G9644 HCPCS Level II Code: Patients who abstained from smoking prior to anesthesia on the day of surgery or procedure

Contextual Map

Every relationship of G9644 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)

• G9624 — Patient not screened for unhealthy alcohol use using a systematic screening method or patient did not receive brief counseling if identified as an unhealthy alcohol user[Sibling]
• G9625 — Patient sustained bladder injury at the time of surgery or discovered subsequently up to 30 days post-surgery[Sibling]
• G9626 — Documented medical reason for not reporting bladder injury (e.g., gynecologic or other pelvic malignancy documented, concurrent surgery involving bladder pathology, injury that occurs during a urinary incontinence procedure, patient death from non-medical causes not related to surgery, patient died during procedure without evidence of bladder injury)[Sibling]
• G9627 — Patient did not sustain bladder injury at the time of surgery nor discovered subsequently up to 30 days post-surgery[Sibling]
• G9628 — Patient sustained bowel injury at the time of surgery or discovered subsequently up to 30 days post-surgery[Sibling]
• G9629 — Documented medical reasons for not reporting bowel injury (e.g., gynecologic or other pelvic malignancy documented, planned (e.g., not due to an unexpected bowel injury) resection and/or re-anastomosis of bowel, or patient death from non-medical causes not related to surgery, patient died during procedure without evidence of bowel injury)[Sibling]
• G9630 — Patient did not sustain a bowel injury at the time of surgery nor discovered subsequently up to 30 days post-surgery[Sibling]
• G9631 — Patient sustained ureter injury at the time of surgery or discovered subsequently up to 30 days post-surgery[Sibling]
• and 32 more

Change history

• January 1, 2016 — Added to the code set [Change history]

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 G9644 in its code family, with their registry titles.

• G9639 — Major amputation or open surgical bypass not required within 48 hours of the index endovascular lower extremity revascularization procedure
• G9640 — Documentation of planned hybrid or staged procedure
• G9641 — Major amputation or open surgical bypass required within 48 hours of the index endovascular lower extremity revascularization procedure
• G9642 — Current smoker (e.g., cigarette, cigar, pipe, e-cigarette or marijuana)
• G9643 — Elective surgery
• G9645 — Patients who did not abstain from smoking prior to anesthesia on the day of surgery or procedure
• G9646 — Patients with 90 day mrs score of 0 to 2
• G9647 — Patients in whom mrs score could not be obtained at 90 day follow-up
• G9648 — Patients with 90 day mrs score greater than 2
• G9649 — Psoriasis assessment tool documented meeting any one of the specified benchmarks (e.g., (pga; 5-point or 6-point scale), body surface area (bsa), psoriasis area and severity index (pasi) and/or…