Crystal's MCW Coder Hub👩🏾⚕️ CPT 30920 — Internal Maxillary Artery Ligation, Transantral
Full Description
CPT 30920 describes the surgical ligation of the internal maxillary artery (IMA) via a transantral approach — meaning through the maxillary sinus — for the purpose of controlling severe, refractory, or life-threatening posterior epistaxis (nosebleed) that has failed all conservative management. This is a major surgical procedure performed under general or local anesthesia, most commonly in an operating room or ASC setting.
The internal maxillary artery is a terminal branch of the external carotid artery that passes through the pterygomaxillary fissure into the pterygopalatine fossa. From there, its terminal branch — the sphenopalatine artery — enters the nasal cavity via the sphenopalatine foramen to supply the majority of the posterior nasal septum and lateral nasal wall. This vascular territory is the origin of the vast majority of posterior nosebleeds, which are notoriously difficult to control with packing alone due to deep anatomic positioning.
The Transantral Approach: The surgeon creates an incision through the upper gingival mucosa (Caldwell-Luc incision) to enter and open the anterior wall of the maxillary sinus. The posterior wall of the sinus is then carefully opened to expose the pterygomaxillary space, where the IMA runs horizontally. Once identified, the artery (and often its branches) is ligated with surgical clips, sutures, or a combination, interrupting the blood supply to the posterior nasal cavity.
Endoscopic Sphenopalatine Artery Ligation Note: In modern ENT practice, the endoscopic sphenopalatine artery (SPA) ligation (CPT 31238) has largely replaced the transantral approach due to lower morbidity, improved visualization, faster recovery, and comparable success rates (87-92%). However, 30920 remains the correct and appropriate CPT code when the transantral Caldwell-Luc technique is used, or when an endoscopic sphenopalatine/IMA ligation is performed and no more appropriate endoscopic code applies. Per AAPC guidance, 30920 is also sometimes applied to endoscopic sphenopalatine artery ligation when the coder cannot locate a more precise code — though 31238 is preferred for the purely endoscopic approach.
Anatomic Context
Understanding the vascular anatomy is critical for accurate documentation and coding:
External Carotid Artery
│
└── Internal Maxillary Artery (IMA) ←── Target of CPT 30920
│ (passes through pterygomaxillary fissure)
│
├── Middle meningeal artery
├── Inferior alveolar artery
├── Posterior superior alveolar artery
├── Infraorbital artery
├── Descending palatine artery
│
└── Sphenopalatine Artery (SPA) ←── Terminal branch; primary
│ (enters nasal cavity via supply to posterior
│ sphenopalatine foramen) nasal cavity
│
├── Posterior lateral nasal artery
└── Posterior septal arteries
Interrupting the IMA proximal to the SPA (30920) or ligating the SPA directly (31238) cuts off the dominant blood supply to the posterior nasal cavity. Because of collateral circulation from the anterior and posterior ethmoid arteries (branches of the ophthalmic artery / internal carotid system), ligation is not always 100% successful, and post-operative rebleeding from ethmoid branches may occur.
Code Family / Code Tree
Epistaxis / Nasal Hemorrhage Control (30901-30930)
│
├── 30901 - Control nasal hemorrhage, anterior
│ Simple (limited cautery and/or packing)
│ Low complexity, first attempt
│
├── 30903 - Control nasal hemorrhage, anterior
│ Complex (extensive cautery and/or packing,
│ any method)
│
├── 30905 - Control nasal hemorrhage, posterior
│ Initial (posterior nasal packs and/or cautery)
│
├── 30906 - Control nasal hemorrhage, posterior
│ Subsequent (for recurrence after initial 30905)
│
├── 30915 - Ligation arteries; ethmoidal arteries
│ (anterior and/or posterior ethmoid aa.)
│ Access via medial orbital incision or endoscopic
│
├── 30920 ◄ YOU ARE HERE
│ Ligation arteries; internal maxillary artery,
│ transantral
│ Reserved for persistent posterior epistaxis
│ refractory to packing, cautery, and less
│ invasive surgical approaches
│
└── 30930 - Fracture nasal inferior turbinate(s), therapeutic
(separate procedure; not related to hemorrhage)
Related Adjacent Codes:
├── 31238 - Nasal/sinus endoscopy, surgical; with control of
│ nasal hemorrhage (endoscopic SPA ligation — preferred
│ modern approach)
│
└── 61624 - Transcatheter permanent occlusion or embolization,
CNS (arterial embolization alternative — IR)
Escalation Logic: In clinical practice and coding, the progression from conservative to surgical hemorrhage control typically follows:
30901 → 30903 → 30905 → 30906 → 31238 (SPA endoscopic) or 30920 (transantral IMA) → embolization (IR, 61624)
Includes (Bundled — Do NOT Bill Separately)
The following are considered components of the CPT 30920 service and are not separately reportable when performed in the same operative session as part of the same procedure:
-
Caldwell-Luc incision (gingival approach to maxillary sinus)
-
Anterior and posterior maxillary sinus wall entry and visualization
-
Pterygomaxillary fossa dissection and exposure of the IMA
-
Surgical clipping or suture ligation of the IMA and/or its branches
-
Primary wound closure of gingival incision
-
Nasal endoscopy if performed solely to confirm hemostasis during the same operative session
-
Intraoperative anterior or posterior nasal packing placed as part of the same hemorrhage control attempt
-
Standard anesthesia services (billed separately by anesthesiologist, not bundled into surgeon’s claim)
-
Routine post-operative visits within the 90-day global period
-
All pre-operative evaluation on the day before and the day of surgery
Excludes / Cannot Bill With (Same Operative Session, Same Side)
| Excluded Code | Reason |
|---|---|
| 30901, 30903, 30905, 30906 | Packing/cautery attempts that preceded the ligation are bundled — do not also bill the conservative management on the same operative claim as 30920 |
| 30915 (Ethmoid artery ligation) | If performed at the same session, may be separately reportable with Modifier -51 (Multiple Procedures) — document each distinct vessel ligation separately in operative report |
| 31238 (Endoscopic SPA ligation) | Do not bill 30920 and 31238 together for the same bleeding site; select the code that best describes the technique performed |
| 31231 (Diagnostic nasal endoscopy) | Diagnostic endoscopy performed to evaluate the same hemorrhage is bundled into the surgical session |
Tip
One more tip:
Exception — Ethmoid Artery Ligation at Same Session: When the surgeon performs both IMA ligation (30920) AND ethmoid artery ligation (30915) during the same operative episode for refractory control, both codes may be reported. Append Modifier -51 (Multiple Procedures) to the secondary procedure (lower-value code). Operative documentation must clearly describe each vessel ligated distinctly.
Assistant at Surgery
| Indicator | Value |
|---|---|
| Medicare Assistant Surgeon Payable | Yes — Indicator 2 |
| CMS Payment Rate (Physician, MD/DO) | 16% of the MPFS allowable for 30920 |
| CMS Payment Rate (NP/PA/CNS as assistant) | 85% of the 16% MPFS amount |
| Applicable Modifiers | -80 (MD/DO assistant), -81 (Minimum assist), -82 (No qualified resident available), -AS (PA/NP/CNS assistant) |
Given the complexity of the transantral approach — which requires careful dissection near critical structures including branches of the trigeminal nerve, the orbit, and the pterygoid venous plexus — the use of an assistant surgeon is clinically appropriate and Medicare will consider payment when properly documented. The operative report must justify the need for surgical assistance (e.g., complexity of anatomy, significant blood loss, concurrent procedures).
wRVU and Reimbursement
| Component | Non-Facility | Facility |
|---|---|---|
| Work RVU (wRVU) | 8.52 | 8.52 |
| Practice Expense RVU | ~5.94 | ~3.35 |
| Malpractice RVU | ~1.34 | ~1.23 |
| Total RVU (approx.) | ~15.80 | ~13.10 |
| Medicare National Rate (est.) | ~560 | ~490 |
| Typical Commercial Rate Range | 1,800 | 1,400 |
Note
Note: These are approximate national values based on the 2026 CMS Conversion Factor (~$33.40) and are subject to GPCI locality adjustments. Facility rates are lower because the surgical facility bears the overhead cost of the OR, nursing, equipment, and supplies and bills separately via a facility fee (APC for outpatient/ASC; DRG for inpatient).
wRVU Context: At 8.52 wRVU, CPT 30920 carries substantially more physician work value than conservative epistaxis control codes (30901 = ~1.45 wRVU; 30905 = ~2.17 wRVU), reflecting the significantly greater intraoperative skill, time, and technical complexity of surgical arterial ligation under anesthesia.
Global Period
| Element | Detail |
|---|---|
| Global Period | 090 (90-day major surgery global) |
| Pre-op Day Included | 1 day before surgery |
| Post-op Days Included | 90 days following the surgery date |
| Total Global Window | 92 days (1 pre-op + day of surgery + 90 post-op) |
| Bundled Services | All related E/M visits, wound checks, nasal exams, packing removal, and follow-up care by the operating surgeon or same group practice |
Key Modifiers for the Global Period:
| Modifier | Use |
|---|---|
| -54 | Surgical care only (transfer post-op care to another provider) |
| -55 | Post-operative management only (receiving provider takes over post-op) |
| -58 | Staged or related procedure during global period (planned) |
| -78 | Unplanned return to OR during global period (related complication) |
| -79 | Unrelated procedure performed during global period |
| -24 | Unrelated E/M service during post-op global period |
| -57 | Decision for surgery made at the E/M visit (use on the pre-operative E/M when applicable) |
Note
E/M on Day of Surgery: If the surgeon sees the patient in the ED or office, diagnoses the severity of the epistaxis, and then decides to proceed to the OR for 30920 on the same day, the E/M service may be separately reportable with Modifier -57 (Decision for Surgery) appended to the E/M code, as this is a major surgical procedure (90-day global).
HCC (Hierarchical Condition Category)
CPT 30920 is a procedural code and does not carry direct HCC risk-adjustment weight. HCC scoring is driven entirely by ICD-10-CM diagnosis codes submitted on the claim. The primary diagnosis for most 30920 cases (R04.0, Epistaxis) is not an HCC-mapped condition under CMS-HCC v28.
However, the underlying etiology or comorbid conditions documented alongside epistaxis may carry HCC relevance and should be coded to the highest level of specificity when present:
| Underlying Condition | ICD-10-CM | HCC Relevance |
|---|---|---|
| Anticoagulant-induced hemorrhage | T45.515A/D | Monitor — drug adverse effect |
| Hereditary hemorrhagic telangiectasia (HHT/Osler-Weber-Rendu) | Q78.0 | Rare, usually not HCC |
| Coagulation defect / hemophilia | D66, D68.xx | HCC 46 (Coagulation Defects) |
| Malignant neoplasm of nasal cavity | C30.0 | HCC 10-12 (Cancer categories) |
| Hypertension (major contributor to epistaxis) | I10 | Not directly HCC but affects risk scores in some MA models |
| Thrombocytopenia | D69.6x | Context-dependent HCC mapping |
CPT 30920 itself: HCC Not Applicable.
Accurate ICD-10 coding of the root cause is critical for proper risk adjustment in Medicare Advantage patients.
MS-DRG Applicability
CPT 30920 is an outpatient CPT code. If the patient is treated and discharged from an outpatient/ASC setting, MS-DRGs do not apply. However, because refractory posterior epistaxis requiring arterial ligation often necessitates inpatient hospital admission for monitoring, resuscitation, and post-operative care, MS-DRG assignment is clinically relevant and commonly encountered with this code family.
For inpatient admissions where the primary reason is epistaxis, the case groups under MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth, and Throat):
| MS-DRG | Title | Notes |
|---|---|---|
| 150 | Epistaxis with MCC | Principal Dx = R04.0 + MCC (e.g., severe coagulopathy, blood loss anemia requiring transfusion, respiratory failure) |
| 151 | Epistaxis without MCC | Principal Dx = R04.0; no qualifying MCC on the claim |
Important Inpatient Coding Note: In the inpatient setting, ICD-10-PCS codes (not CPT codes) are used to capture the procedure. The ICD-10-PCS equivalent for transantral internal maxillary artery ligation or sphenopalatine artery ligation would be coded from the ICD-10-PCS Table 03L (Occlusion, Upper Arteries) or 0C9/0CB depending on approach:
| ICD-10-PCS Concept | Approach Code Options |
|---|---|
| Ligation of internal maxillary artery, open (transantral) | 03LF0ZZ (Occlusion of face artery, open approach) — approximate; verify with current PCS tables |
| Endoscopic SPA ligation | 09UNZZZ (Repair, nasal septum/turbinate via natural/artificial opening endoscopic) — verify |
Note
ICD-10-PCS codes change annually. Always verify against the current fiscal year’s PCS tables before final code assignment on inpatient claims.
MS-DRG Complication/Comorbidity Impact:
-
A patient with R04.0 (epistaxis) as principal diagnosis who also has documented coagulopathy (D68.9), thrombocytopenia (D69.59), or requires a blood transfusion will likely have an MCC, shifting the case from DRG 151 → DRG 150, which carries a significantly higher reimbursement weight.
-
Document and code all documented comorbidities and complications that were present on admission or developed during the stay.
Common ICD-10-CM Diagnosis Codes Paired with CPT 30920
Primary Epistaxis Diagnosis
| ICD-10-CM | Description |
|---|---|
| R04.0 | Epistaxis (primary diagnosis for almost all 30920 claims; the single valid ICD-10-CM code for nosebleed) |
Note
R04.0 is a non-lateralized, non-staged code. There is no R04.0 right or R04.0 left — laterality for epistaxis is captured via CPT modifier (-LT/-RT/-50), not by diagnosis code. R04.0 is the only ICD-10-CM epistaxis code; specificity comes from the etiology codes listed below.
Underlying Etiology / Contributing Conditions (Code Additionally)
| ICD-10-CM | Description |
|---|---|
| I10 | Essential (primary) hypertension — extremely common comorbidity in epistaxis patients |
| I15.0 | Renovascular hypertension |
| I15.9 | Secondary hypertension, unspecified |
| D68.9 | Coagulation defect, unspecified |
| D68.32 | Hemorrhagic disorder due to extrinsic circulating anticoagulants |
| D69.3 | Immune thrombocytopenic purpura |
| D69.59 | Other secondary thrombocytopenia |
| D66 | Hereditary factor VIII deficiency (Hemophilia A) |
| D67 | Hereditary factor IX deficiency (Hemophilia B) |
| Q78.0 | Hereditary hemorrhagic telangiectasia (Osler-Weber-Rendu syndrome) |
| J34.89 | Other specified disorders of nose and nasal sinuses |
| J34.0 | Abscess, furuncle, and carbuncle of nose (when septal pathology contributing) |
| C30.0 | Malignant neoplasm of nasal cavity (when tumor is bleeding source) |
| D10.0 | Benign neoplasm of lip (if facial/nasal angiofibroma — consider D10.6 for pharynx) |
| J32.0 | Chronic maxillary sinusitis (frequently present due to transantral approach territory) |
| S09.90XA | Unspecified injury of head, initial encounter (traumatic epistaxis) |
| S09.90XD | Unspecified injury of head, subsequent encounter |
| T45.515A | Adverse effect of anticoagulants, initial encounter (warfarin, heparin, DOAC-induced hemorrhage) |
| T45.515D | Adverse effect of anticoagulants, subsequent encounter |
| Z79.01 | Long-term (current) use of anticoagulants |
| Z79.02 | Long-term (current) use of antithrombotics/antiplatelets |
| Z87.39 | Personal history of other musculoskeletal disorders (prior nasal trauma hx) |
Post-Procedure / Follow-Up Encounters
| ICD-10-CM | Description |
|---|---|
| T81.89XA | Other complications of procedures, NEC, initial encounter |
| T79.2XXA | Traumatic secondary and recurrent hemorrhage, initial (rebleeding) |
| Z48.89 | Encounter for other specified surgical aftercare |
| Z09 | Encounter for follow-up examination after completed treatment |
| J32.0 | Chronic maxillary sinusitis (may develop post Caldwell-Luc approach) |
Key Complication / Post-Procedure ICD-10 Coding
Post-operative complications following the transantral Caldwell-Luc/IMA ligation approach that should be captured if they develop and are documented:
| Complication | ICD-10-CM |
|---|---|
| Surgical site infection | T81.40xA-T81.49xA (infection following procedure) |
| Facial numbness / infraorbital nerve injury | G57.80 (mononeuropathy of other peripheral nerve) or S04.xxx |
| Sinusitis post Caldwell-Luc | J32.0 (Chronic maxillary sinusitis) |
| Recurrent epistaxis post-ligation | R04.0 + T79.2xxD |
| Oroantral fistula | J32.0 + Q35.x (if congenital) or K11.x (if oral) |
| Diplopia (orbital floor involvement) | H53.2 |
Coding Examples
Example 1 — Refractory Posterior Epistaxis, Transantral IMA Ligation, ASC
Clinical Scenario: A 61-year-old hypertensive male presents to the ED with severe posterior epistaxis. He has undergone two previous attempts at posterior packing (30905 on Day 1, 30906 on Day 2) that failed to achieve hemostasis. He is taken to the ASC on Day 3 for transantral internal maxillary artery ligation. The ENT surgeon performs a Caldwell-Luc incision, enters the maxillary sinus, exposes the pterygomaxillary fossa, identifies the IMA, and clips it along with its terminal branches.
Surgeon Bills (Day 3 — Operative Claim):
CPT: 30920 - Ligation arteries; internal maxillary artery, transantral
ICD-10: R04.0 - Epistaxis
I10 - Essential hypertension
The previous 30905 (Day 1) and 30906 (Day 2) are billed separately on their respective dates of service. They are NOT included in or bundled into the 30920 claim because they occurred on different dates. Once 30920 is billed, the 90-day global period begins.
Example 2 — Inpatient Admission, Anticoagulant-Induced Epistaxis
Clinical Scenario: A 74-year-old Medicare patient on warfarin for chronic atrial fibrillation develops catastrophic posterior epistaxis with supratherapeutic INR. She requires inpatient admission, IV fluid resuscitation, warfarin reversal, and surgical IMA ligation. She is admitted and the ligation is performed in the hospital OR.
Inpatient Facility Claim (ICD-10 codes drive DRG grouping):
Principal Dx: R04.0 - Epistaxis
Secondary Dx: D68.32 - Hemorrhagic disorder due to extrinsic anticoagulants
T45.515A - Adverse effect of anticoagulants, initial encounter
I48.91 - Unspecified atrial fibrillation
I10 - Essential hypertension
Z79.01 - Long-term use of anticoagulants
Procedure (ICD-10-PCS): [Verify current-year PCS code for arterial ligation]
MS-DRG: 150 - Epistaxis with MCC
(D68.32 qualifies as MCC → DRG 150 over DRG 151)
Physician (Surgeon) Bills Separately (MPFS):
CPT: 30920 - Ligation arteries; internal maxillary artery, transantral
POS: 21 (Inpatient Hospital)
ICD-10: R04.0, D68.32, T45.515A
Example 3 — Bilateral IMA Ligation
Clinical Scenario: Patient with hereditary hemorrhagic telangiectasia (HHT/Osler-Weber-Rendu) presents with bilateral recurrent life-threatening posterior epistaxis. After failure of multiple nasal packing attempts on both sides, the ENT surgeon performs bilateral transantral internal maxillary artery ligation in one operative session.
CPT: 30920-50 - Ligation arteries; internal maxillary artery, transantral, bilateral
(OR: two line items — 30920-RT and 30920-LT per payer preference)
ICD-10: R04.0 - Epistaxis
Q78.0 - Hereditary hemorrhagic telangiectasia
Important
Always verify payer policy on how to report bilateral procedures. Some payers require Modifier -50 on a single line; others require separate line items with -LT/-RT. Medicare generally accepts -50 on a single line for bilateral procedures.
Example 4 — Ethmoid Artery Ligation at Same Session
Clinical Scenario: During the transantral IMA ligation, hemostasis is achieved for the posterior supply, but the surgeon also identifies an actively bleeding anterior ethmoid artery via the orbit and elects to perform an ethmoid artery ligation via medial canthal incision during the same anesthetic event.
CPT: 30920-50 - Ligation arteries; internal maxillary artery, transantral, bilateral
(OR: two line items — 30920-RT and 30920-LT per payer preference)
ICD-10: R04.0 - Epistaxis
Q78.0 - Hereditary hemorrhagic telangiectasia
Note
Example 5 — Surgeon Sees Patient in ED, Decides on Surgery
Clinical Scenario: ENT is called to the ED for a patient with massive posterior epistaxis. The ENT physician evaluates the patient in the ED and makes the decision to take the patient to the OR the same day for IMA ligation.
ED/E/M Encounter:
CPT: 99285-57 - ED E/M level 5, Modifier -57 (Decision for major surgery)
ICD-10: R04.0
Operative Claim (same day or next day):
CPT: 30920 - Ligation arteries; internal maxillary artery, transantral
ICD-10: R04.0, I10
Note
Modifier -57 is critical here. Without it, Medicare will likely bundle and deny the E/M service into the 90-day major surgery global package. -57 signals that the E/M was the decision-making encounter, not a routine post-op visit.
Key Coding Pearls
-
R04.0 is the only ICD-10-CM epistaxis code. Unlike many body systems, epistaxis does not have lateralized ICD-10-CM codes. Laterality is expressed through CPT modifiers (-LT, -RT, -50), not diagnosis codes.
-
Escalation matters for audit defense. Payers and Medicare expect documentation showing conservative management was attempted before 30920. The medical record should reflect the failed prior treatments (packing attempts, cautery, prior 30905/30906 encounters) before surgical ligation was undertaken.
-
30920 vs. 31238: The transantral approach (30920) is the older, more invasive Caldwell-Luc technique. The endoscopic nasal approach targeting the sphenopalatine artery (31238) is the modern preferred method. Select the code that matches the documented operative technique, not the diagnosis.
-
Global Period and the ED Visit: When the decision for 30920 is made in the ED or clinic on the same day as surgery, always use Modifier -57 on the E/M code to preserve billing for the evaluation encounter.
-
MCC Documentation Drives DRG Revenue: For inpatient cases, ensure all complications and comorbidities are fully documented and coded. D68.32 (anticoagulant-induced hemorrhage), D69.59 (thrombocytopenia), or blood transfusion administration can shift a case from DRG 151 → DRG 150, potentially doubling the facility’s reimbursement.
-
Modifier -22 (Increased Procedural Complexity): Append when the operative report documents significantly greater difficulty than typical (e.g., severe scarring from prior Caldwell-Luc, anomalous vascular anatomy, concurrent massive hemorrhage requiring resuscitation intraoperatively). Provide a cover letter and detailed documentation; expect ~20-30% additional reimbursement if approved.
-
ICD-10-PCS for Inpatient: When coding the same case in the inpatient hospital setting, you must assign an ICD-10-PCS procedure code from the Medical and Surgical Section (0) — NOT a CPT code. Facility coding and physician billing are entirely separate code sets in the inpatient environment.
-
Frequency/Prior Auth: Commercial payers and Medicare may require prior authorization for 30920 given its major surgery classification. Many payers will also expect documentation of at least two failed conservative attempts (posterior packing) before authorizing surgical ligation.