1. Mary Jo Bowie MS, BS, AAS, RHIA, RHIT

2. Diseases of the Musculoskeletal System and Connective Tissue
CHAPTER 18
Diseases of the Musculoskeletal System and Connective Tissue

3. Diseases of the Musculoskeletal System and Connective Tissue—Code Range M00-M99
Diseases of the musculoskeletal system and connective tissue are reported from Chapter 13 of ICD-10-CM.
This chapter contains codes for diseases of the musculoskeletal system and connective tissues. Injuries are classified to Chapter 19 of ICD-10-CM.

4. Human Skeleton
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5. Major Muscles of the Body—Anterior View
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6. Major Muscles of the Body—Posterior View
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7. Arthropathies—M00-M25 This block of codes reports:
Infectious arthropathies—M00-M02
Inflammatory polyarthropathies—M05-M14
Osteoarthritis—M15-M19
Other joint disorders—M20-M25
Site and laterality are identified in the codes.

8. Dentofacial Anomalies and Other Disorders of Jaw—M26-M27
This block of code also reports malocclusion.
Disorders reported here include:
Major anomalies of jaw size
Anomalies of dental arch and tooth position
Dentofacial functional abnormalities
Developmental disorders of jaws
Cysts of jaw
Dental implant failures

9. Systemic Connective Tissue Disorders—M30-M36
This block of codes includes autoimmune
disease, collagen disease, systemic
autoimmune disease, and systemic
collagen disease.
This block of codes exclude autoimmune
disease, single organ, or single cell-type.
Coders should be guided by instructional notation
that appears at the start of the block of codes.

10. Deforming Dorsopathies—M40-M43
The categories here include:
M40—Kyphosis and lordosis
M41—Scoliosis
M42—Spinal osteochondrosis
M43—Other deforming dorsopathies including spondylolysis, spondylolisthesis, fusion of spine, and dislocations

11. Spondylopathies—M45-M49 These categories report:
Ankylosing spondylitis
Other inflammatory spondylopathies
Spondylosis
Spondylopathies, including spinal stenosis, kissing spine, stress fracture of vertebra

12. Other Dorsopathies—M50-M54
These categories report:
Cervical disc disorders
Thoracic, thoracolumbar, and lumbosacral intervertebral disc disorders
Dorsalgia
Radiculopathy
Cervicalgia
Sciatica, lumbago with sciatica, low back pain

13. Soft Tissue Disorders—M60-M79
This block reports:
Disorders of muscles—M60-M63
Disorders of synovium and tendon—M65-M67
Other soft tissue disorders—M70-M79, including bursitis, bursopathies, myalgia, neuralgia, neuritis, and fibromyalgia

14. Disorders of Bone Density and Structure—M80-M85
This block reports:
Osteoporosis with current pathological fracture
Osteoporosis without current pathological fracture
Adult osteomalacia
Stress fracture
Pathological fracture

15. Other Osteopathies—M86-M90
This block includes:
Osteomyelitis
Osteonecrosis
Osteitis deformans—Paget’s disease of bone
Other disorders including arrest of bone growth plate, hypertropyhy of bone, osteolysis
Osteopathies in diseases classified elsewhere

16. Chondropathies—M91-M94 This block includes:
Juvenile osteochondrosis of hip and pelvis
Other juvenile osteochondrosis
Other osteochondropathies
Other disorders of cartilage

17. Remaining Categories
M95—Other acquired deformities of the musculoskeletal system and connective tissue
M96—Intraoperative and postprocedural complications and disorders of the musculoskeletal system NEC
M99—Biomechanical lesions NEC

18. Official Guidelines for Coding and Reporitng
The Official Guidelines address:
Site and laterality
Acute traumatic versus chronic or recurrent musculoskeletal conditions
Coding of pathologic fractures
Osteoporosis

19. Coding Practice Select the code for the following:
Pneumococcal arthritis of left shoulder

20. Coding Practice Solution
Main term to reference in index:
Arthritis
Modifying term:
Pneumococcal, then shoulder
Code Assignment:
M00.112