Billable / Specific Code
ICD-10-CM M35.9 is the diagnosis code for Systemic involvement of connective tissue, unspecified. 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 billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where M35.9 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M35.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M35.9 is the ICD-10-CM diagnosis code for "Systemic involvement of connective tissue, unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M35.9 is M35 ("Other systemic involvement of connective tissue"). M35.9 provides a more specific classification within this category.
M35.9 is located in Section M30-M36 — "Systemic connective tissue disorders" within Chapter 13 of the ICD-10-CM Tabular List.
Use M35.9 when the patients documented diagnosis matches "Systemic involvement of connective tissue, unspecified" 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 Systemic involvement of connective tissue, unspecified is M35.9.
Yes, M35.9 can be used as a primary diagnosis code since it is billable and specific.
M35.9 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M35.9 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.