O91.21

Non-billable

Nonpurulent 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.

Status
Header (non-billable)
Chapter
O00-O9A
Parent
O91.2
Subcodes
4
Edition
FY2026

O00-O9A Pregnancy, childbirth and the puerperium

Includes

  • Gestational interstitial mastitis
  • Gestational lymphangitis of breast
  • Gestational mastitis NOS
  • Gestational parenchymatous mastitis

Frequently asked questions

What is ICD-10 code O91.21?
O91.21 is the ICD-10-CM code for "Nonpurulent mastitis associated with pregnancy". It falls under O00-O9A Pregnancy, childbirth and the puerperium.
Is O91.21 a billable code?
No — O91.21 is a non-billable header code. Use a more specific child code (such as O91.211) for billing.
What are the subcodes of O91.21?
O91.21 has 4 more specific child codes, including O91.211, O91.212, O91.213.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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