O91.21
Non-billableNonpurulent mastitis associated with pregnancy
O91.21 is the ICD-10-CM code for Nonpurulent mastitis associated with pregnancy. It is a non-billable category code — use a more specific child code such as O91.211 for billing.
O00-O9A Pregnancy, childbirth and the puerperium
Includes
- •Gestational interstitial mastitis
- •Gestational lymphangitis of breast
- •Gestational mastitis NOS
- •Gestational parenchymatous mastitis
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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