ICD10 code of Granulomatous Mastitis and ICD9 code

The primary ICD-10 code for Idiopathic Granulomatous Mastitis is N60.89 (Other specified benign mammary dysplasias), while the historical ICD-9 code most commonly used for this condition is 611.79. Because Granulomatous Mastitis is a rare, chronic inflammatory breast condition, these codes are used for documentation and billing despite the disease's complex, non-malignant nature.

What is the clinical nature of Granulomatous Mastitis?

Granulomatous Mastitis is a rare, chronic inflammatory disorder of the breast that often mimics breast cancer or breast abscesses. Clinically, patients with Granulomatous Mastitis may present with a tender, firm, or erythematous breast mass, often accompanied by skin ulceration or sinus tract formation. With 74 members currently sharing their experiences on DiseaseMaps.org, we recognize the significant diagnostic journey these patients face, as the disease is often misdiagnosed as bacterial mastitis or malignancy.

How is Granulomatous Mastitis diagnosed?

Diagnosis of Granulomatous Mastitis is typically confirmed through a core needle biopsy, which reveals non-caseating granulomatous inflammation in the breast lobules. Because the etiology of Granulomatous Mastitis remains largely idiopathic, physicians must perform a thorough workup to rule out other causes, including:

• Tuberculosis and other mycobacterial infections


• Sarcoidosis


• Fungal infections


• Autoimmune-related vasculitis


• Duct ectasia

Is Granulomatous Mastitis considered a chronic condition?

Yes, Granulomatous Mastitis is frequently characterized by a prolonged and relapsing course. Treatment often involves a multidisciplinary approach, including corticosteroids, immunosuppressants, or surgical excision. Due to the high recurrence rate of Granulomatous Mastitis, long-term monitoring by a breast specialist or rheumatologist is often required to manage persistent inflammation and the psychological impact of living with a visible, painful breast condition.

Next steps

• Consult with a breast surgeon or a specialist physician familiar with inflammatory breast disease.


• Request a biopsy to confirm a diagnosis and rule out mimics of Granulomatous Mastitis.


• Join the community of 74+ patients on DiseaseMaps.org to share experiences and coping strategies.


• Keep a symptom diary to track flare-ups and treatment responses for your medical team.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Granulomatous Mastitis overview.


• Orphanet: Rare disease database for inflammatory breast conditions.


• PubMed/NCBI: Clinical review of the diagnostic criteria for Idiopathic Granulomatous Mastitis.


• World Health Organization (WHO): International Classification of Diseases (ICD-10/11) coding guidelines.