Musculoskeletal System: Bones, Joints, Fractures & Common Procedures - CPC Course Class - 4

 INTRODUCTION 

Welcome to Day 4 of the CPC Medical Coding Course!

In the previous classes, we learned the basics of medical coding, medical terminology, anatomy, body cavities, and body systems.

Today, we will study one of the most important systems for medical coding:

The Musculoskeletal System

We will cover:

• Overview of the musculoskeletal system
• Bones and their functions
• Types of bones
• Major bones of the body
• Joints and their types
• Common joint movements
• Fractures and fracture terminology
• Types of fractures
• Important fracture documentation
• Common musculoskeletal procedures
• Medical terminology related to bones and joints
• ICD-10-CM and CPT coding basics
• Coding tips for CPC students
• Practice questions

Human Anatomy and Physiology | Human body systems in medical coding | Nilesh Shende | Mcodertube

https://youtu.be/bziTwkYVovY

What Is the Musculoskeletal System?

The musculoskeletal system consists mainly of:

• Bones
• Joints
• Muscles
• Cartilage
• Ligaments
• Tendons
• Connective tissues

These structures work together to provide:

• Support
• Movement
• Protection
• Stability
• Body shape

Simple Example

When you walk:

• Bones provide the structure.
• Joints allow movement.
• Muscles contract to create movement.
• Tendons connect muscles to bones.
• Ligaments stabilize the joints.

All these structures work together.

Why Is the Musculoskeletal System Important for Medical Coders?

Medical coders frequently review documentation involving:

• Fractures
• Joint pain
• Arthritis
• Osteoporosis
• Back pain
• Sports injuries
• Tendon injuries
• Ligament injuries
• Joint replacement
• Fracture repair
• Arthroscopy
• Spinal procedures

Understanding anatomy helps the coder identify:

• Correct body part
• Laterality
• Specific location
• Type of injury
• Type of procedure

For example, there is a major difference between:

• Fracture of the femur
• Fracture of the tibia
• Fracture of the fibula

Even though all may involve the lower extremity, they are different bones and require different code selection.

PART 1: BONES

 What Are Bones?

Bones are hard connective tissues that form the body’s skeletal framework.

An adult human skeleton generally contains approximately 206 bones.

Bones are living tissues. They continuously undergo processes of:

• Growth
• Repair
• Remodeling

Functions of Bones

Bones perform several important functions.

1. Support

Bones provide a framework for the body.

For example:

The vertebral column supports the upper body.

2. Protection

Bones protect important internal organs.

Examples

• Skull → protects the brain
• Ribs → protect the heart and lungs
• Vertebral column → protects the spinal cord

3. Movement

Bones work with muscles and joints to create movement.

Example:

The femur, tibia, fibula, knee joint, and surrounding muscles work together when walking.

4. Mineral Storage

Bones store important minerals, especially:

• Calcium
• Phosphorus

5. Blood Cell Production

Certain bones contain bone marrow, where blood cells are produced.

This includes:

• Red blood cells
• White blood cells
• Platelets

Types of Bones

Bones are commonly classified according to their shape.

A. Long Bones

Long bones are longer than they are wide.

Examples

• Femur
• Humerus
• Tibia
• Fibula
• Radius
• Ulna

Example

The femur is the long bone located in the thigh.

B. Short Bones

Short bones are approximately equal in length and width.

Examples

• Carpals of the wrist
• Tarsals of the ankle

C. Flat Bones

Flat bones are generally thin and often provide protection.

Examples

• Skull bones
• Sternum
• Ribs
• Scapula

D. Irregular Bones

Irregular bones have complex shapes.

Examples

• Vertebrae
• Certain facial bones

E. Sesamoid Bones

Sesamoid bones develop within tendons.

Example

The patella, or kneecap, is the largest sesamoid bone.

Major Divisions of the Skeletal System

The skeletal system is commonly divided into two major parts.

1. Axial Skeleton

The axial skeleton forms the central axis of the body.

It includes:

• Skull
• Vertebral column
• Ribs
• Sternum

2. Appendicular Skeleton

The appendicular skeleton includes the bones associated with the limbs.

It includes:

Upper Extremities

• Shoulder
• Arm
• Forearm
• Wrist
• Hand

Lower Extremities

• Hip
• Thigh
• Leg
• Ankle
• Foot

 Major Bones of the Body

Skull

The skull protects the brain.

Clavicle

The clavicle is commonly called the collarbone.

Scapula

The scapula is commonly called the shoulder blade.

Sternum

The sternum is the breastbone located in the center of the chest.

Ribs

The ribs help protect:

• Heart
• Lungs

Vertebral Column

The vertebral column is commonly called the spine.

The main regions include:

• Cervical
• Thoracic
• Lumbar
• Sacral
• Coccygeal

Easy Way to Remember

Cervical → Neck

Thoracic → Chest

Lumbar → Lower back

Sacral → Pelvic region

Coccygeal → Tailbone

Upper Extremity Bones

The upper extremity includes:

Humerus

Located in the upper arm.

Radius

Located in the forearm.

It is on the thumb side when the palm faces forward.

Ulna

The other major bone of the forearm.

Carpals

Bones of the wrist.

Metacarpals

Bones of the hand.

Phalanges

Bones of the fingers.

Lower Extremity Bones

Femur

The femur is the thigh bone.

It is one of the largest and strongest bones in the body.

Patella

The patella is the kneecap.

Tibia

The tibia is the larger bone of the lower leg.

Fibula

The fibula is the smaller bone of the lower leg.

Tarsals

Bones of the ankle and rear portion of the foot.

Metatarsals

Bones of the foot.

Phalanges

Bones of the toes.

PART 2: JOINTS

What Is a Joint?

A joint is the location where two or more bones meet.

Joints allow different degrees of movement.

Examples include:

• Shoulder joint
• Elbow joint
• Wrist joint
• Hip joint
• Knee joint
• Ankle joint

Types of Joints

Joints can be classified based on the amount of movement they allow.

1. Fibrous Joints

Fibrous joints allow little or no movement.

Example

Certain joints between skull bones.

2. Cartilaginous Joints

These joints are connected by cartilage and allow limited movement.

3. Synovial Joints

Synovial joints allow significant movement.

These are very important in orthopedic coding.

Examples include:

• Shoulder
• Elbow
• Hip
• Knee

Common Types of Synovial Joints

Ball-and-Socket Joint

Allows movement in multiple directions.

Examples

• Shoulder
• Hip

Hinge Joint

Allows movement mainly in one plane.

Examples

• Elbow
• Knee

Pivot Joint

Allows rotational movement.

Saddle Joint

Allows movement in multiple directions.

An example is associated with the thumb.

Condyloid Joint

Allows movement in more than one direction.

Important Joint Structures

Cartilage

Cartilage covers and protects certain joint surfaces.

It helps reduce friction.

Ligament

A ligament connects:

Bone → Bone

Example

The ACL is a ligament associated with the knee.

Tendon

A tendon connects:

Muscle → Bone

Easy Memory Trick

Ligament = Bone to Bone

Tendon = Muscle to Bone

 Common Joint Movements

Understanding movement terminology is important when reviewing orthopedic documentation.

Flexion

Decreases the angle between body parts.

Example

Bending the elbow.

Extension

Increases the angle between body parts.

Example

Straightening the elbow.

Abduction

Movement away from the body’s midline.

Adduction

Movement toward the body’s midline.

Rotation

Movement around an axis.

Circumduction

Circular movement involving a combination of movements.

PART 3: FRACTURES

What Is a Fracture?

A fracture is a break or disruption in the continuity of a bone.

Fractures may occur because of:

• Falls
• Motor vehicle accidents
• Sports injuries
• Trauma
• Osteoporosis
• Other medical conditions

For medical coding, the exact documentation of the fracture is extremely important.

Common Types of Fractures

1. Closed Fracture

A closed fracture does not communicate with the outside environment through an open wound.

2. Open Fracture

An open fracture involves communication between the fracture site and the outside environment.

Open fractures require additional documentation and classification in appropriate coding situations.

3. Displaced Fracture

The bone fragments are not in normal alignment.

4. Nondisplaced Fracture

The bone fragments remain in normal or near-normal alignment.

5. Comminuted Fracture

The bone is broken into multiple pieces or fragments.

6. Transverse Fracture

The fracture line runs generally across the bone.

7. Oblique Fracture

The fracture line runs diagonally across the bone.

8. Spiral Fracture

The fracture has a twisting pattern.

9. Greenstick Fracture

A type of incomplete fracture commonly associated with children.

10. Stress Fracture

A fracture that may develop because of repetitive stress.

Important Fracture Documentation

For ICD-10-CM coding, a coder may need to review documentation for:

1. Bone involved

Example:

• Femur
• Tibia
• Radius

2. Specific location

Example:

• Proximal end
• Shaft
• Distal end

3. Laterality

Example:

• Right
• Left

4. Displacement

Example:

• Displaced
• Nondisplaced

5. Open or closed status

Documentation should be reviewed according to the applicable ICD-10-CM code requirements.

6. Encounter type

The coder must understand the applicable encounter character requirements.

Important concept:

Initial encounter does not simply mean the first calendar visit.

For injury coding, the appropriate encounter designation is based on the patient’s phase of treatment according to the official coding guidelines.

Initial, Subsequent, and Sequela

Initial Encounter

Generally associated with active treatment of the injury.

Examples of active treatment may include treatment such as:

• Surgical treatment
• Emergency treatment
• Evaluation and treatment by a new physician
• Other active management of the injury

Subsequent Encounter

Generally used during the healing or recovery phase after active treatment has been completed.

Sequela

A sequela refers to a residual condition resulting from a previous injury.

Simple Example

A patient had an old injury and now has a lasting complication related to that injury.

The coder must follow the applicable ICD-10-CM injury coding guidelines.

PART 4: COMMON MUSCULOSKELETAL PROCEDURES

What Are Common Musculoskeletal Procedures?

Medical coders may encounter procedures involving:

• Bones
• Joints
• Muscles
• Tendons
• Ligaments
• Spine

Let’s understand some common terms.

Closed Reduction

A reduction is performed to restore the alignment of a fracture or dislocation.

A closed reduction is performed without surgically opening the fracture site.

Example

A patient has a displaced fracture, and the physician manipulates the bone to restore alignment without making a surgical incision.

Open Reduction

An open reduction involves surgically exposing the fracture site to restore alignment.

Internal Fixation

Internal fixation uses devices placed inside the body to stabilize the bone.

Examples may include:

• Plates
• Screws
• Rods
• Nails

ORIF

ORIF means:

Open Reduction Internal Fixation

Let’s break it down.

Open Reduction

The fracture is surgically exposed and aligned.

Internal Fixation

Internal devices are used to stabilize the fracture.

Example

A patient has a displaced femoral fracture.

The surgeon:

1. Opens the surgical site.
2. Aligns the fractured bone.
3. Uses internal fixation devices.

This is commonly described as ORIF.

External Fixation

External fixation involves a stabilizing device that is positioned outside the body and connected to the bone using pins or other components.

Arthroscopy

Let’s break down the word.

Arthr = Joint

-scopy = Visual examination

Arthroscopy involves visualization of a joint using an arthroscope.

It may be performed for diagnostic or therapeutic purposes.

Common Areas

• Knee
• Shoulder

Arthroplasty

Let’s break down the word.

Arthr = Joint

-plasty = Surgical repair or reconstruction

Arthroplasty refers to surgical repair or reconstruction of a joint.

Joint replacement procedures are commonly associated with arthroplasty terminology.

Joint Replacement

A damaged joint may be partially or completely replaced.

Examples include:

• Hip replacement
• Knee replacement
• Shoulder replacement

Documentation must be reviewed carefully to determine the exact procedure performed.

Arthrodesis

Arthrodesis means surgical fusion of a joint.

Example

Spinal fusion is a common example involving fusion procedures.

Osteotomy

Let’s break down the term.

Oste = Bone

-otomy = Cutting or incision

An osteotomy involves cutting or dividing bone as part of a surgical procedure.

Laminectomy

A laminectomy is a procedure involving removal of part of a vertebra known as the lamina.

It may be performed in appropriate spinal conditions based on the documented procedure.

Tendon Repair

Tendons may be repaired following:

• Trauma
• Rupture
• Laceration

Remember:

Tendon connects muscle to bone.

Ligament Repair or Reconstruction

Ligaments may be repaired or reconstructed following injury.

Example

ACL reconstruction is associated with reconstruction of a knee ligament.

PART 5: IMPORTANT MEDICAL TERMINOLOGY

Common Bone and Joint Terms

Medical Term	Meaning
Osteitis	Inflammation of bone
Osteoporosis	Condition involving reduced bone strength/density
Osteoarthritis	Degenerative joint disease
Arthritis	Inflammation of a joint
Arthralgia	Joint pain
Myalgia	Muscle pain
Myopathy	Muscle disease
Tendinitis/Tendinopathy	Tendon-related condition
Bursitis	Inflammation of a bursa
Scoliosis	Abnormal curvature of the spine
Kyphosis	Excessive curvature of the upper spine
Lordosis	Increased inward curvature of the spine

Important Prefixes for Musculoskeletal Coding

Prefix	Meaning	Example
Osteo-	Bone	Osteoporosis
Arthro-	Joint	Arthritis
Myo-	Muscle	Myalgia
Chondro-	Cartilage	Chondritis
Spondylo-	Vertebra	Spondylosis
Burs-	Bursa	Bursitis

Important Suffixes

Suffix	Meaning
-itis	Inflammation
-algia	Pain
-ectomy	Surgical removal
-otomy	Incision/cutting
-plasty	Repair/reconstruction
-scopy	Visual examination
-desis	Binding/fusion
-pathy	Disease

PART 6: ICD-10-CM CODING BASICS

Musculoskeletal ICD-10-CM Coding

When coding musculoskeletal conditions, always review:

1. Provider documentation
2. Anatomical site
3. Laterality
4. Type of condition
5. Specificity
6. Applicable coding guidelines
7. Alphabetic Index
8. Tabular List

Never select a code only because you recognize the medical term.

Simple Fracture Coding Example

Provider documentation:

Nondisplaced fracture of a specified bone of the right lower extremity.

Before selecting the code, the coder should identify:

• Which bone?
• Which part of the bone?
• Right or left?
• Displaced or nondisplaced?
• Open or closed, if applicable?
• Encounter type?
• Any additional classification required?

The final code must be verified in the current ICD-10-CM code set.

PART 7: CPT CODING BASICS FOR MUSCULOSKELETAL PROCEDURES

CPT coding for orthopedic and musculoskeletal procedures depends on the exact service performed.

The coder should review:

• Procedure description
• Anatomical site
• Surgical technique
• Approach
• Laterality
• Whether imaging guidance was used
• Whether the procedure was open or closed
• Whether implants were placed
• CPT instructional notes

Common Procedure Categories You May See

Examples include:

• Fracture treatment
• Joint arthroscopy
• Arthroplasty
• Joint replacement
• Tendon repair
• Ligament reconstruction
• Bone excision
• Spinal surgery

Always select the CPT code based on the actual procedure documented—not simply the procedure name mentioned in the medical record.

Difference Between Important Procedures

Procedure	Basic Meaning
Reduction	Restoring alignment
Closed reduction	Alignment without surgical opening
Open reduction	Surgical exposure and alignment
Internal fixation	Device placed inside the body
External fixation	Stabilizing device outside the body
ORIF	Open reduction + internal fixation
Arthroscopy	Visual examination/treatment using scope
Arthroplasty	Joint repair/reconstruction
Arthrodesis	Surgical fusion
Osteotomy	Cutting/dividing bone

Important Tips for CPC Students

As a beginner, do not try to memorize every bone, procedure, and condition at once.

Follow this method:

Step 1: Learn Anatomy

Identify the body part.

Step 2: Understand Medical Terminology

Break down the medical word.

Step 3: Read Provider Documentation

Understand the diagnosis or procedure.

Step 4: Identify Specific Details

Check:

• Site
• Laterality
• Type of injury
• Type of procedure

Step 5: Verify the Code

Use the appropriate current-year coding resources and guidelines.