| M3509 | Sjogren syndrome with other organ involvement |
| M350A | Sjogren syndrome with glomerular disease |
| M350B | Sjogren syndrome with vasculitis |
| M350C | Sjogren syndrome with dental involvement |
| M351 | Other overlap syndromes |
| M352 | Behcet's disease |
| M353 | Polymyalgia rheumatica |
| M354 | Diffuse (eosinophilic) fasciitis |
| M355 | Multifocal fibrosclerosis |
| M356 | Relapsing panniculitis [Weber-Christian] |
| M357 | Hypermobility syndrome |
| M358 | Other specified systemic involvement of connective tissue |
| M3581 | Multisystem inflammatory syndrome |
| M3589 | Other specified systemic involvement of connective tissue |
| M359 | Systemic involvement of connective tissue, unspecified |
| M36 | Systemic disorders of connective tissue in diseases classified elsewhere |
| M360 | Dermato(poly)myositis in neoplastic disease |
| M361 | Arthropathy in neoplastic disease |
| M362 | Hemophilic arthropathy |
| M363 | Arthropathy in other blood disorders |
| M364 | Arthropathy in hypersensitivity reactions classified elsewhere |
| M368 | Systemic disorders of connective tissue in other diseases classified elsewhere |
| M40 | Kyphosis and lordosis |
| M400 | Postural kyphosis |
| M4000 | Postural kyphosis, site unspecified |
| M4003 | Postural kyphosis, cervicothoracic region |
| M4004 | Postural kyphosis, thoracic region |
| M4005 | Postural kyphosis, thoracolumbar region |
| M401 | Other secondary kyphosis |
| M4010 | Other secondary kyphosis, site unspecified |
| M4012 | Other secondary kyphosis, cervical region |
| M4013 | Other secondary kyphosis, cervicothoracic region |
| M4014 | Other secondary kyphosis, thoracic region |
| M4015 | Other secondary kyphosis, thoracolumbar region |
| M402 | Other and unspecified kyphosis |
| M4020 | Unspecified kyphosis |
| M40202 | Unspecified kyphosis, cervical region |
| M40203 | Unspecified kyphosis, cervicothoracic region |
| M40204 | Unspecified kyphosis, thoracic region |
| M40205 | Unspecified kyphosis, thoracolumbar region |
| M40209 | Unspecified kyphosis, site unspecified |
| M4029 | Other kyphosis |
| M40292 | Other kyphosis, cervical region |
| M40293 | Other kyphosis, cervicothoracic region |
| M40294 | Other kyphosis, thoracic region |
| M40295 | Other kyphosis, thoracolumbar region |
| M40299 | Other kyphosis, site unspecified |
| M403 | Flatback syndrome |
| M4030 | Flatback syndrome, site unspecified |
| M4035 | Flatback syndrome, thoracolumbar region |