7.3 Detachment & Amputation Coding

AHIMA Certified Coding Specialist CCS

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1 Chapter 1: ICD-10-CM Diagnosis Coding Fundamentals & UHDDS Guidelines

1.1 ICD-10-CM Structure, Formats, and Core Conventions 1.2 UHDDS Principal Diagnosis Selection Rules 1.3 Secondary Diagnoses Reporting & Present on Admission (POA) Indicators

2 Chapter 2: Circulatory, Cardiac & Vascular Inpatient Coding

2.1 Hypertension, Hypertensive Heart & Chronic Kidney Disease, and CAD 2.2 Acute Myocardial Infarction (AMI) Types & Sequencing 2.3 Heart Failure Types, Acuity & Cardiomyopathy 2.4 Cerebrovascular Disease, Acute Stroke, and Late Effects

3 Chapter 3: Respiratory, Sepsis & Infectious Conditions Coding

3.1 Sepsis, Severe Sepsis, and Septic Shock Guidelines 3.2 Pneumonias, Aspiration Pneumonia, and Influenza 3.3 COPD, Asthma, and Acute Respiratory Failure

4 Chapter 4: Renal, Endocrine, Gastrointestinal & Nutritional Disorders

4.1 Acute Kidney Injury (AKI) & Chronic Kidney Disease (CKD) 4.2 Diabetes Mellitus Types, Manifestations & Complications 4.3 Protein-Calorie Malnutrition & Endocrine Emergencies 4.4 Gastrointestinal Bleeding, Ulcers, and Acute Abdominal Pathologies

5 Chapter 5: Neoplasms, Obstetrics, Perinatal, Injury & Trauma Coding

5.1 Neoplasm Table, Primary, Secondary & Encounters for Therapy 5.2 Obstetrics, Normal/Complicated Deliveries & Puerperium 5.3 Perinatal Conditions & Congenital Malformations 5.4 Traumatic Injuries, Fractures & 7th Character Extensions

6 Chapter 6: ICD-10-PCS Architecture, Conventions & Approaches

6.1 ICD-10-PCS 7-Character System Architecture & Conventions 6.2 ICD-10-PCS The Seven Surgical Approaches 6.3 General PCS Guidelines & Multiple Procedure Rules

7 Chapter 7: ICD-10-PCS Root Operations: Cutting Out, Taking Out & Altering Body Parts

7.1 Excision vs Resection vs Destruction 7.2 Extraction, Drainage, and Extirpation 7.3 Detachment & Amputation Coding 7.4 Release vs Division

8 Chapter 8: ICD-10-PCS Root Operations: Putting In, Putting Back & Moving Body Parts

8.1 Replacement vs Supplement vs Insertion 8.2 Reposition, Transfer, and Reattachment 8.3 Bypass, Dilation, Occlusion, and Restriction

9 Chapter 9: High-Volume Inpatient Surgical & Medical Procedures in ICD-10-PCS

9.1 Coronary Artery Bypass Grafting (CABG) & Percutaneous Coronary Interventions 9.2 Total Joint Arthroplasties & Spinal Fusion 9.3 Mechanical Ventilation & Extracorporeal Therapies

10 Chapter 10: Outpatient CPT & HCPCS Level II Coding & Modifiers

10.1 CPT Evaluation and Management (E/M) Guidelines 10.2 CPT Surgical, Radiology, Pathology & HCPCS Level II Coding 10.3 CPT Modifiers in Hospital Outpatient & Professional Coding

11 Chapter 11: Inpatient Record Review, Clinical Validation & Documentation Integrity

11.1 Inpatient Health Record Analysis & UHDDS Documentation Hierarchy 11.2 Clinical Validation of Diagnoses vs Coding Compliance 11.3 Identifying Reportable Secondary Conditions & Complications

12 Chapter 12: Compliant Provider Queries & AHIMA/ACDIS Standards

12.1 AHIMA/ACDIS Compliant Query Standards & Ethical Principles 12.2 Compliant Query Formats: Open-Ended, Multiple-Choice & Yes/No 12.3 High-Impact Clinical Query Scenarios & Provider Workflow

13 Chapter 13: Inpatient Prospective Payment System (IPPS) & MS-DRG Mechanics

13.1 IPPS Reimbursement Structure & MS-DRG Grouping Logic 13.2 Complications and Comorbidities (CC) & Major CC (MCC) Impact 13.3 All-Patient Refined DRG (APR-DRG) System 13.4 Inpatient Transfer Policies, Cost Outliers & Short-Stay Rules

14 Chapter 14: Outpatient Reimbursement, Coding Edits & Fraud/Abuse Compliance

14.1 Hospital Outpatient Prospective Payment System (OPPS) & APCs 14.2 National Correct Coding Initiative (NCCI) Edits & MUEs 14.3 Hospital-Acquired Conditions (HAC) Reduction & Quality Programs 14.4 Healthcare Fraud, Abuse Laws, Audits & AHIMA Ethical Standards

15 Chapter 15: Health Information Technology, CAC, Encoders & Data Security

15.1 Electronic Health Records (EHR) & Computer-Assisted Coding (CAC) 15.2 Logic-Based Encoders, Groupers & Health Data Systems 15.3 HIPAA Privacy/Security, Cybersecurity & Internal Coding Audits

7.3 Detachment & Amputation Coding

Key Takeaways Explain This Topic AI

Detachment (Root Operation 6) is defined exclusively as cutting off all or part of the upper or lower extremities, and is restricted strictly to Tables 0X6 (Upper Extremities) and 0Y6 (Lower Extremities) in Section 0.

Character 7 (Qualifier) in Detachment specifies the precise longitudinal anatomical level of amputation: High (proximal third), Mid (middle third), Low (distal third), Complete (joint disarticulation), or Ray (amputation through metacarpal/metatarsal bone).

A Ray Amputation involves cutting through the metatarsal or metacarpal shaft to remove the digit along with its corresponding ray, coded with the Ray qualifier; digital disarticulation through the MTP/MCP joint without bone transection is coded as Complete Detachment of the digit.

Re-amputation advancing to a higher extremity segment is coded to Detachment (6) of the new body part, whereas revision/debridement of an amputation stump without advancing to a higher level is coded to Excision (B) of bone or soft tissue.

Last updated: August 2026

Detachment & Amputation Coding

AHIMA CCS Exam Focus: In ICD-10-PCS, surgical amputations of the limbs are governed by the dedicated root operation Detachment ( 6 ) . On the AHIMA CCS examination, candidates are tested on the strict anatomical boundaries of Detachment (which applies only to the extremities), the precise selection of Character 7 level qualifiers (High, Mid, Low, Complete, Ray), the coding mechanics of Ray amputations , and how to distinguish an open stump revision (Excision) from a re-amputation to a higher level.

1. Root Operation Detachment: Definition and Exclusive Scope
Official Definition

Detachment ( 6 ): Cutting off all or part of the upper or lower extremities.

Strict Anatomical Confinement

Detachment is unique in ICD-10-PCS because it is confined strictly to two specific body systems in Section 0 (Medical and Surgical):

0X — Anatomical Regions, Upper Extremities (Table 0X6 )

0Y — Anatomical Regions, Lower Extremities (Table 0Y6 ) ┌─────────────────────────────────────────────────────────────────────────────┐

│ MANDATORY SCOPE RULE FOR DETACHMENT │
├─────────────────────────────────────────────────────────────────────────────┤
│ • Detachment applies EXCLUSIVELY to upper and lower extremity amputations. │
│ • Amputations of non-extremity structures are NEVER coded to Detachment: │
│ - Amputation of the Penis -> Resection / Excision of Penis (Table 0VT/0VB)│
│ - Amputation / Resection of the Nose -> Resection / Excision of External │
│ Nose (Table 09T/09B) │
│ - Amputation of the External Ear -> Resection of External Ear (Table 09T) │
│ - Amputation of the Cervix -> Resection / Excision of Cervix (Table 0UT) │
└─────────────────────────────────────────────────────────────────────────────┘
2. Character 4 (Body Part) and Character 7 (Level Qualifiers)

In Detachment tables 0X6 and 0Y6 , Character 4 identifies the general extremity segment (e.g., Upper Arm, Lower Arm, Hand, Upper Leg, Lower Leg, Foot, Finger, Toe), while Character 7 (Qualifier) defines the precise longitudinal level where the transection occurs. ┌─────────────────────────────────────────────────────────────────────────────┐

│ LONGITUDINAL DETACHMENT QUALIFIER LEVELS │
├──────────────┬──────────────────────────────────────────────────────────────┤
│ Qualifier │ Anatomical Level and Clinical Meaning │
├──────────────┼──────────────────────────────────────────────────────────────┤
│ High │ Amputation through the PROXIMAL THIRD of the limb segment │
├──────────────┼──────────────────────────────────────────────────────────────┤
│ Mid │ Amputation through the MIDDLE THIRD of the limb segment │
├──────────────┼──────────────────────────────────────────────────────────────┤
│ Low │ Amputation through the DISTAL THIRD of the limb segment │
├──────────────┼──────────────────────────────────────────────────────────────┤
│ Complete │ Amputation through the PROXIMAL JOINT (Disarticulation) │
├──────────────┼──────────────────────────────────────────────────────────────┤
│ Ray │ Amputation through the METACARPAL or METATARSAL bone shaft │
└──────────────┴──────────────────────────────────────────────────────────────┘
Upper Extremity Detachment Matrix (Table 0X6)

Body Part (Char 4) High Qualifier Mid Qualifier Low Qualifier Complete Qualifier

8 Upper Arm, Right / 9 Upper Arm, Left Proximal 1/3 Humerus Mid-shaft Humerus Distal 1/3 (Supracondylar) Shoulder Disarticulation / Forequarter

D Lower Arm, Right / E Lower Arm, Left Proximal 1/3 Radius/Ulna Mid-shaft Radius/Ulna Distal 1/3 Radius/Ulna Elbow Disarticulation

J Hand, Right / K Hand, Left — — — Wrist Disarticulation / Transcarpal

Finger / Thumb Body Parts Proximal Phalanx Middle Phalanx Distal Phalanx MCP Joint Disarticulation / Ray Amputation

Lower Extremity Detachment Matrix (Table 0Y6)

Body Part (Char 4) High Qualifier Mid Qualifier Low Qualifier Complete Qualifier

6 Upper Leg, Right / 7 Upper Leg, Left Proximal 1/3 Femur / Subtrochanteric Mid-shaft Femur (Mid-AKA) Distal 1/3 Femur (Supracondylar AKA) Hip Disarticulation / Hemipelvectomy

H Lower Leg, Right / J Lower Leg, Left Proximal 1/3 Tibia/Fibula Mid-shaft Tibia/Fibula (Mid-BKA) Distal 1/3 Tibia/Fibula (Low-BKA) Knee Disarticulation

N Foot, Right / P Foot, Left — Midfoot (Chopart/Lisfranc) — Ankle Disarticulation (Syme's) / Transmetatarsal
Toe Body Parts — — Distal / Mid Phalanx MTP Disarticulation / Ray Amputation
3. Ray Amputations of the Fingers and Toes

A Ray Amputation is a specific surgical technique where a digit is removed along with a portion or the entirety of its corresponding metacarpal bone (in the hand) or metatarsal bone (in the foot).

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Ray Coding Rules on the CCS Exam

Ray Amputation: When the surgeon removes a toe and transects its metatarsal, code the applicable foot body part— M right or N left in the current table—and the qualifier for the specific complete or partial ray. For example, complete right first-ray detachment is 0Y6M0Z4 , while complete right second-ray detachment is 0Y6M0Z5 .

Digital Disarticulation: When the surgeon disarticulates only the toe through its joint without transecting the metatarsal, use the specific toe body part and its applicable level qualifier.

Broader Foot Amputations: Transmetatarsal and ankle-level procedures require the precise operative level and current table. Do not infer a qualifier from another body-part row.

4. Revision of Amputation Stump vs Re-Amputation

One of the classic discriminators on the AHIMA CCS examination is evaluating postoperative complications at an amputation stump (such as wound dehiscence, osteomyelitis, or stump necrosis) and determining whether the surgical intervention represents an Excision (Stump Revision) or a Detachment (Re-Amputation) . ┌─────────────────────────────────────────────────────────────────────────────┐

│ REVISION OF STUMP vs RE-AMPUTATION TO HIGHER LEVEL │
├───────────────────────────────┬─────────────────────────────────────────────┤
│ CRITERIA │ CODING ACTION │
├───────────────────────────────┼─────────────────────────────────────────────┤
│ Case 1: Re-Amputation to a │ Code to ROOT OPERATION DETACHMENT (6) │
│ Higher Extremity Body Part │ Select the new, higher Body Part and │
│ (e.g., Below-Knee converted │ appropriate level Qualifier │
│ to Above-Knee Amputation) │ Example: 0Y6C0Z2 (Detachment at Right Upper Leg, Mid)│
├───────────────────────────────┼─────────────────────────────────────────────┤
│ Case 2: Stump Revision at │ Code to ROOT OPERATION EXCISION (B) │
│ the Same Anatomical Level │ 1. Excision of Skin / Subcut Tissue (Table │
│ (e.g., Debridement of soft │ 0HB / 0JB) for soft tissue debridement │
│ tissue and trimming 1 cm bone │ 2. Excision of Bone (Table 0QB/0PB) for │
│ spur without limb re-section) │ bone trimming/re-contouring │
└───────────────────────────────┴─────────────────────────────────────────────┘
Clinical Case Comparison
Case A: True Re-Amputation (Detachment)

Operative Narrative: A patient with a previous right transtibial (below-knee) amputation develops refractory gangrene ascending to the knee. The surgeon brings the patient to the operating room and performs a transfemoral above-knee amputation through the middle third of the right femur.

Coding Decision: Because the limb was transected at a new, higher anatomical body part (Upper Leg), this is a true amputation.

Code: 0Y6C0Z2 ( Detachment at Right Upper Leg, Mid, Open Approach ).

Case B: Open Stump Revision (Excision)

Operative Narrative: A patient with a right below-knee amputation stump presents with skin necrosis and a protruding tibial bone spur. The surgeon opens the stump, excises 2 cm of devitalized skin and subcutaneous tissue, and uses an oscillating bone saw to resect 1 cm of distal tibia to smooth the weight-bearing contour. The limb level remains a below-knee stump.

Coding Decision: No new limb detachment was executed; the procedure was performed to remodel and debride the existing stump.

Codes:

the current Excision code for the documented right lower-leg skin/subcutaneous tissue and fascia
0QBG0ZZ ( Excision of Right Tibia, Open )
5. Summary Grid of Amputation Coding Rules

Clinical Description Target Body Part Level / Action Correct Root Operation Assigned Code Pattern
Below-Knee Amputation (distal 1/3) Lower Leg, Right ( H ) Low Level ( 3 ) Detachment ( 6 ) 0Y6H0Z3
Above-Knee Amputation (mid-thigh) Upper Leg, Left ( D ) Mid Level ( 2 ) Detachment ( 6 ) 0Y6D0Z2
Shoulder Disarticulation Shoulder Region, Right ( 2 ) Complete at shoulder Detachment ( 6 ) 0X620ZZ

Syme-type ankle disarticulation Foot/ankle level Verify exact documented level Detachment ( 6 ) Select from current table

Complete right 2nd ray (with metatarsal) Foot, Right ( M ) Complete 2nd Ray ( 5 ) Detachment ( 6 ) 0Y6M0Z5
Great Toe Disarticulation at MTP Joint First Toe, Left ( Q ) Complete ( 0 ) Detachment ( 6 ) 0Y6Q0Z0

BKA Stump Soft Tissue & Bone Debridement Subcut / Tibia Local debridement Excision ( B ) Select the exact soft-tissue body part and add 0QBG0ZZ only when right-tibial excision is documented