All ICD10 Codes
O91Not billable, use a more specific code below

Infections of breast associated with pregnancy, the puerperium and lactation

In Complications predominantly related to the puerperium (O85-O92), chapter 15: Pregnancy, Childbirth and the Puerperium

18 billable codes under O91: none are a CC or MCC; none map to an HCC.

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Instructional notes

Use additional code: add a second code for this, listed after this one

  • code to identify infection

Also applies, from Complications predominantly related to the puerperium (O85-O92)

These notes sit on O85-O92 and apply to every code under it, including O91.

Excludes2: not included here, code separately if applicable

  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • puerperal osteomalacia (M83.0)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Coding of obstetric cases with O00-O9A codes: sequencing priority, trimester and fetus characters, principal diagnosis selection, delivery outcome, and pregnancy-related complications.

Read Section I.C.15 (page 63), 11 more topics

All codes under O91

O91 can't be used on a claim. Pick a billable code below; grey headings group them.

O91 MS-DRGs

As the principal diagnosis, the billable codes under O91 group to these 8 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to O91

Notes on these codes point to O91.

  • N60-N65 Excludes1: disorders of breast associated with childbirth (O91-O92)
  • N61 Excludes1: inflammatory disorder of breast associated with childbirth (O91.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Breast Diseases

Breast diseases include various conditions and changes in your breast. Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges of fluids that are not breast milk.

Read more about breast diseases on MedlinePlus

Breastfeeding

Breastfeeding offers many benefits to your baby. Breast milk contains the right balance of nutrients to help your infant grow into a strong and healthy toddler. Some of the nutrients in breast milk also help protect your infant against some common childhood illnesses and infections. It may also help your health. Certain types of cancer may occur less often in mothers who have breastfed their babies.

Read more about breastfeeding on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.