G8645 HCPCS Level II Code: I intend to report the asthma measures group

Contextual Map

Every relationship of G8645 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)

• G8600 — Iv thrombolytic therapy initiated within 4.5 hours (<= 270 minutes) of time last known well[Sibling]
• G8601 — Iv thrombolytic therapy not initiated within 4.5 hours (<= 270 minutes) of time last known well for reasons documented by clinician (e.g. patient enrolled in clinical trial for stroke, patient admitted for elective carotid intervention)[Sibling]
• G8602 — Iv thrombolytic therapy not initiated within 4.5 hours (<= 270 minutes) of time last known well, reason not given[Sibling]
• G8627 — Surgical procedure performed within 30 days following cataract surgery for major complications (e.g., retained nuclear fragments, endophthalmitis, dislocated or wrong power iol, retinal detachment, or wound dehiscence)[Sibling]
• G8628 — Surgical procedure not performed within 30 days following cataract surgery for major complications (e.g., retained nuclear fragments, endophthalmitis, dislocated or wrong power iol, retinal detachment, or wound dehiscence)[Sibling]
• G8629 — Documentation of order for prophylactic parenteral antibiotic to be given within one hour (if fluoroquinolone or vancomycin, two hours) prior to surgical incision (or start of procedure when no incision is required)[Sibling]
• G8630 — Documentation that administration of prophylactic parenteral antibiotics was initiated within one hour (if fluoroquinolone or vancomycin, two hours) prior to surgical incision (or start of procedure when no incision is required), as ordered[Sibling]
• G8631 — Clinician documented that patient was not an eligible candidate for ordering prophylactic parenteral antibiotics to be given within one hour (if fluoroquinolone or vancomycin, two hours) prior to surgical incision (or start of procedure when no incision is required)[Sibling]
• and 32 more

Change history (2)

• January 1, 2017 — Removed from the code set [Change history]
• and 1 more

Sources for this page

Every coding fact on this page is read from the datasets below. Nothing is AI-generated; MedCoder-derived relationships and editorial are labelled where they appear.

Code, descriptors, coverage and pricing attributes

CMS HCPCS Alpha-Numeric (ANWEB) release — July 2026 quarterly update

Change history and date-of-service validity

CMS HCPCS quarterly update files, ingested into the change ledger

Comparisons, relationships and the contextual map MedCoder-derived

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

All data sources and release dates

Nearest Codes in This Family

Official HCPCS Level II classifications closest to G8645 in its code family, with their registry titles.

• G8631 — Clinician documented that patient was not an eligible candidate for ordering prophylactic parenteral antibiotics to be given within one hour (if fluoroquinolone or vancomycin, two hours) prior to…
• G8632 — Prophylactic parenteral antibiotics were not ordered to be given or given within one hour (if fluoroquinolone or vancomycin, two hours) prior to the surgical incision (or start of procedure when no…
• G8633 — Pharmacologic therapy (other than minerals/vitamins) for osteoporosis prescribed
• G8634 — Clinician documented patient not an eligible candidate to receive pharmacologic therapy for osteoporosis
• G8635 — Pharmacologic therapy for osteoporosis was not prescribed, reason not given
• G8646 — All quality actions for the applicable measures in the asthma measures group have been performed for this patient
• G8647 — Residual score for the knee impairment successfully calculated and the score was equal to zero (0) or greater than zero (> 0)
• G8648 — Residual score for the knee impairment successfully calculated and the score was less than zero (< 0)
• G8649 — Risk-adjusted functional status change residual score for the knee impairment not measured because the patient did not complete the fs status survey near discharge, patient not appropriate
• G8650 — Residual score for the knee impairment not measured because the patient did not complete the lepf prom at initial evaluation and/or near discharge, reason not given