M35.8 — Other specified systemic involvement of connective tissue

Not billable

Is M35.8 billable?

No — M35.8 is a non-billable header code. M35.8 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 2 billable codes beneath M35.8.

Billable codes under this header

M35.8 at a glance

Code	M35.8
Description	Other specified systemic involvement of connective tissue
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes1 — never code together — inherited from M30-M36

The conditions below can never be reported together with M35.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

autoimmune disease, single organ or single cell-type -code to relevant condition category

Excludes1 — never code together — inherited from M35

The conditions below can never be reported together with M35.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

reactive perforating collagenosis (L87.1)

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M35.8, but a patient may have both at the same time. When documentation supports it, M35.8 and the excluded code may both be reported.

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)

What codes fall under M35.8? (2)

How long has M35.8 existed?

M35.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

FY2021: M35.8 stopped being billable

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.