N61.0 Mastitis without abscess

Billable ICD-10-CM code, FY2026.

Applicable to

• Infective mastitis (acute) (nonpuerperal) (subacute)
• Mastitis (acute) (nonpuerperal) (subacute) NOS
• Cellulitis (acute) (nonpuerperal) (subacute) of breast NOS
• Cellulitis (acute) (nonpuerperal) (subacute) of nipple NOS

Applies from N61 Inflammatory disorders of breast

Excludes1 (never code together)

• inflammatory carcinoma of breast (C50.A-)
• inflammatory disorder of breast associated with childbirth (O91.-)
• neonatal infective mastitis (P39.0)
• thrombophlebitis of breast [Mondor's disease] (I80.8)

MS-DRG index

Defines the logic of DRG(s) 600-601 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 611.0 Inflammatory disease of breast (approximate)

Code annotations containing back-references to N61.0

Back-references to N61.0

• Type 2 Excludes: L03.31 Cellulitis of trunk ("cellulitis of breast NOS (N61.0)")

Diagnosis Index entries for N61.0

• Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) › breast (acute) (nonpuerperal) (subacute)
• Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) › breast (acute) (nonpuerperal) (subacute) › nipple
• Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) › nipple (acute) (nonpuerperal) (subacute)
• Fistula (cutaneous) › breast
• Fistula (cutaneous) › mammary (gland)
• Galactophoritis
• Infection, infected, infective (opportunistic) › mammary gland
• Infection, infected, infective (opportunistic) › nipple
• Inflammation, inflamed, inflammatory (with exudation) › areola
• Inflammation, inflamed, inflammatory (with exudation) › breast
• Inflammation, inflamed, inflammatory (with exudation) › nipple
• Mammillitis
• Mastitis (acute) (diffuse) (nonpuerperal) (subacute)
• Mastitis (acute) (diffuse) (nonpuerperal) (subacute) › infective
• Mastitis (acute) (diffuse) (nonpuerperal) (subacute) › without abscess
• Thelitis

Nearby codes

• N61 Inflammatory disorders of breast
• N61.0 Mastitis without abscess (this code)
• N61.1 Abscess of the breast and nipple
• N61.2 Granulomatous mastitis
• N61.20 Granulomatous mastitis, unspecified breast
• N61.21 Granulomatous mastitis, right breast
• N61.22 Granulomatous mastitis, left breast