Non-Billable / Non-Specific Code
ICD-10-CM M35 is the diagnosis code for Other systemic involvement of connective tissue. This code falls under the section "Systemic connective tissue disorders" within Chapter 13 — Diseases of the musculoskeletal system and connective tissue (M00-M99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as M35. They are mutually exclusive:
Understanding where M35 sits in the ICD-10-CM classification helps ensure proper coding:
No, M35 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
M35 is the ICD-10-CM diagnosis code for "Other systemic involvement of connective tissue". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
M35 is located in Section M30-M36 — "Systemic connective tissue disorders" within Chapter 13 of the ICD-10-CM Tabular List.
M35 has 10 sub-code(s) that provide more specific detail: M35.0, M35.1, M35.2, M35.3, M35.4 and more.
Use M35 when the patients documented diagnosis matches "Other systemic involvement of connective tissue" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Other systemic involvement of connective tissue is M35.
No, M35 is non-billable. Use a more specific sub-code for primary diagnosis billing.
M35 is in Chapter 13 of the ICD-10-CM Tabular List.
Type 1 Excludes for M35 include: reactive perforating collagenosis (L87.1).
Yes, M35 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.