 31, 2021
Source: CMS HCPCS Level II release. Coverage codes indicate how Medicare treats the code, not whether a specific claim will be paid; payer policy and documentation still govern.
Code Set: Removed from the code set — not valid on or after January 1, 2022.
Contextual Map
Every relationship of G9450 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)
- G9426 — Improvement in median time from ed arrival to initial ed oral or parenteral pain medication administration performed for ed admitted patients[Sibling]— CMS HCPCS Level II code set
- G9427 — Improvement in median time from ed arrival to initial ed oral or parenteral pain medication administration not performed for ed admitted patients[Sibling]— CMS HCPCS Level II code set
- G9428 — Pathology report includes the pt category, thickness, ulceration and mitotic rate, peripheral and deep margin status and presence or absence of microsatellitosis for invasive tumors[Sibling]— CMS HCPCS Level II code set
- G9429 — Documentation of medical reason(s) for not including pt category, thickness, ulceration and mitotic rate, peripheral and deep margin status and presence or absence of microsatellitosis for invasive tumors (e.g., negative skin biopsies, insufficient tissue, or other documented medical reasons)[Sibling]— CMS HCPCS Level II code set
- G9430 — Specimen site other than anatomic cutaneous location[Sibling]— CMS HCPCS Level II code set
- G9431 — Pathology report does not include the pt category, thickness, ulceration and mitotic rate, peripheral and deep margin status and presence or absence of microsatellitosis for invasive tumors[Sibling]— CMS HCPCS Level II code set
- G9432 — Asthma well-controlled based on the act, c-act, acq, or ataq score and results documented[Sibling]— CMS HCPCS Level II code set
- G9433 — Death, permanent nursing home resident or receiving hospice or palliative care any time during the measurement period[Sibling]— CMS HCPCS Level II code set
- and 32 more
Change history (2)
- January 1, 2022 — 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
Change history
- January 1, 2022Removed from the code setHistory of injection drug use
- January 1, 2015Added to the code setHistory of injection drug use
Nearest Codes in This Family
Official HCPCS Level II classifications closest to G9450 in its code family, with their registry titles.
- G9441 — Statin prescribed at discharge
- G9442 — Statin not prescribed for documented reasons (e.g., allergy, medical intolerance)
- G9443 — Statin not prescribed at discharge
- G9448 — Patients who were born in the years 1945 to 1965
- G9449 — History of receiving blood transfusions prior to 1992
- G9451 — Patient received one-time screening for hcv infection
- G9452 — Documentation of medical reason(s) for not receiving hcv antibody test due to limited life expectancy
- G9453 — Documentation of patient reason(s) for not receiving one-time screening for hcv infection (e.g., patient declined, other patient reasons)
- G9454 — One-time screening for hcv infection not received within 12-month reporting period and no documentation of prior screening for hcv infection, reason not given
- G9455 — Patient underwent abdominal imaging with ultrasound, contrast enhanced ct or contrast mri for hcc