🦴 Chapter 13 · M00-M99

Bones & Muscles Diagnosis Codes

Musculoskeletal codes are extremely common, covering back pain, arthritis, osteoporosis, joint disorders, and soft tissue conditions. Back pain codes alone account for millions of doctor visits annually, making this one of the most frequently referenced chapters.

About This Chapter

Chapter 13 of the ICD-10-CM classification covers diseases of the musculoskeletal system and connective tissue, spanning codes M00-M99. These codes are used by healthcare providers to document diagnoses in your electronic health record (EHR), on insurance claims, and on medical bills.

Why this matters: If you see a code starting with M on your medical bill or health records, it likely falls in this chapter. Understanding what chapter your code belongs to can help you make sense of your diagnosis and ask better questions at your next appointment.

Diagnosis Codes in This Chapter

Browse the 18 diagnosis codes we currently cover in this chapter. Select any code to read a plain-English explanation.

M05.79Rheumatoid Arthritis with Rheumatoid Facto... M06.9Rheumatoid Arthritis, Unspecified... M15Polyosteoarthritis M16.9Osteoarthritis of Hip M17.9Osteoarthritis of Knee M19.90Osteoarthritis, Unspecified M25.561Pain in Right Knee M25.562Pain in Left Knee M32.9Systemic Lupus Erythematosus M47.816Cervical Spondylosis M54.2Cervicalgia (Neck Pain) M54.5Low Back Pain M54.9Back Pain, Unspecified M62.81Muscle Weakness M79.1Myalgia (Muscle Pain) M79.3Panniculitis M79.89Soft Tissue Disorder M81.0Age-Related Osteoporosis