O91.21 Nonpurulent mastitis associated with pregnancy

Non-billable header with 4 child codes.

Applicable to

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

Applies from O91 Infections of breast associated with pregnancy, the puerperium and lactation

Use additional code

• code to identify infection

Codes under O91.21

• O91.211 Nonpurulent mastitis associated with pregnancy, first trimester
• O91.212 Nonpurulent mastitis associated with pregnancy, second trimester
• O91.213 Nonpurulent mastitis associated with pregnancy, third trimester
• O91.219 Nonpurulent mastitis associated with pregnancy, unspecified trimester

Code annotations containing back-references to O91.21

Back-references to O91.2

• Type 2 Excludes: L03.31 Cellulitis of trunk ("puerperal cellulitis of breast (O91.2)")

Back-references to O91

• Type 1 Excludes: N61 Inflammatory disorders of breast ("inflammatory disorder of breast associated with childbirth (O91.-)")

Diagnosis Index entries for O91.21

• Mastitis (acute) (diffuse) (nonpuerperal) (subacute) › obstetric (interstitial) (nonpurulent) › associated with › pregnancy

Nearby codes

• O91.113 Abscess of breast associated with pregnancy, third trimester
• O91.119 Abscess of breast associated with pregnancy, unspecified trimester
• O91.12 Abscess of breast associated with the puerperium
• O91.13 Abscess of breast associated with lactation
• O91.2 Nonpurulent mastitis associated with pregnancy, the puerperium and lactation
• O91.21 Nonpurulent mastitis associated with pregnancy (this code)
• O91.211 Nonpurulent mastitis associated with pregnancy, first trimester
• O91.212 Nonpurulent mastitis associated with pregnancy, second trimester
• O91.213 Nonpurulent mastitis associated with pregnancy, third trimester
• O91.219 Nonpurulent mastitis associated with pregnancy, unspecified trimester
• O91.22 Nonpurulent mastitis associated with the puerperium