FY2027
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ICD-10 Code for Mastitis

Also indexed as (acute) (diffuse) (nonpuerperal) (subacute)

The ICD-10-CM code for mastitis is N61.0 — Mastitis without abscess. This is the code the Alphabetic Index gives for mastitis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).

Billable

Which mastitis code should you use?

The Alphabetic Index lists 11 codes under Mastitis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.

By type

with abscessN61.1Abscess of the breast and nipple
granulomatousN61.2Not billableGranulomatous mastitis
infectiveN61.0Mastitis without abscess
neonatalP83.4Breast engorgement of newborn
without abscessN61.0Mastitis without abscess

Mastitis infective

newbornP39.0Neonatal infective mastitis

Mastitis neonatal

infectiveP39.0Neonatal infective mastitis

Mastitis obstetric

associated with › lactationO91.23Nonpurulent mastitis associated with lactation
associated with › pregnancyO91.21Not billableNonpurulent mastitis associated with pregnancy
associated with › puerperiumO91.22Nonpurulent mastitis associated with the puerperium
purulent › associated with › lactationO91.13Abscess of breast associated with lactation
purulent › associated with › pregnancyO91.11Not billableAbscess of breast associated with pregnancy
purulent › associated with › puerperiumO91.12Abscess of breast associated with the puerperium

Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources