Crystal's MCW Coder Hub⚕️ CPT Code 43259 — EUS Upper GI Endoscopy
Quick Reference — 43259
📋 Descriptors
Short Descriptor
Upper GI endoscopy, with endoscopic ultrasound examination
Full Descriptor
Upper gastrointestinal endoscopy including esophagus, stomach, and either the duodenum and/or jejunum as appropriate; with endoscopic ultrasound examination, including the esophagus, stomach, and either the duodenum and/or jejunum
🔬 Clinical Overview
CPT 43259 describes a comprehensive Endoscopic Ultrasound (EUS) of the upper gastrointestinal tract. The procedure uses a specialized echoendoscope — an endoscope that integrates a high-frequency ultrasound transducer at its tip — introduced transorally to visualize and interrogate the luminal wall layers and adjacent extraluminal structures.
Unlike standard upper endoscopy (EGD), which only provides mucosal surface visualization, EUS provides real-time cross-sectional ultrasound imaging of the GI wall layers (mucosa, submucosa, muscularis propria, serosa) and surrounding anatomic structures including:
- Pancreas (head, body, tail, ductal system)
- Common bile duct (CBD) and biliary system
- Mediastinal structures (lymph nodes, aorta, thoracic duct)
- Celiac axis and perigastric vasculature
- Perirectal tissues and pelvic floor (for lower EUS — not this code)
When 43259 Is Used vs. 43237
| Code | Scope of EUS | Key Distinction |
|---|---|---|
| 43237 | Esophagus only | Limited EUS, does not include stomach or duodenum |
| 43259 | Esophagus + Stomach + Duodenum/Jejunum | Comprehensive diagnostic EUS of entire upper GI tract |
Key Rule
Echoendoscope Types Used
- Radial array echoendoscope — 360-degree circumferential imaging; ideal for staging and diagnostic survey
- Linear/curved array echoendoscope — Used when FNA/FNB or therapeutic intervention is planned (though 43259 alone is diagnostic only)
✅ Includes
The following are bundled into 43259 and may not be separately reported:
- Passage of the echoendoscope through the esophagus, stomach, and duodenum/proximal jejunum
- Standard white-light mucosal inspection (the diagnostic EGD component is included)
- Acquisition of EUS still images and/or video documentation
- Real-time ultrasound assessment of GI wall layers and immediately adjacent structures
- Use of water-filled balloon or instilled water for acoustic coupling
- Doppler assessment of adjacent vascular structures (when performed as part of the EUS exam)
- Fluoroscopy guidance, if performed, is separately reportable only when medically necessary and documented1
🚫 Excludes / Do Not Report Together
Mutually Exclusive Codes
The following codes cannot be reported with 43259 without documentation of distinct, separately identifiable services:
| Code | Description | Rationale |
|---|---|---|
| 43237 | EUS, esophagus only | Inclusive — 43259 already covers the esophagus |
| 43231 | Esophagoscopy (flexible) with EUS | Different approach/scope; do not report with 43259 for same session without specific documentation |
| 43238 | EGD with EUS-guided FNA/FNB, esophagus | FNA replaces 43259; use 43238 instead when sampling performed |
| 43242 | EGD with EUS-guided FNA/FNB, stomach/duodenum | FNA of stomach/duodenum replaces 43259; use 43242 instead |
| 43240 | EGD with EUS, transmural drainage of pseudocyst | Therapeutic procedure replaces 43259 |
| 43253 | EGD with EUS and injection | Injection service replaces 43259 |
| 43254 | EGD with EUS, submucosal resection | Therapeutic service replaces 43259 |
| 43235 | Standard diagnostic EGD | Bundled into 43259; do not report separately |
Coder's Note
🌳 Code Tree
Parent Subsection
Surgery (10000-69999)
└── Digestive System (40000-49999)
└── Esophagus / Stomach / Intestines - Endoscopy
└── Endoscopy, Upper GI (43200-43499)
└── EUS - Esophagogastroduodenoscopy Family
├── 43235 — Diagnostic EGD (base code)
├── 43236 — EGD, submucosal injection
├── 43237 — EGD with EUS, esophagus only ← sibling
├── 43238 — EGD with EUS-guided FNA/FNB, esophagus
├── 43239 — EGD with biopsy
├── 43240 — EGD with EUS, transmural drainage
├── 43241 — EGD with transendoscopic tube placement
├── 43242 — EGD with EUS-guided FNA/FNB, stomach/duodenum
├── 43243 — EGD with injection of esophageal varices
├── 43244 — EGD with band ligation
├── 43245 — EGD with dilation
├── 43247 — EGD with removal of foreign body
├── 43248 — EGD with guidewire dilation
├── 43249 — EGD with balloon dilation <30 mm
├── 43250 — EGD with removal of tumor, polyp, or other lesion by hot biopsy forceps
├── 43251 — EGD with removal of polyp by snare technique
├── 43253 — EGD with EUS-guided injection
├── 43254 — EGD with EUS-guided submucosal resection
└── 43259 — EGD with EUS, esophagus/stomach/duodenum/jejunum ← THIS CODE
Esophagoscopy EUS Sibling (Different Approach)
Esophagoscopy EUS Family:
├── 43231 — Esophagoscopy with EUS (transoral, esophagus only)
└── 43232 — Esophagoscopy with EUS-guided FNA/FNB
🏥 Common ICD-10-CM Diagnoses Paired with 43259
HCC (Hierarchical Condition Category) status is noted for each code. HCC-mapped codes carry risk-adjustment significance under CMS Medicare Advantage and value-based models.
Oncology / Staging
| ICD-10-CM | Description | HCC | Notes |
|---|---|---|---|
| C25.0 | Malignant neoplasm of head of pancreas | ✅ HCC 10 | Most common indication for EUS staging |
| C25.1 | Malignant neoplasm of body of pancreas | ✅ HCC 10 | EUS evaluates vascular invasion |
| C25.2 | Malignant neoplasm of tail of pancreas | ✅ HCC 10 | |
| C25.9 | Malignant neoplasm of pancreas, unspecified | ✅ HCC 10 | Use when site not documented |
| C16.0 | Malignant neoplasm of cardia of stomach | ✅ HCC 10 | EUS T-staging, lymph node assessment |
| C16.1 | Malignant neoplasm of fundus of stomach | ✅ HCC 10 | |
| C16.9 | Malignant neoplasm of stomach, unspecified | ✅ HCC 10 | |
| C15.3 | Malignant neoplasm of upper third of esophagus | ✅ HCC 10 | EUS commonly used for locoregional staging |
| C15.5 | Malignant neoplasm of lower third of esophagus | ✅ HCC 10 | |
| C15.9 | Malignant neoplasm of esophagus, unspecified | ✅ HCC 10 | |
| C24.0 | Malignant neoplasm of extrahepatic bile duct | ✅ HCC 10 | Cholangiocarcinoma; EUS assesses ductal involvement |
| C17.0 | Malignant neoplasm of duodenum | ✅ HCC 10 |
Benign Neoplasms / Subepithelial Lesions
| ICD-10-CM | Description | HCC | Notes |
|---|---|---|---|
| D13.1 | Benign neoplasm of stomach | ❌ | GISTs, leiomyomas — EUS characterizes wall layer of origin |
| D13.2 | Benign neoplasm of duodenum | ❌ | |
| D13.6 | Benign neoplasm of pancreas | ❌ | Includes serous cystadenoma |
| D37.1 | Neoplasm of uncertain behavior, stomach | ❌ | Subepithelial lesions with uncertain histology |
| K31.7 | Polyp of stomach and duodenum | ❌ | EUS characterizes layer of origin |
Pancreatic Conditions
| ICD-10-CM | Description | HCC | Notes |
|---|---|---|---|
| K85.90 | Acute pancreatitis without necrosis or infection, unspecified | ❌ | EUS to evaluate etiology (biliary, etc.) |
| K85.91 | Acute pancreatitis with uninfected necrosis | ❌ | |
| K86.1 | Other chronic pancreatitis | ❌ | EUS assesses ductal changes, parenchymal changes, calcifications |
| K86.2 | Cyst of pancreas | ❌ | EUS characterization of pancreatic cysts; IPMN surveillance |
| K86.3 | Pseudocyst of pancreas | ❌ | EUS drainage planning |
Biliary Conditions
| ICD-10-CM | Description | HCC | Notes |
|---|---|---|---|
| K80.50 | Calculus of bile duct without cholangitis or cholecystitis, without obstruction | ❌ | EUS highly sensitive for choledocholithiasis |
| K80.51 | Calculus of bile duct without cholangitis or cholecystitis, with obstruction | ❌ | |
| K83.1 | Obstruction of bile duct | ❌ |
Lymphadenopathy / Mediastinal
| ICD-10-CM | Description | HCC | Notes |
|---|---|---|---|
| R59.0 | Localized enlarged lymph nodes | ❌ | Mediastinal or perigastric LAD under EUS evaluation |
| R59.1 | Generalized enlarged lymph nodes | ❌ | |
| J98.51 | Mediastinitis | ❌ | Uncommon; EUS for assessment |
Vascular / Portal
| ICD-10-CM | Description | HCC | Notes |
|---|---|---|---|
| K76.6 | Portal hypertension | ✅ HCC 27 | EUS evaluates portal system, varices |
| I85.00 | Esophageal varices without bleeding | ❌ | Assessment for EUS-guided intervention planning |
🔖 Modifiers Applicable to 43259
| Modifier | Name | When to Use |
|---|---|---|
| -52 | Reduced Services | EUS performed but unable to visualize all segments (e.g., EUS limited by stricture); document reason |
| -53 | Discontinued Procedure | Procedure started but terminated before completion due to extenuating circumstances (patient instability, equipment failure); bill with 53, not 52 |
| -59 | Distinct Procedural Service | When 43259 is billed alongside another procedure from a different anatomical site or separate encounter — use carefully and per payer guidelines |
| -76 | Repeat Procedure by Same Physician | Same EUS repeated same day (rare; requires documentation of separate medical necessity) |
| -77 | Repeat Procedure by Different Physician | Repeat EUS same day by different provider |
| -GY | Non-covered Service (Medicare) | When payer has determined EUS is not covered for the documented indication (e.g., surveillance without sufficient basis) |
| -GZ | Expected Denial - No ABN on File | Expected denial for medical necessity; no ABN obtained; do not use with GY simultaneously |
| -GA | ABN on File | Waiver of Liability statement on file; use when Medicare expected to deny and ABN was signed |
| -LT / -RT | Not Applicable | Bilateral modifier not applicable to upper GI endoscopy |
- Use -52 when the procedure was completed but in a lesser scope (e.g., EUS could not reach duodenum due to obstruction — still partially completed).
- Use -53 when the procedure was not completed at all and the patient was taken out of procedure (e.g., desaturation, perforation concern). For hospital outpatient (OPPS), discontinued procedures follow APC-specific rules.
🏨 MS-DRG & Inpatient Coding Considerations
Inpatient Context
CPT 43259 is a CPT (outpatient/physician) code. In the inpatient hospital setting, procedures are coded using ICD-10-PCS, not CPT. The MS-DRG is driven by ICD-10-PCS procedure codes and the principal/secondary diagnoses.
ICD-10-PCS Equivalents for Inpatient EUS
| ICD-10-PCS | Description |
|---|---|
0DJ08ZZ | Inspection, Upper Intestinal Tract, Via Natural or Artificial Opening Endoscopic |
BD10ZZZ | Plain Radiography, Esophagus (not EUS — included for contrast) |
BH40ZZZ | Ultrasonography, Gastrointestinal Tract (when distinct inpatient imaging) |
Inpatient EUS is typically coded as the Inspection root operation in the GI section (0D), approach Via Natural or Artificial Opening Endoscopic (8).
MS-DRG Groupings (Driven by Diagnosis, Not CPT)
The following MS-DRGs are commonly associated with inpatient encounters where EUS is performed, grouped under MDC 06 - Diseases and Disorders of the Digestive System:
| MS-DRG | Description | GMLOS |
|---|---|---|
| 380 | Complex Diagnoses and Procedures of the Digestive System with MCC | ~5.1 days |
| 381 | Complex Diagnoses and Procedures of the Digestive System with CC | ~3.0 days |
| 382 | Complex Diagnoses and Procedures of the Digestive System without CC/MCC | ~1.8 days |
| 432 | Cirrhosis and Alcoholic Hepatitis with MCC | ~5.2 days |
| 433 | Cirrhosis and Alcoholic Hepatitis with CC | ~3.3 days |
| 435 | Malignancy of Hepatobiliary System or Pancreas with MCC | ~5.1 days |
| 436 | Malignancy of Hepatobiliary System or Pancreas with CC | ~3.3 days |
| 437 | Malignancy of Hepatobiliary System or Pancreas without CC/MCC | ~2.0 days |
Coding Tip — Inpatient
When performing CDI or coding for an inpatient admission where EUS was performed, ensure:
- The principal diagnosis drives MDC and DRG, not the procedure.
- CC/MCC capture is critical — pancreatic malignancy (C25.0), acute pancreatitis with necrosis (K85.91), and portal hypertension (K76.6) can each shift DRG weight significantly.
- Document whether the EUS was diagnostic (Inspection) vs. therapeutic (correlate to appropriate root operation) for PCS.
💡 Coding Examples
Example 1 — Pancreatic Mass Staging
Scenario: A 62-year-old male with a 3.2 cm hypoechoic mass in the head of the pancreas identified on CT scan is referred for EUS to assess local invasion and regional lymph nodes. The gastroenterologist passes a radial echoendoscope transorally, examines the esophagus, stomach, and duodenum, and performs a comprehensive ultrasound survey of the pancreatic head. No FNA is performed at this encounter.
Codes:
Coder Notes: No FNA performed, so 43242 is not appropriate. If biopsy/FNA had been performed, 43242 would replace 43259. HCC 10 captured via C25.0.
Example 2 — Choledocholithiasis Evaluation
Scenario: A 55-year-old female with persistent common bile duct dilation on MRCP but no stone definitively seen is referred for EUS evaluation. The physician performs a full upper GI EUS from esophagus through the duodenum, visualizing the CBD and ampulla with high-frequency ultrasound.
Codes:
- Procedure: 43259
- Diagnosis: K80.50 — Calculus of bile duct without cholangitis or cholecystitis, without obstruction
Coder Notes: EUS for CBD stone evaluation is a well-accepted indication. If the stone is found and ERCP follows on a separate date, 43259 stands alone for this session.
Example 3 — Subepithelial Gastric Lesion Characterization
Scenario: A 48-year-old female was found to have a 1.8 cm subepithelial lesion in the gastric fundus on routine EGD. She is referred for EUS to determine the wall layer of origin and characterize the lesion. EUS reveals a hypoechoic lesion arising from the muscularis propria (fourth wall layer), consistent with a GIST.
Codes:
Coder Notes: The EGD is bundled into 43259; do not report 43235 separately. The diagnosis is appropriately D37.1 until pathology confirms benign vs. malignant behavior.
Example 4 — Incomplete EUS, Modifier 52
Scenario: A patient with known esophageal stricture undergoes EUS for esophageal cancer staging. The echoendoscope advances through the esophagus and stomach but cannot pass the stricture to reach the duodenum. The physician completes EUS of the esophagus and stomach only.
Codes:
Coder Notes: 43259--52 is appropriate here because the procedure was attempted and partially completed (esophagus and stomach examined) but not fully performed as described. Some payers may require a narrative report note supporting the -52 modifier.
Example 5 — EUS With Separate Standard EGD on Same Day
Scenario: A patient undergoes a routine surveillance EGD with biopsy (43239) followed by a separate EUS (43259) at the same session for evaluation of a subepithelial lesion. Both procedures are documented as distinct.
Codes:
- 43259 (primary — higher wRVU)
- 43239 — Not separately payable when performed at the same session (bundled under NCCI edits)
Coder Notes: Per NCCI (National Correct Coding Initiative), 43235, 43239, and similar diagnostic/biopsy EGDs are bundled into 43259. Do not unbundle without clear documentation of a completely separate, distinct service.
📝 Documentation Requirements
For 43259 to be medically necessary and correctly coded, the operative/procedure note must clearly document:
- Indication/Clinical Reason: Why EUS is medically necessary (e.g., staging of known malignancy, evaluation of subepithelial lesion, CBD stone evaluation)
- Scope of Examination: Explicit notation that the echoendoscope was advanced through the esophagus, stomach, and into the duodenum and/or jejunum — all segments must be documented to support 43259 vs. 43237
- Ultrasound Findings: Description of wall layer anatomy, lesion characteristics (echogenicity, layer of origin, size), and any adjacent structure evaluation (lymph nodes, vascular structures, pancreas)
- Technique: Type of echoendoscope used (radial vs. linear), use of water instillation or balloon
- Limitations: Any technical difficulties (stricture, poor visualization) must be documented to support 52 or 53 if applicable
- Absence of FNA: If no FNA/FNB was performed, this should be apparent from the report (supports use of 43259 over 43242/43238)
- Referring Indication / ICD-10 Linkage: Diagnosis must be clearly supported in the medical record
💰 Billing & Reimbursement
wRVU Summary (2025 CMS Physician Fee Schedule)2
| Component | Non-Facility RVU | Facility RVU |
|---|---|---|
| Work RVU (wRVU) | 6.40 | 6.40 |
| Practice Expense (PE) RVU | ~3.68 | ~1.15 |
| Malpractice (PLI) RVU | ~0.43 | ~0.43 |
| Total RVU (Non-Fac) | ~10.51 | ~7.98 |
Verify exact values against the current CMS Physician Fee Schedule Look-Up Tool, as conversion factors change annually.3
Endoscopy Multiple Procedure Payment Reduction (MPPR)
When 43259 is billed alongside another upper GI endoscopy in the same session:
- Medicare pays 100% for the highest-valued endoscopy
- For the second (lower-valued) endoscopy, Medicare pays the difference between that code and the base diagnostic EGD (43235)
- This is a unique MPPR rule specific to endoscopy families — it differs from the standard surgical 50/50 MPPR4
Assistant Surgeon
- Indicator: 2 — Assistant surgeon services are not payable by Medicare for this code under normal circumstances
- Some commercial payers may allow assistant coverage; verify by payer
APC Assignment (Hospital Outpatient / OPPS)5
- CPT 43259 typically falls under APC 5301 - Level 1 Upper GI Procedures or higher-weighted APCs depending on packaged services
- Under OPPS, device costs and certain supplies are packaged into the APC payment
Place of Service (POS) Considerations
| Setting | Billing Notes |
|---|---|
| Outpatient Hospital (POS 22) | Facility bills under OPPS/APC; physician bills under PFS using facility RVUs |
| ASC (POS 24) | ASC payment rate applies; physician bills separately |
| Office (POS 11) | Non-facility RVUs apply; higher total RVU |
🔗 Related Notes
- 43235 — Diagnostic EGD (base code, bundled into 43259)
- 43237 — EGD with EUS, esophagus only
- 43238 — EGD with EUS-guided FNA/FNB, esophagus
- 43242 — EGD with EUS-guided FNA/FNB, stomach/duodenum
- 43231 — Esophagoscopy with EUS
- 43240 — EGD with EUS, transmural drainage of pseudocyst
- C25.0 — Pancreatic head malignancy (most common EUS indication)
- K86.1 — Chronic pancreatitis
📚 Sources
1 AMA CPT Professional Edition, Current Year
2 CMS Physician Fee Schedule Final Rule 2025, cms.gov/medicare/payment/fee-schedules/physician
3 CMS PFS Look-Up Tool, cms.gov/medicare/payment/fee-schedules/physician/look-up
4 CMS MPPR for Endoscopy, MLN Matters Article MM8936
5 CMS OPPS/APC Addendum B, cms.gov/medicare/payment/prospective-payment-systems/hospital-outpatient