O91.21 Nonpurulent mastitis associated with pregnancy

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Nonpurulent mastitis associated with pregnancy is O91.21 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
O85-O92: Complications predominantly related to the puerperium (O85-O92)
Category O91
25 codes (18 billable)
FY2026 Status
Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to O91.21:

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

Inclusion Terms

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

References

Related Codes

Parent Code

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

More Specific Codes

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

Related Codes in O91

O91 Infections of breast associated with pregnancy, the puerperium and lactation O91.0 Infection of nipple associated with pregnancy, the puerperium and lactation O91.01 Infection of nipple associated with pregnancy O91.011 Infection of nipple associated with pregnancy, first trimester O91.012 Infection of nipple associated with pregnancy, second trimester O91.013 Infection of nipple associated with pregnancy, third trimester O91.019 Infection of nipple associated with pregnancy, unspecified trimester O91.02 Infection of nipple associated with the puerperium O91.03 Infection of nipple associated with lactation O91.1 Abscess of breast associated with pregnancy, the puerperium and lactation O91.11 Abscess of breast associated with pregnancy O91.111 Abscess of breast associated with pregnancy, first trimester O91.112 Abscess of breast associated with pregnancy, second trimester 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 O91.211 Nonpurulent mastitis associated with pregnancy, first trimester O91.212 Nonpurulent mastitis associated with pregnancy, second trimester
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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