Chapter 13: Diseases of the musculoskeletal system and connective tissue
M00-M99
Chapter 13 of the ICD-10-CM tabular list covers diseases of the musculoskeletal system and connective tissue, codes M00-M99. It holds 8,674 codes across 10 blocks, of which 6,665 are billable and 2,009 are header codes that cannot go on a claim. 2,030 (23%) require a 7th character.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
Additional guidance from the ICD-10-CM tabular list.
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Risk adjustment in Chapter 13
1,202 of this chapter’s codes map to a CMS-HCC, which means the diagnosis carries a risk-adjustment payment when it is documented and coded to the level the record supports.
- HCC 92 Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
- HCC 93 Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
- HCC 94 Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders
- HCC 402 Hip Fracture/Dislocation
- HCC 401 Vertebral Fractures without Spinal Cord Injury
- HCC 280 Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders
Blocks in this chapter
- M00-M25Arthropathies3,091 codes
- M26-M27Dentofacial anomalies [including malocclusion] and other disorders of jaw115 codes
- M30-M36Systemic connective tissue disorders101 codes
- M40-M54Dorsopathies667 codes
- M60-M79Soft tissue disorders1,530 codes
- M80-M94Osteopathies and chondropathies2,955 codes
- M95Other disorders of the musculoskeletal system and connective tissue12 codes
- M96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified48 codes
- M97Periprosthetic fracture around internal prosthetic joint54 codes
- M99Biomechanical lesions, not elsewhere classified101 codes