Coding and coverage · ICD-10-CM

M35 Other systemic involvement of connective tissue

Not billable (header)Chapter 13

Report one of the more specific codes below.

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Codes under this one

  • M35.0 Sjogren syndromeHeader
  • M35.1 Other overlap syndromes
  • M35.2 Behcet's disease
  • M35.3 Polymyalgia rheumatica
  • M35.4 Diffuse (eosinophilic) fasciitis
  • M35.5 Multifocal fibrosclerosis
  • M35.6 Relapsing panniculitis [Weber-Christian]
  • M35.7 Hypermobility syndrome
  • M35.8 Other specified systemic involvement of connective tissueHeader
  • M35.9 Systemic involvement of connective tissue, unspecified

Instructional notes

Chapter 13

Excludes2Not included here: the patient may have both; report both when both are present.
  • 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
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Section M30-M36

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • autoimmune disease, single organ or single cell-type -code to relevant condition category
Includes
  • autoimmune disease NOS
  • collagen (vascular) disease NOS
  • systemic autoimmune disease
  • systemic collagen (vascular) disease

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • reactive perforating collagenosis (L87.1)

Chapter 13: Diseases of the musculoskeletal system and connective tissue · M30-M36 Systemic connective tissue disorders (M30-M36)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.