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Home/Diagnosis/ICD-10 Coding for Connective Tissue Disorder

ICD-10 Coding for Connective Tissue Disorder

M35.9
M35.1

Complete ICD-10-CM coding and documentation guide for icd-10 coding for connective tissue disorder includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Autoimmune Connective Tissue Disorder
Mixed Connective Tissue Disease
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Key Information: ICD-10 Coding for Connective Tissue Disorder

Essential facts and insights about ICD-10 Coding for Connective Tissue Disorder

Use ICD-10 code M35.9 for systemic involvement of connective tissue, unspecified, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Systemic involvement of connective tissue, unspecified

Billable Code
M35.9
Billable

Diagnostic Criteria

clinical_criteria:
  • • Lack of specific serologic markers or clinical criteria for a more specific diagnosis.

Applicable To

  • • Autoimmune connective tissue disorder NOS

Important Notes

  • • Ensure documentation supports the use of unspecified codes by confirming the absence of specific diagnostic criteria.

Mixed connective tissue disease

Billable Code
M35.1
Billable

Diagnostic Criteria

clinical_criteria:
  • • Positive anti-U1 RNP antibody
  • • Clinical overlap features such as Raynaud’s phenomenon, synovitis

Applicable To

  • • Presence of anti-U1 RNP antibodies

Important Notes

  • • Ensure documentation includes specific serologic and clinical criteria to support the diagnosis.
Ancillary Codes

Additional codes that may be used with this diagnosis

I27.0

Pulmonary hypertension secondary to connective tissue disease

Use when pulmonary hypertension is a complication of the connective tissue disorder.

J84.9

Interstitial lung disease, unspecified

Use when lung involvement is present.

Frequently Asked Questions

What is the ICD-10 code for connective tissue disorder?

The ICD-10 code for an unspecified connective tissue disorder is M35.9. For mixed connective tissue disease, use M35.1 when specific serologic markers are present.

How do you code mixed connective tissue disease?

Code mixed connective tissue disease as M35.1 when there is evidence of anti-U1 RNP antibodies and clinical overlap features.

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